diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/datatype.sgml | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/src/sgml/datatype.sgml b/doc/src/sgml/datatype.sgml index 03971822c29..89f3a7c1196 100644 --- a/doc/src/sgml/datatype.sgml +++ b/doc/src/sgml/datatype.sgml @@ -4517,6 +4517,10 @@ INSERT INTO mytable VALUES(-1); -- fails </indexterm> <indexterm zone="datatype-oid"> + <primary>xid8</primary> + </indexterm> + + <indexterm zone="datatype-oid"> <primary>cid</primary> </indexterm> @@ -4719,6 +4723,9 @@ SELECT * FROM pg_attribute Another identifier type used by the system is <type>xid</type>, or transaction (abbreviated <abbrev>xact</abbrev>) identifier. This is the data type of the system columns <structfield>xmin</structfield> and <structfield>xmax</structfield>. Transaction identifiers are 32-bit quantities. + In some contexts, a 64-bit variant <type>xid8</type> is used. Unlike + <type>xid</type> values, <type>xid8</type> values increase strictly + monotonically and cannot be reused in the lifetime of a database cluster. </para> <para> |