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Avoid having autovacuum run multiple ANALYZE commands in a single transaction,

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to prevent possible deadlock problems.  Per request from Tom Lane.
This commit is contained in:
Alvaro Herrera 2007-06-14 13:53:14 +00:00
parent 56813a998c
commit bd06ab29ae
1 changed files with 6 additions and 3 deletions
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9
src/backend/commands/vacuum.c
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@ -13,7 +13,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.352 2007/05/30 20:11:57 tgl Exp $ * $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.353 2007/06/14 13:53:14 alvherre Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -359,14 +359,17 @@ vacuum(VacuumStmt *vacstmt, List *relids,
* For ANALYZE (no VACUUM): if inside a transaction block, we cannot * For ANALYZE (no VACUUM): if inside a transaction block, we cannot
* start/commit our own transactions. Also, there's no need to do so if * start/commit our own transactions. Also, there's no need to do so if
* only processing one relation. For multiple relations when not within a * only processing one relation. For multiple relations when not within a
* transaction block, use own transactions so we can release locks sooner. * transaction block, and also in an autovacuum worker, use own
* transactions so we can release locks sooner.
*/ */
if (vacstmt->vacuum) if (vacstmt->vacuum)
use_own_xacts = true; use_own_xacts = true;
else else
{ {
Assert(vacstmt->analyze); Assert(vacstmt->analyze);
if (in_outer_xact) if (IsAutoVacuumWorkerProcess())
use_own_xacts = true;
else if (in_outer_xact)
use_own_xacts = false; use_own_xacts = false;
else if (list_length(relations) > 1) else if (list_length(relations) > 1)
use_own_xacts = true; use_own_xacts = true;