diff options
| author | Bruce Momjian | 2014-09-10 21:13:04 +0000 |
|---|---|---|
| committer | Bruce Momjian | 2014-09-10 21:13:04 +0000 |
| commit | 36ad1a87a368d837d5c2260b2fd2ff83e976425a (patch) | |
| tree | b951f5f04b2f8f46f3d5947e092590b7f248d07d /doc/src | |
| parent | 84aa8ba128a08e6fdebb2497c7a79ebf18093e12 (diff) | |
Implement mxid_age() to compute multi-xid age
Report by Josh Berkus
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/maintenance.sgml | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml index cf174f07157..d692308cf49 100644 --- a/doc/src/sgml/maintenance.sgml +++ b/doc/src/sgml/maintenance.sgml @@ -640,7 +640,12 @@ HINT: Stop the postmaster and vacuum that database in single-user mode. possible multixact ID still appearing in any tuple of that table. If this value is older than <xref linkend="guc-vacuum-multixact-freeze-table-age">, a whole-table - scan is forced. Whole-table <command>VACUUM</> scans, regardless of + scan is forced. <function>mxid_age()</> can be used on + <structname>pg_class</>.<structfield>relminmxid</> to find its age. + </para> + + <para> + Whole-table <command>VACUUM</> scans, regardless of what causes them, enable advancing the value for that table. Eventually, as all tables in all databases are scanned and their oldest multixact values are advanced, on-disk storage for older |