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Disallow VACUUM, ANALYZE, TRUNCATE on temp tables belonging to other

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backends.  Given that temp tables now store data locally in the local
buffer manager, these things are not going to work safely.
This commit is contained in:
Tom Lane
2002-09-23 20:43:41 +00:00
parent c99f820053
commit 5fa3418304
5 changed files with 64 additions and 5 deletions
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16
src/backend/commands/vacuum.c
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@ -13,7 +13,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.239 2002/09/23 00:42:48 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/vacuum.c,v 1.240 2002/09/23 20:43:41 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -775,6 +775,20 @@ vacuum_rel(Oid relid, VacuumStmt *vacstmt, char expected_relkind)
return;
}
/*
* Silently ignore tables that are temp tables of other backends ---
* trying to vacuum these will lead to great unhappiness, since their
* contents are probably not up-to-date on disk. (We don't throw a
* warning here; it would just lead to chatter during a database-wide
* VACUUM.)
*/
if (isOtherTempNamespace(RelationGetNamespace(onerel)))
{
relation_close(onerel, lmode);
CommitTransactionCommand(true);
return;
}
/*
* Get a session-level lock too. This will protect our access to the
* relation across multiple transactions, so that we can vacuum the