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The session_replication_role actually can be changed at will during 

a session regardless of the existence of cached plans. The plancache
only needs to be invalidated so that rules affected by the new setting
will be reflected in the new query plans.

Jan
This commit is contained in:
Jan Wieck 2007-06-05 20:00:41 +00:00
parent f74426283d
commit 1120b99445
3 changed files with 12 additions and 19 deletions
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13
src/backend/utils/cache/plancache.c vendored
View File

@ -33,7 +33,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/plancache.c,v 1.9 2007/05/14 18:13:21 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/plancache.c,v 1.10 2007/06/05 20:00:41 wieck Exp $
*
*-------------------------------------------------------------------------
*/
@ -944,14 +944,3 @@ InvalRelid(Oid relid, LOCKMODE lockmode, InvalRelidContext *context)
if (relid == context->inval_relid || context->inval_relid == InvalidOid)
context->plan->dead = true;
}
/*
* HaveCachedPlans
* Check if the plancache has stored any plans at all.
*/
bool
HaveCachedPlans(void)
{
return (cached_plans_list != NIL);
}

15
src/backend/utils/misc/guc.c
View File

@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.393 2007/06/03 17:07:34 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.394 2007/06/05 20:00:41 wieck Exp $
*
*--------------------------------------------------------------------
*/
@ -6270,24 +6270,29 @@ assign_defaultxactisolevel(const char *newval, bool doit, GucSource source)
static const char *
assign_session_replication_role(const char *newval, bool doit, GucSource source)
{
if (HaveCachedPlans())
elog(ERROR, "session_replication_role cannot be changed "
"after prepared plans have been cached");
if (pg_strcasecmp(newval, "origin") == 0)
{
if (doit)
{
ResetPlanCache();
SessionReplicationRole = SESSION_REPLICATION_ROLE_ORIGIN;
}
}
else if (pg_strcasecmp(newval, "replica") == 0)
{
if (doit)
{
ResetPlanCache();
SessionReplicationRole = SESSION_REPLICATION_ROLE_REPLICA;
}
}
else if (pg_strcasecmp(newval, "local") == 0)
{
if (doit)
{
ResetPlanCache();
SessionReplicationRole = SESSION_REPLICATION_ROLE_LOCAL;
}
}
else
return NULL;

3
src/include/utils/plancache.h
View File

@ -8,7 +8,7 @@
* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/plancache.h,v 1.6 2007/04/16 18:21:07 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/plancache.h,v 1.7 2007/06/05 20:00:41 wieck Exp $
*
*-------------------------------------------------------------------------
*/
@ -106,7 +106,6 @@ extern CachedPlan *RevalidateCachedPlan(CachedPlanSource *plansource,
bool useResOwner);
extern void ReleaseCachedPlan(CachedPlan *plan, bool useResOwner);
extern TupleDesc PlanCacheComputeResultDesc(List *stmt_list);
extern bool HaveCachedPlans(void);
extern void ResetPlanCache(void);