CopyData

CopyData is a bidirectional protocol message. Identifies the message as COPY data.

Reading PG 18·Select a recorded version

Direction: Frontend ↔ backend
First wire field: Byte1('d')
Field entries: 3
Documented flow contexts: COPY Operations
direction: F & B
manual path: /docs/18/protocol-message-formats.html
signature: CopyData (F & B)

Definition PG 18

Byte1('d'): Identifies the message as COPY data.
Int32: Length of message contents in bytes, including self.
Byten: Data that forms part of a COPY data stream. Messages sent from the backend will always correspond to single data rows, but messages sent by frontends might divide the data stream arbitrarily.

Wire fields in documented order

Position	Format	Meaning
1	Byte1('d')	Identifies the message as COPY data.
2	Int32	Length of message contents in bytes, including self.
3	Byte n	Data that forms part of a COPY data stream. Messages sent from the backend will always correspond to single data rows, but messages sent by frontends might divide the data stream arbitrarily.

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Complete source facts

fields

map[description:Identifies the message as COPY data. format:Byte1('d')], map[description:Length of message contents in bytes, including self. format:Int32], map[description:Data that forms part of a COPY data stream. Messages sent from the backend will always correspond to single data rows, but messages sent by frontends might divide the data stream arbitrarily. format:Byte n]

Source references

Full definition and evidence JSON

Definition sources

center · PostgreSQL 18 · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f

Text language: en · 555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f