Documentation / Object Identifier Types / Transaction and row identifiers
xid8
xid8
Another identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details.
Reading PostgreSQL 18.6.
Description
Another identifier type used by the system is xid , or transaction (abbreviated xact ) identifier. This is the data type of the system columns xmin and xmax . Transaction identifiers are 32-bit quantities. In some contexts, a 64-bit variant xid8 is used. Unlike xid values, xid8 values increase strictly monotonically and cannot be reused in the lifetime of a database cluster. See Section 67.1 for more details.
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Documentation and source
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- Version
- 18.6
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- PostgreSQL 18.6 Documentation
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8b3360302225f08ae72716ce1804596de95b568e5d31f788cb4597427b28cc38
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Back to Object Identifier Types · Recorded in PostgreSQL 13 through 20; the first sample is not necessarily its introduction.