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The local buffer manager is no longer used for newly-created relations (unless they are TEMP); a new non-TEMP relation goes through the shared bufmgr and thus will participate normally in checkpoints. But TEMP relations use the local buffer manager throughout their lifespan. Also, operations in TEMP relations are not logged in WAL, thus improving performance. Since it's no longer necessary to fsync relations as they move out of the local buffers into shared buffers, quite a lot of smgr.c/md.c/fd.c code is no longer needed and has been removed: there's no concept of a dirty relation anymore in md.c/fd.c, and we never fsync anything but WAL. Still TODO: improve local buffer management algorithms so that it would be reasonable to increase NLocBuffer.
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* relcache.h
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* Relation descriptor cache definitions.
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*
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*
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* Portions Copyright (c) 1996-2002, 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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* $Id: relcache.h,v 1.34 2002/08/06 02:36:35 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef RELCACHE_H
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#define RELCACHE_H
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#include "utils/rel.h"
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/*
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* relation lookup routines
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*/
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extern Relation RelationIdGetRelation(Oid relationId);
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extern Relation RelationSysNameGetRelation(const char *relationName);
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/* finds an existing cache entry, but won't make a new one */
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extern Relation RelationIdCacheGetRelation(Oid relationId);
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extern Relation RelationNodeCacheGetRelation(RelFileNode rnode);
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extern void RelationClose(Relation relation);
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/*
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* Routines to compute/retrieve additional cached information
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*/
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extern List *RelationGetIndexList(Relation relation);
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extern void RelationInitIndexAccessInfo(Relation relation);
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/*
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* Routines for backend startup
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*/
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extern void RelationCacheInitialize(void);
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extern void RelationCacheInitializePhase2(void);
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extern void RelationCacheInitializePhase3(void);
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/*
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* Routine to create a relcache entry for an about-to-be-created relation
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*/
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extern Relation RelationBuildLocalRelation(const char *relname,
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Oid relnamespace,
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TupleDesc tupDesc,
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Oid relid, Oid dbid,
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RelFileNode rnode,
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bool nailit);
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/*
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* Routines for flushing/rebuilding relcache entries in various scenarios
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*/
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extern void RelationForgetRelation(Oid rid);
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extern void RelationIdInvalidateRelationCacheByRelationId(Oid relationId);
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extern void RelationCacheInvalidate(void);
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extern void AtEOXact_RelationCache(bool commit);
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/*
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* Routines to help manage rebuilding of relcache init file
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*/
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extern bool RelationIdIsInInitFile(Oid relationId);
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extern void RelationCacheInitFileInvalidate(bool beforeSend);
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/* XLOG support */
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extern void CreateDummyCaches(void);
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extern void DestroyDummyCaches(void);
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/* should be used only by relcache.c and catcache.c */
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extern bool criticalRelcachesBuilt;
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#endif /* RELCACHE_H */
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