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895a94de6d
but no database changes have been made since the last CommandCounterIncrement. This should result in a significant improvement in the number of "commands" that can typically be performed within a transaction before hitting the 2^32 CommandId size limit. In particular this buys back (and more) the possible adverse consequences of my previous patch to fix plan caching behavior. The implementation requires tracking whether the current CommandCounter value has been "used" to mark any tuples. CommandCounter values stored into snapshots are presumed not to be used for this purpose. This requires some small executor changes, since the executor used to conflate the curcid of the snapshot it was using with the command ID to mark output tuples with. Separating these concepts allows some small simplifications in executor APIs. Something for the TODO list: look into having CommandCounterIncrement not do AcceptInvalidationMessages. It seems fairly bogus to be doing it there, but exactly where to do it instead isn't clear, and I'm disinclined to mess with asynchronous behavior during late beta.
173 lines
5.4 KiB
C
173 lines
5.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* trigger.h
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* Declarations for trigger handling.
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*
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* Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/commands/trigger.h,v 1.64 2007/11/30 21:22:54 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef TRIGGER_H
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#define TRIGGER_H
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#include "nodes/execnodes.h"
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#include "nodes/parsenodes.h"
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/*
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* TriggerData is the node type that is passed as fmgr "context" info
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* when a function is called by the trigger manager.
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*/
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#define CALLED_AS_TRIGGER(fcinfo) \
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((fcinfo)->context != NULL && IsA((fcinfo)->context, TriggerData))
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typedef uint32 TriggerEvent;
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typedef struct TriggerData
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{
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NodeTag type;
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TriggerEvent tg_event;
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Relation tg_relation;
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HeapTuple tg_trigtuple;
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HeapTuple tg_newtuple;
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Trigger *tg_trigger;
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Buffer tg_trigtuplebuf;
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Buffer tg_newtuplebuf;
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} TriggerData;
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/* TriggerEvent bit flags */
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#define TRIGGER_EVENT_INSERT 0x00000000
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#define TRIGGER_EVENT_DELETE 0x00000001
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#define TRIGGER_EVENT_UPDATE 0x00000002
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#define TRIGGER_EVENT_OPMASK 0x00000003
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#define TRIGGER_EVENT_ROW 0x00000004
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#define TRIGGER_EVENT_BEFORE 0x00000008
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/* More TriggerEvent flags, used only within trigger.c */
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#define AFTER_TRIGGER_DONE 0x00000010
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#define AFTER_TRIGGER_IN_PROGRESS 0x00000020
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#define AFTER_TRIGGER_DEFERRABLE 0x00000040
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#define AFTER_TRIGGER_INITDEFERRED 0x00000080
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#define TRIGGER_FIRED_BY_INSERT(event) \
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(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
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TRIGGER_EVENT_INSERT)
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#define TRIGGER_FIRED_BY_DELETE(event) \
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(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
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TRIGGER_EVENT_DELETE)
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#define TRIGGER_FIRED_BY_UPDATE(event) \
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(((TriggerEvent) (event) & TRIGGER_EVENT_OPMASK) == \
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TRIGGER_EVENT_UPDATE)
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#define TRIGGER_FIRED_FOR_ROW(event) \
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((TriggerEvent) (event) & TRIGGER_EVENT_ROW)
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#define TRIGGER_FIRED_FOR_STATEMENT(event) \
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(!TRIGGER_FIRED_FOR_ROW (event))
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#define TRIGGER_FIRED_BEFORE(event) \
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((TriggerEvent) (event) & TRIGGER_EVENT_BEFORE)
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#define TRIGGER_FIRED_AFTER(event) \
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(!TRIGGER_FIRED_BEFORE (event))
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/*
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* Definitions for the replication role based firing.
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*/
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#define SESSION_REPLICATION_ROLE_ORIGIN 0
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#define SESSION_REPLICATION_ROLE_REPLICA 1
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#define SESSION_REPLICATION_ROLE_LOCAL 2
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extern int SessionReplicationRole;
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#define TRIGGER_FIRES_ON_ORIGIN 'O'
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#define TRIGGER_FIRES_ALWAYS 'A'
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#define TRIGGER_FIRES_ON_REPLICA 'R'
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#define TRIGGER_DISABLED 'D'
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extern Oid CreateTrigger(CreateTrigStmt *stmt, Oid constraintOid);
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extern void DropTrigger(Oid relid, const char *trigname,
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DropBehavior behavior, bool missing_ok);
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extern void RemoveTriggerById(Oid trigOid);
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extern void renametrig(Oid relid, const char *oldname, const char *newname);
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extern void EnableDisableTrigger(Relation rel, const char *tgname,
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char fires_when, bool skip_system);
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extern void RelationBuildTriggers(Relation relation);
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extern TriggerDesc *CopyTriggerDesc(TriggerDesc *trigdesc);
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extern void FreeTriggerDesc(TriggerDesc *trigdesc);
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extern void ExecBSInsertTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASInsertTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern HeapTuple ExecBRInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple);
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extern void ExecARInsertTriggers(EState *estate,
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ResultRelInfo *relinfo,
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HeapTuple trigtuple);
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extern void ExecBSDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern bool ExecBRDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid);
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extern void ExecARDeleteTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid);
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extern void ExecBSUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern void ExecASUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo);
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extern HeapTuple ExecBRUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple newtuple);
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extern void ExecARUpdateTriggers(EState *estate,
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ResultRelInfo *relinfo,
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ItemPointer tupleid,
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HeapTuple newtuple);
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extern void AfterTriggerBeginXact(void);
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extern void AfterTriggerBeginQuery(void);
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extern void AfterTriggerEndQuery(EState *estate);
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extern void AfterTriggerFireDeferred(void);
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extern void AfterTriggerEndXact(bool isCommit);
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extern void AfterTriggerBeginSubXact(void);
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extern void AfterTriggerEndSubXact(bool isCommit);
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extern void AfterTriggerSetState(ConstraintsSetStmt *stmt);
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extern void AfterTriggerCheckTruncate(List *relids);
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/*
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* in utils/adt/ri_triggers.c
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*/
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extern bool RI_FKey_keyequal_upd_pk(Trigger *trigger, Relation pk_rel,
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HeapTuple old_row, HeapTuple new_row);
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extern bool RI_FKey_keyequal_upd_fk(Trigger *trigger, Relation fk_rel,
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HeapTuple old_row, HeapTuple new_row);
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extern bool RI_Initial_Check(Trigger *trigger,
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Relation fk_rel, Relation pk_rel);
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/* result values for RI_FKey_trigger_type: */
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#define RI_TRIGGER_PK 1 /* is a trigger on the PK relation */
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#define RI_TRIGGER_FK 2 /* is a trigger on the FK relation */
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#define RI_TRIGGER_NONE 0 /* is not an RI trigger function */
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extern int RI_FKey_trigger_type(Oid tgfoid);
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#endif /* TRIGGER_H */
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