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Add SQL type xid8 to expose FullTransactionId to users.

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Similar to xid, but 64 bits wide.  This new type is suitable for use in
various system views and administration functions.

Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com>
Reviewed-by: Takao Fujii <btfujiitkp@oss.nttdata.com>
Reviewed-by: Yoshikazu Imai <imai.yoshikazu@fujitsu.com>
Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://postgr.es/m/20190725000636.666m5mad25wfbrri%40alap3.anarazel.de
This commit is contained in:
Thomas Munro
2020-04-07 11:08:14 +12:00
parent 4bea576b03
commit aeec457de8
20 changed files with 464 additions and 2 deletions
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7
doc/src/sgml/datatype.sgml
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@ -4516,6 +4516,10 @@ INSERT INTO mytable VALUES(-1); -- fails
<primary>regtype</primary>
</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>