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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 13:54:28 +00:00
parent 0998720d0c
commit a0084306e7
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
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.342.2.2 2007/03/14 18:49:04 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuum.c,v 1.342.2.3 2007/06/14 13:54:28 alvherre Exp $
*
*-------------------------------------------------------------------------
*/
@ -338,14 +338,17 @@ vacuum(VacuumStmt *vacstmt, List *relids)
* 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
* 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)
use_own_xacts = true;
else
{
Assert(vacstmt->analyze);
if (in_outer_xact)
if (IsAutoVacuumProcess())
use_own_xacts = true;
else if (in_outer_xact)
use_own_xacts = false;
else if (list_length(relations) > 1)
use_own_xacts = true;