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Add VACUUM (DISABLE_PAGE_SKIPPING) for emergencies.

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If you really want to vacuum every single page in the relation,
regardless of apparent visibility status or anything else, you can use
this option.  In previous releases, this behavior could be achieved
using VACUUM (FREEZE), but because we can now recognize all-frozen
pages as not needing to be frozen again, that no longer works.  There
should be no need for routine use of this option, but maybe bugs or
disaster recovery will necessitate its use.

Patch by me, reviewed by Andres Freund.
This commit is contained in:
Robert Haas
2016-06-17 15:48:57 -04:00
parent 20eb2731b7
commit ede62e56fb
7 changed files with 97 additions and 46 deletions
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9
src/backend/commands/vacuum.c
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@@ -185,6 +185,15 @@ vacuum(int options, RangeVar *relation, Oid relid, VacuumParams *params,
errmsg("%s cannot be executed from VACUUM or ANALYZE",
stmttype)));
/*
* Sanity check DISABLE_PAGE_SKIPPING option.
*/
if ((options & VACOPT_FULL) != 0 &&
(options & VACOPT_DISABLE_PAGE_SKIPPING) != 0)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("VACUUM option DISABLE_PAGE_SKIPPING cannot be used with FULL")));
/*
* Send info about dead objects to the statistics collector, unless we are
* in autovacuum --- autovacuum.c does this for itself.