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Expand comment on how pg_upgrade is turning off autovacuum.

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This commit is contained in:
Bruce Momjian 2011-03-30 17:36:24 -04:00
parent 382fb6a08f
commit d609b08ead
1 changed files with 3 additions and 1 deletions
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4
contrib/pg_upgrade/server.c
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@ -172,7 +172,9 @@ start_postmaster(ClusterInfo *cluster, bool quiet)
*
* Using autovacuum=off disables cleanup vacuum and analyze, but
* freeze vacuums can still happen, so we set
* autovacuum_freeze_max_age high too.
* autovacuum_freeze_max_age very high. We assume all datfrozenxid and
* relfrozen values are less than a gap of 2000000000 from the current
* xid counter, so autovacuum will not touch them.
*/
snprintf(cmd, sizeof(cmd),
SYSTEMQUOTE "\"%s/pg_ctl\" -l \"%s\" -D \"%s\" "