{"kind": "protocol", "major": "18", "item": {"slug": "logical-relation", "name": "Relation (logical replication)", "name_zh": "", "category": "Logical replication formats", "summary": "Logical replication Relation format. Identifies the message as a relation message.", "aliases": ["Relation"], "content_hash": "8de3e5c48a9047bf2cfc3c66cacd64afd0aa27b55de8dcce20975dd6f50ebfec", "versions": {"10": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32", "c2": "ID of the relation."}, {"c0": "3", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "4", "c1": "String", "c2": "Relation name."}, {"c0": "5", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "6", "c1": "Int16", "c2": "Number of columns."}, {"c0": "7", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "8", "c1": "String", "c2": "Name of the column."}, {"c0": "9", "c1": "Int32", "c2": "ID of the column's data type."}, {"c0": "10", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/10/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=10", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v10.23/postgresql-10.23.tar.bz2", "label": "10.23", "major": "10", "channel": "stable", "revision": "94a4b2528372458e5662c18d406629266667c437198160a18cdfd2c4a4d6eee9"}, "sources": [{"url": "/docs/10/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 10 English manual", "sha256": "d59789e57fb3bfca55c805338f0883d2569b3a32490546294e2b60f3d8cd6d64"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are returned either by the replication slot SQL interface or are sent by a walsender. In case of a walsender they are encapsulated inside the replication protocol WAL messages as described in Section 52.4 and generally obey same message flow as physical replication. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32
\n
\n

ID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column:

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32
\n
\n

ID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/10/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "579415e1a22e07102829a64c1e2dcb8d06d603318b2f4649bb60e3a702665ba3"}, "11": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32", "c2": "ID of the relation."}, {"c0": "3", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "4", "c1": "String", "c2": "Relation name."}, {"c0": "5", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "6", "c1": "Int16", "c2": "Number of columns."}, {"c0": "7", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "8", "c1": "String", "c2": "Name of the column."}, {"c0": "9", "c1": "Int32", "c2": "ID of the column's data type."}, {"c0": "10", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/11/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=11", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v11.22/postgresql-11.22.tar.bz2", "label": "11.22", "major": "11", "channel": "stable", "revision": "2cb7c97d7a0d7278851bbc9c61f467b69c094c72b81740b751108e7892ebe1f0"}, "sources": [{"url": "/docs/11/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 11 English manual", "sha256": "398afd7945b4d61facda275c78067baa3f49d65bfd2ca840fbe3074533403b62"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are returned either by the replication slot SQL interface or are sent by a walsender. In case of a walsender they are encapsulated inside the replication protocol WAL messages as described in Section 53.4 and generally obey same message flow as physical replication. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32
\n
\n

ID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column:

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32
\n
\n

ID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/11/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "579415e1a22e07102829a64c1e2dcb8d06d603318b2f4649bb60e3a702665ba3"}, "12": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32", "c2": "ID of the relation."}, {"c0": "3", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "4", "c1": "String", "c2": "Relation name."}, {"c0": "5", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "6", "c1": "Int16", "c2": "Number of columns."}, {"c0": "7", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "8", "c1": "String", "c2": "Name of the column."}, {"c0": "9", "c1": "Int32", "c2": "ID of the column's data type."}, {"c0": "10", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/12/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=12", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v12.22/postgresql-12.22.tar.bz2", "label": "12.22", "major": "12", "channel": "stable", "revision": "8df3c0474782589d3c6f374b5133b1bd14d168086edbc13c6e72e67dd4527a3b"}, "sources": [{"url": "/docs/12/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 12 English manual", "sha256": "8c2e615799c7af869e31164cdf7d82d5ec7526abfe0ec84a35c4553bc8b2e9dc"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are returned either by the replication slot SQL interface or are sent by a walsender. In case of a walsender they are encapsulated inside the replication protocol WAL messages as described in Section 52.4 and generally obey same message flow as physical replication. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32
\n
\n

ID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column (except generated columns):

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32
\n
\n

ID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/12/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "579415e1a22e07102829a64c1e2dcb8d06d603318b2f4649bb60e3a702665ba3"}, "13": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32", "c2": "ID of the relation."}, {"c0": "3", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "4", "c1": "String", "c2": "Relation name."}, {"c0": "5", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "6", "c1": "Int16", "c2": "Number of columns."}, {"c0": "7", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "8", "c1": "String", "c2": "Name of the column."}, {"c0": "9", "c1": "Int32", "c2": "ID of the column's data type."}, {"c0": "10", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/13/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=13", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v13.23/postgresql-13.23.tar.bz2", "label": "13.23", "major": "13", "channel": "stable", "revision": "6ec3c82726af92b7dec873fa1cdf881eca92a4219787dfad05acb6b10e041fd6"}, "sources": [{"url": "/docs/13/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 13 English manual", "sha256": "c740d4c528ea137a87c0f9bf8ea8859fe6707c758374a12bc3c2390ac35427f1"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are returned either by the replication slot SQL interface or are sent by a walsender. In case of a walsender they are encapsulated inside the replication protocol WAL messages as described in Section 52.4 and generally obey same message flow as physical replication. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32
\n
\n

ID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column (except generated columns):

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32
\n
\n

ID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/13/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "579415e1a22e07102829a64c1e2dcb8d06d603318b2f4649bb60e3a702665ba3"}, "14": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32", "c2": "ID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32", "c2": "ID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/14/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=14", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v14.24/postgresql-14.24.tar.bz2", "label": "14.24", "major": "14", "channel": "stable", "revision": "a7fa7ed3d558172355f51406097a7bd4f6b473be80f311ef7cda96bf383d8897"}, "sources": [{"url": "/docs/14/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 14 English manual", "sha256": "4d5309e6070938fb53a3380c66fb64152d7984a368c86536d69ecac5bdb42852"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are returned either by the replication slot SQL interface or are sent by a walsender. In case of a walsender they are encapsulated inside the replication protocol WAL messages as described in Section 53.4 and generally obey same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32
\n
\n

ID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column (except generated columns):

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32
\n
\n

ID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/14/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32", "description": "ID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32", "description": "ID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "004251a41968b87b3777593a97dffe6c4759e7b71745344eca481cea7e45cf4a"}, "15": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/15/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=15", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v15.19/postgresql-15.19.tar.bz2", "label": "15.19", "major": "15", "channel": "stable", "revision": "e1a64a87a46b825b88c082e4518161a47aab53c45694964f8ba1df28f7859f89"}, "sources": [{"url": "/docs/15/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 15 English manual", "sha256": "dce726e09e3bfedfcea89e211772f1afb48a00fd03f33fb94ce66e6d6e2938f5"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 55.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication (except generated columns):

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/15/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}, "16": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/16/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=16", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v16.15/postgresql-16.15.tar.bz2", "label": "16.15", "major": "16", "channel": "stable", "revision": "c1575341fa7bd40f5274ea465b34390f4dc64cdd0770af327005caaeb9f6b7ed"}, "sources": [{"url": "/docs/16/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 16 English manual", "sha256": "23e3687e7c97c6a17a24684c30716fb7beed99c85967e828f4ee378effb5b50e"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 55.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication (except generated columns):

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/16/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}, "17": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/17/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=17", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v17.11/postgresql-17.11.tar.bz2", "label": "17.11", "major": "17", "channel": "stable", "revision": "dd27f2b3c59e73ed14aa3324901242bf69a032a6347805f274e6260322d42979"}, "sources": [{"url": "/docs/17/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 17 English manual", "sha256": "438b6a09f48bd0e9d2424559a0ab950dce44a9ab6573d362362c1c8d0b375fe3"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 53.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication (except generated columns):

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/17/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}, "18": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/18/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=18", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "sources": [{"url": "/docs/18/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 18 English manual", "sha256": "e976b008206820fbeb1eba226e69bb7c00af157372c3545375d1b5053c76d0ad"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 54.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication:

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/18/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}, "19": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/19/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=19", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v19beta4/postgresql-19beta4.tar.bz2", "label": "19beta4", "major": "19", "channel": "preview", "revision": "83157ee9c599d03b2f7a3d73ef3a56ec24e0e79cc2b3501a64d1364f56398c86"}, "sources": [{"url": "/docs/19/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 19 English manual", "sha256": "e09479de1e9cef5a4abc9703d423b68677f7f7e0e44c1098a2d37144980fd461"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 54.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication:

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/19/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}, "20": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/devel/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=20", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/snapshot/dev/postgresql-snapshot.tar.bz2", "label": "20devel", "major": "20", "channel": "devel", "revision": "4d3346909b201ac1648232cf290462a7070c119326f56196f1f0253ed80fae41"}, "sources": [{"url": "/docs/devel/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 20 English manual", "sha256": "1c5d9d7ff344de5d066562bb12e9db460a51b7713932ca201856714fa9477238"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 54.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication:

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/devel/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}}}, "snapshot": {"facts": [{"label": "Layer", "value": "Logical replication payload; distinct from the frontend/backend message envelope"}, {"label": "First field", "value": "Byte1('R')"}], "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}], "tables": [{"key": "fields", "rows": [{"c0": "1", "c1": "Byte1('R')", "c2": "Identifies the message as a relation message."}, {"c0": "2", "c1": "Int32 (TransactionId)", "c2": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"c0": "3", "c1": "Int32 (Oid)", "c2": "OID of the relation."}, {"c0": "4", "c1": "String", "c2": "Namespace (empty string for pg_catalog )."}, {"c0": "5", "c1": "String", "c2": "Relation name."}, {"c0": "6", "c1": "Int8", "c2": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"c0": "7", "c1": "Int16", "c2": "Number of columns."}, {"c0": "8", "c1": "Int8", "c2": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"c0": "9", "c1": "String", "c2": "Name of the column."}, {"c0": "10", "c1": "Int32 (Oid)", "c2": "OID of the column's data type."}, {"c0": "11", "c1": "Int32", "c2": "Type modifier of the column ( atttypmod )."}], "title": "Fields in documented order", "columns": [{"key": "c0", "label": "Position"}, {"key": "c1", "label": "Format"}, {"key": "c2", "label": "Meaning"}]}], "related": [{"url": "/docs/18/protocol-replication.html", "label": "Streaming replication protocol"}, {"url": "/wiki/decode/?v=18", "label": "Logical Decoding Plugins"}], "release": {"ref": "https://ftp.postgresql.org/pub/source/v18.6/postgresql-18.6.tar.bz2", "label": "18.6", "major": "18", "channel": "stable", "revision": "555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f"}, "sources": [{"url": "/docs/18/protocol-logicalrep-message-formats.html#PROTOCOL-LOGICALREP-MESSAGE-FORMATS-RELATION", "path": "protocol-logicalrep-message-formats.html", "label": "PostgreSQL 18 English manual", "sha256": "e976b008206820fbeb1eba226e69bb7c00af157372c3545375d1b5053c76d0ad"}], "sections": [{"title": "Protocol context", "paragraphs": ["This section describes the detailed format of each logical replication message. These messages are either returned by the replication slot SQL interface or are sent by a walsender. In the case of a walsender, they are encapsulated inside replication protocol WAL messages as described in Section 54.4 , and generally obey the same message flow as physical replication. The following messages (Stream Start, Stream Stop, Stream Commit, and Stream Abort) are available since protocol version 2. The following messages (Begin Prepare, Prepare, Commit Prepared, Rollback Prepared, Stream Prepare) are available since protocol version 3. The following message parts are shared by the above messages."]}], "signature": "Relation", "description": ["Logical replication Relation format. Identifies the message as a relation message."], "manual_html": "
\n
\n
\n
Byte1('R')
\n
\n

Identifies the message as a relation message.

\n
\n
Int32 (TransactionId)
\n
\n

Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2.

\n
\n
Int32 (Oid)
\n
\n

OID of the relation.

\n
\n
String
\n
\n

Namespace (empty string for pg_catalog).

\n
\n
String
\n
\n

Relation name.

\n
\n
Int8
\n
\n

Replica identity setting for the relation (same as relreplident in pg_class).

\n
\n
Int16
\n
\n

Number of columns.

\n
\n
\n
\n

Next, the following message part appears for each column included in the publication:

\n
\n
\n
Int8
\n
\n

Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key.

\n
\n
String
\n
\n

Name of the column.

\n
\n
Int32 (Oid)
\n
\n

OID of the column's data type.

\n
\n
Int32
\n
\n

Type modifier of the column (atttypmod).

\n
\n
\n
\n
", "manual_path": "/docs/18/protocol-logicalrep-message-formats.html", "comparison_data": {"layer": "logical replication", "fields": [{"format": "Byte1('R')", "description": "Identifies the message as a relation message."}, {"format": "Int32 (TransactionId)", "description": "Xid of the transaction (only present for streamed transactions). This field is available since protocol version 2."}, {"format": "Int32 (Oid)", "description": "OID of the relation."}, {"format": "String", "description": "Namespace (empty string for pg_catalog )."}, {"format": "String", "description": "Relation name."}, {"format": "Int8", "description": "Replica identity setting for the relation (same as relreplident in pg_class )."}, {"format": "Int16", "description": "Number of columns."}, {"format": "Int8", "description": "Flags for the column. Currently can be either 0 for no flags or 1 which marks the column as part of the key."}, {"format": "String", "description": "Name of the column."}, {"format": "Int32 (Oid)", "description": "OID of the column's data type."}, {"format": "Int32", "description": "Type modifier of the column ( atttypmod )."}]}, "comparison_hash": "e38e342bd63afe84c580ef245a7f6c70b95b32928e766a86e51f9732fd2569b4"}, "comparison": {"left": "17", "right": "18", "status": "unchanged", "diff": ""}}