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This type is a representation of \u003ccode\u003eXLogRecPtr\u003c/code\u003e and an internal system type of \u003cspan\u003ePostgreSQL\u003c/span\u003e.\u003c/p\u003e\n\u003cp\u003eInternally, an LSN is a 64-bit integer, representing a byte position in the write-ahead log stream. It is printed as two hexadecimal numbers of up to 8 digits each, separated by a slash; for example, \u003ccode\u003e16/B374D848\u003c/code\u003e. The \u003ccode\u003epg_lsn\u003c/code\u003e type supports the standard comparison operators, like \u003ccode\u003e=\u003c/code\u003e and \u003ccode\u003e\u0026gt;\u003c/code\u003e. Two LSNs can be subtracted using the \u003ccode\u003e-\u003c/code\u003e operator; the result is the number of bytes separating those write-ahead log locations. Also the number of bytes can be added into and subtracted from LSN using the \u003ccode\u003e+(pg_lsn,numeric)\u003c/code\u003e and \u003ccode\u003e-(pg_lsn,numeric)\u003c/code\u003e operators, respectively. Note that the calculated LSN should be in the range of \u003ccode\u003epg_lsn\u003c/code\u003e type, i.e., between \u003ccode\u003e0/0\u003c/code\u003e and \u003ccode\u003eFFFFFFFF/FFFFFFFF\u003c/code\u003e.\u003c/p\u003e\n\u003c/div\u003e","SourceRevision":"555610c24d53e4316da5b7d3fc25c279d96856d5e0e23ee308c328c5fa881d9f","ContentHash":"c5e51c835fab005cbdc4651660aabe562c3bfd859b49ee31f4ba357a2c31bee6","Payload":{"description":["PostgreSQL Log Sequence Number"],"manual_html":"\u003cdiv class=\"sect1\" id=\"DATATYPE-PG-LSN\"\u003e\n\u003cdiv class=\"titlepage\"\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\n\u003ch2 class=\"title\"\u003e8.20. \u003ccode class=\"type\"\u003epg_lsn\u003c/code\u003e Type \u003c/h2\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cp\u003eThe \u003ccode class=\"type\"\u003epg_lsn\u003c/code\u003e data type can be used to store LSN (Log Sequence Number) data which is a pointer to a location in the WAL. This type is a representation of \u003ccode class=\"type\"\u003eXLogRecPtr\u003c/code\u003e and an internal system type of \u003cspan class=\"productname\"\u003ePostgreSQL\u003c/span\u003e.\u003c/p\u003e\n\u003cp\u003eInternally, an LSN is a 64-bit integer, representing a byte position in the write-ahead log stream. It is printed as two hexadecimal numbers of up to 8 digits each, separated by a slash; for example, \u003ccode class=\"literal\"\u003e16/B374D848\u003c/code\u003e. The \u003ccode class=\"type\"\u003epg_lsn\u003c/code\u003e type supports the standard comparison operators, like \u003ccode class=\"literal\"\u003e=\u003c/code\u003e and \u003ccode class=\"literal\"\u003e\u0026gt;\u003c/code\u003e. Two LSNs can be subtracted using the \u003ccode class=\"literal\"\u003e-\u003c/code\u003e operator; the result is the number of bytes separating those write-ahead log locations. Also the number of bytes can be added into and subtracted from LSN using the \u003ccode class=\"literal\"\u003e+(pg_lsn,numeric)\u003c/code\u003e and \u003ccode class=\"literal\"\u003e-(pg_lsn,numeric)\u003c/code\u003e operators, respectively. Note that the calculated LSN should be in the range of \u003ccode class=\"type\"\u003epg_lsn\u003c/code\u003e type, i.e., between \u003ccode class=\"literal\"\u003e0/0\u003c/code\u003e and \u003ccode class=\"literal\"\u003eFFFFFFFF/FFFFFFFF\u003c/code\u003e.\u003c/p\u003e\n\u003c/div\u003e","related":[{"label":"pg_type catalog","url":"/wiki/catalog/pg_type/?v=18"},{"label":"pg_cast catalog","url":"/wiki/catalog/pg_cast/?v=18"},{"label":"pg_operator catalog","url":"/wiki/catalog/pg_operator/?v=18"},{"label":"pg_opclass catalog","url":"/wiki/catalog/pg_opclass/?v=18"},{"label":"Arrays","url":"/wiki/type/arrays/?v=18"},{"label":"brin index access method","url":"/wiki/indexam/brin/?v=18"},{"label":"btree index access method","url":"/wiki/indexam/btree/?v=18"},{"label":"hash index access method","url":"/wiki/indexam/hash/?v=18"}],"sections":[]}},"RequestedLocale":"zh-Hans","Fallback":true,"Versions":["10","11","12","13","14","15","16","17","18","19","20"],"Locales":["en"],"Signatures":null,"Spellings":null,"SQLState":null,"Evidence":null}