1996-08-28 03:59:28 +02:00
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/*-------------------------------------------------------------------------
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*
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1999-02-14 00:22:53 +01:00
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* catcache.h
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1997-09-07 07:04:48 +02:00
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* Low-level catalog cache definitions.
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1996-08-28 03:59:28 +02:00
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*
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2000-11-10 01:33:12 +01:00
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* NOTE: every catalog cache must have a corresponding unique index on
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* the system table that it caches --- ie, the index must match the keys
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* used to do lookups in this cache. All cache fetches are done with
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* indexscans (under normal conditions). The index should be unique to
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* guarantee that there can only be one matching row for a key combination.
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*
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1996-08-28 03:59:28 +02:00
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*
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2001-01-24 20:43:33 +01:00
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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2000-01-26 06:58:53 +01:00
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* Portions Copyright (c) 1994, Regents of the University of California
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1996-08-28 03:59:28 +02:00
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*
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2002-03-03 18:47:56 +01:00
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* $Id: catcache.h,v 1.39 2002/03/03 17:47:56 tgl Exp $
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1996-08-28 03:59:28 +02:00
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*
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*-------------------------------------------------------------------------
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*/
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1997-09-07 07:04:48 +02:00
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#ifndef CATCACHE_H
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1996-08-28 03:59:28 +02:00
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#define CATCACHE_H
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1999-07-16 01:04:24 +02:00
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#include "access/htup.h"
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#include "lib/dllist.h"
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1996-08-28 03:59:28 +02:00
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2000-06-17 06:56:39 +02:00
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/*
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2000-11-10 01:33:12 +01:00
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* struct catctup: individual tuple in the cache.
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1997-09-07 07:04:48 +02:00
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* struct catcache: information for managing a cache.
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2001-06-18 05:35:07 +02:00
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* struct catcacheheader: information for managing all the caches.
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1996-08-28 03:59:28 +02:00
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*/
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2001-06-18 05:35:07 +02:00
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typedef struct catcache
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{
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int id; /* cache identifier --- see syscache.h */
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struct catcache *cc_next; /* link to next catcache */
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char *cc_relname; /* name of relation the tuples come from */
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char *cc_indname; /* name of index matching cache keys */
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2002-03-03 18:47:56 +01:00
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Oid cc_reloid; /* OID of relation the tuples come from */
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2001-10-25 07:50:21 +02:00
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bool cc_relisshared; /* is relation shared? */
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2001-06-18 05:35:07 +02:00
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TupleDesc cc_tupdesc; /* tuple descriptor (copied from reldesc) */
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2002-03-03 18:47:56 +01:00
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int cc_reloidattr; /* AttrNumber of relation OID attr, or 0 */
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2001-06-18 05:35:07 +02:00
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int cc_ntup; /* # of tuples currently in this cache */
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int cc_size; /* # of hash buckets in this cache */
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int cc_nkeys; /* number of keys (1..4) */
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int cc_key[4]; /* AttrNumber of each key */
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PGFunction cc_hashfunc[4]; /* hash function to use for each key */
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ScanKeyData cc_skey[4]; /* precomputed key info for heap scans */
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2002-03-03 18:47:56 +01:00
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bool cc_isname[4]; /* flag key columns that are NAMEs */
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2002-02-19 21:11:20 +01:00
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#ifdef CATCACHE_STATS
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long cc_searches; /* total # searches against this cache */
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long cc_hits; /* # of matches against existing entry */
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2002-03-03 18:47:56 +01:00
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long cc_neg_hits; /* # of matches against negative entry */
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2002-02-19 21:11:20 +01:00
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long cc_newloads; /* # of successful loads of new entry */
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2002-03-03 18:47:56 +01:00
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/*
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* cc_searches - (cc_hits + cc_neg_hits + cc_newloads) is number of
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* failed searches, each of which will result in loading a negative entry
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*/
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long cc_invals; /* # of entries invalidated from cache */
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long cc_discards; /* # of entries discarded due to overflow */
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2002-02-19 21:11:20 +01:00
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#endif
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2001-06-18 05:35:07 +02:00
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Dllist cc_bucket[1]; /* hash buckets --- VARIABLE LENGTH ARRAY */
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} CatCache; /* VARIABLE LENGTH STRUCT */
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1997-09-07 07:04:48 +02:00
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typedef struct catctup
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{
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2000-11-16 23:30:52 +01:00
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int ct_magic; /* for Assert checks */
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#define CT_MAGIC 0x57261502
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2001-06-18 05:35:07 +02:00
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CatCache *my_cache; /* link to owning catcache */
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2001-10-25 07:50:21 +02:00
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2000-04-12 19:17:23 +02:00
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/*
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2000-11-16 23:30:52 +01:00
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* Each tuple in a cache is a member of two lists: one lists all the
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2001-06-18 05:35:07 +02:00
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* elements in all the caches in LRU order, and the other lists just
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* the elements in one hashbucket of one cache, also in LRU order.
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2000-11-16 23:30:52 +01:00
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*
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* A tuple marked "dead" must not be returned by subsequent searches.
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* However, it won't be physically deleted from the cache until its
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* refcount goes to zero.
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2002-03-03 18:47:56 +01:00
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*
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* A negative cache entry is an assertion that there is no tuple
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* matching a particular key. This is just as useful as a normal entry
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* so far as avoiding catalog searches is concerned. Management of
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* positive and negative entries is identical.
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1999-06-04 04:19:47 +02:00
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*/
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2000-11-16 23:30:52 +01:00
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Dlelem lrulist_elem; /* list member of global LRU list */
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Dlelem cache_elem; /* list member of per-bucket list */
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int refcount; /* number of active references */
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bool dead; /* dead but not yet removed? */
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2002-03-03 18:47:56 +01:00
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bool negative; /* negative cache entry? */
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uint32 hash_value; /* hash value for this tuple's keys */
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2000-11-16 23:30:52 +01:00
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HeapTupleData tuple; /* tuple management header */
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1997-09-08 23:56:23 +02:00
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} CatCTup;
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1996-08-28 03:59:28 +02:00
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2000-11-16 23:30:52 +01:00
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2001-06-18 05:35:07 +02:00
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typedef struct catcacheheader
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1997-09-07 07:04:48 +02:00
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{
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2001-06-18 05:35:07 +02:00
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CatCache *ch_caches; /* head of list of CatCache structs */
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int ch_ntup; /* # of tuples in all caches */
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int ch_maxtup; /* max # of tuples allowed (LRU) */
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Dllist ch_lrulist; /* overall LRU list, most recent first */
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} CatCacheHeader;
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1996-08-28 03:59:28 +02:00
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2000-06-28 05:33:33 +02:00
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/* this extern duplicates utils/memutils.h... */
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extern MemoryContext CacheMemoryContext;
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1996-08-28 03:59:28 +02:00
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2000-06-28 05:33:33 +02:00
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extern void CreateCacheMemoryContext(void);
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2000-11-16 23:30:52 +01:00
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extern void AtEOXact_CatCache(bool isCommit);
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2000-11-10 01:33:12 +01:00
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2000-11-16 23:30:52 +01:00
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extern CatCache *InitCatCache(int id, char *relname, char *indname,
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2001-10-25 07:50:21 +02:00
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int reloidattr,
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int nkeys, int *key);
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2002-02-19 21:11:20 +01:00
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extern void InitCatCachePhase2(CatCache *cache);
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2000-11-16 23:30:52 +01:00
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extern HeapTuple SearchCatCache(CatCache *cache,
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2001-03-22 05:01:46 +01:00
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Datum v1, Datum v2,
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Datum v3, Datum v4);
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2000-11-16 23:30:52 +01:00
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extern void ReleaseCatCache(HeapTuple tuple);
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2000-11-10 01:33:12 +01:00
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2001-06-18 05:35:07 +02:00
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extern void ResetCatalogCaches(void);
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extern void CatalogCacheFlushRelation(Oid relId);
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2002-03-03 18:47:56 +01:00
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extern void CatalogCacheIdInvalidate(int cacheId, uint32 hashValue,
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2001-03-22 05:01:46 +01:00
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ItemPointer pointer);
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2001-01-05 23:54:37 +01:00
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extern void PrepareToInvalidateCacheTuple(Relation relation,
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2001-10-25 07:50:21 +02:00
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HeapTuple tuple,
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2002-03-03 18:47:56 +01:00
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void (*function) (int, uint32, ItemPointer, Oid));
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2001-10-28 07:26:15 +01:00
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2001-11-05 18:46:40 +01:00
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#endif /* CATCACHE_H */
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