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Improve the plan cache invalidation mechanism to make it invalidate plans

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when user-defined functions used in a plan are modified.  Also invalidate
plans when schemas, operators, or operator classes are modified; but for these
cases we just invalidate everything rather than tracking exact dependencies,
since these types of objects seldom change in a production database.

Tom Lane; loosely based on a patch by Martin Pihlak.
This commit is contained in:
Tom Lane
2008-09-09 18:58:09 +00:00
parent c06629c72e
commit ee33b95d9c
18 changed files with 522 additions and 275 deletions
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15
src/backend/utils/cache/ts_cache.c vendored
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@ -20,7 +20,7 @@
* Copyright (c) 2006-2008, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/ts_cache.c,v 1.7 2008/04/12 23:14:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/ts_cache.c,v 1.8 2008/09/09 18:58:08 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -79,18 +79,19 @@ static Oid TSCurrentConfigCache = InvalidOid;
/*
* We use this catcache callback to detect when a visible change to a TS
* We use this syscache callback to detect when a visible change to a TS
* catalog entry has been made, by either our own backend or another one.
* We don't get enough information to know *which* specific catalog row
* changed, so we have to invalidate all related cache entries. Fortunately,
* it seems unlikely that TS configuration changes will occur often enough
* for this to be a performance problem.
*
* In principle we could just flush the specific cache entry that changed,
* but given that TS configuration changes are probably infrequent, it
* doesn't seem worth the trouble to determine that; we just flush all the
* entries of the related hash table.
*
* We can use the same function for all TS caches by passing the hash
* table address as the "arg".
*/
static void
InvalidateTSCacheCallBack(Datum arg, Oid relid)
InvalidateTSCacheCallBack(Datum arg, int cacheid, ItemPointer tuplePtr)
{
HTAB *hash = (HTAB *) DatumGetPointer(arg);
HASH_SEQ_STATUS status;