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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2017-01-03 19:48:53 +01:00
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* Portions Copyright (c) 1996-2017, 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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2010-09-20 22:08:53 +02:00
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* src/include/utils/catcache.h
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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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2003-11-09 22:30:38 +01:00
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#include "access/skey.h"
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2012-10-16 22:36:30 +02:00
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#include "lib/ilist.h"
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2008-06-19 02:46:06 +02:00
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#include "utils/relcache.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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2002-04-06 08:59:25 +02:00
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* struct catclist: list of tuples matching a partial key.
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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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2010-02-14 19:42:19 +01:00
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#define CATCACHE_MAXKEYS 4
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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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2012-10-16 22:36:30 +02:00
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slist_node cc_next; /* list link */
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2002-03-26 20:17:02 +01:00
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const char *cc_relname; /* name of relation the tuples come from */
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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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2005-04-14 22:03:27 +02:00
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Oid cc_indexoid; /* OID of index matching cache keys */
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2002-04-06 08:59:25 +02:00
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bool cc_relisshared; /* is relation shared across databases? */
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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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int cc_ntup; /* # of tuples currently in this cache */
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2002-03-06 21:49:46 +01:00
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int cc_nbuckets; /* # of hash buckets in this cache */
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2010-02-14 19:42:19 +01:00
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int cc_nkeys; /* # of keys (1..CATCACHE_MAXKEYS) */
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int cc_key[CATCACHE_MAXKEYS]; /* AttrNumber of each key */
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2010-02-26 03:01:40 +01:00
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PGFunction cc_hashfunc[CATCACHE_MAXKEYS]; /* hash function for each key */
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ScanKeyData cc_skey[CATCACHE_MAXKEYS]; /* precomputed key info for
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* heap scans */
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2010-02-14 19:42:19 +01:00
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bool cc_isname[CATCACHE_MAXKEYS]; /* flag "name" key columns */
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2012-10-16 22:36:30 +02:00
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dlist_head cc_lists; /* list of CatCList structs */
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2017-01-13 00:59:46 +01:00
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dlist_head *cc_bucket; /* hash buckets */
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/*
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* Keep these at the end, so that compiling catcache.c with CATCACHE_STATS
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* doesn't break ABI for other modules
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*/
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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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2002-09-04 22:31:48 +02:00
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2002-03-03 18:47:56 +01:00
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/*
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2005-10-15 04:49:52 +02:00
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* cc_searches - (cc_hits + cc_neg_hits + cc_newloads) is number of failed
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* searches, each of which will result in loading a negative entry
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2002-03-03 18:47:56 +01:00
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*/
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long cc_invals; /* # of entries invalidated from cache */
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2002-04-06 08:59:25 +02:00
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long cc_lsearches; /* total # list-searches */
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long cc_lhits; /* # of matches against existing lists */
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2002-02-19 21:11:20 +01:00
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#endif
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2013-09-05 18:47:56 +02:00
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} CatCache;
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2001-06-18 05:35:07 +02:00
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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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2002-04-06 08:59:25 +02:00
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int ct_magic; /* for identifying CatCTup entries */
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2000-11-16 23:30:52 +01:00
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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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2012-10-16 22:36:30 +02:00
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* Each tuple in a cache is a member of a dlist that stores the elements
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2014-05-06 18:12:18 +02:00
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* of its hash bucket. We keep each dlist in LRU order to speed repeated
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2006-06-15 04:08:09 +02:00
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* lookups.
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2005-08-14 00:18:07 +02:00
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*/
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2012-10-16 22:36:30 +02:00
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dlist_node cache_elem; /* list member of per-bucket list */
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2005-08-14 00:18:07 +02:00
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/*
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2014-05-06 18:12:18 +02:00
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* The tuple may also be a member of at most one CatCList. (If a single
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2005-10-15 04:49:52 +02:00
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* catcache is list-searched with varying numbers of keys, we may have to
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* make multiple entries for the same tuple because of this restriction.
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* Currently, that's not expected to be common, so we accept the potential
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* inefficiency.)
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2002-04-06 08:59:25 +02:00
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*/
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2005-08-14 00:18:07 +02:00
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struct catclist *c_list; /* containing CatCList, or NULL if none */
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2002-09-04 22:31:48 +02:00
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2002-04-06 08:59:25 +02:00
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/*
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2000-11-16 23:30:52 +01:00
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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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2005-08-14 00:18:07 +02:00
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* refcount goes to zero. (If it's a member of a CatCList, the list's
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2005-10-15 04:49:52 +02:00
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* refcount must go to zero, too; also, remember to mark the list dead at
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* the same time the tuple is marked.)
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2002-03-03 18:47:56 +01:00
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*
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2005-11-22 19:17:34 +01:00
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* A negative cache entry is an assertion that there is no tuple matching
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* a particular key. This is just as useful as a normal entry so far as
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2014-05-06 18:12:18 +02:00
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* avoiding catalog searches is concerned. Management of positive and
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2005-10-15 04:49:52 +02:00
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* 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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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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2002-04-06 08:59:25 +02:00
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typedef struct catclist
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{
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int cl_magic; /* for identifying CatCList entries */
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#define CL_MAGIC 0x52765103
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CatCache *my_cache; /* link to owning catcache */
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/*
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2005-10-15 04:49:52 +02:00
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* A CatCList describes the result of a partial search, ie, a search using
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2014-05-06 18:12:18 +02:00
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* only the first K key columns of an N-key cache. We form the keys used
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2005-10-15 04:49:52 +02:00
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* into a tuple (with other attributes NULL) to represent the stored key
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* set. The CatCList object contains links to cache entries for all the
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* table rows satisfying the partial key. (Note: none of these will be
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* negative cache entries.)
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2002-04-06 08:59:25 +02:00
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*
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2006-06-15 04:08:09 +02:00
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* A CatCList is only a member of a per-cache list; we do not currently
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* divide them into hash buckets.
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2002-04-06 08:59:25 +02:00
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*
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2005-11-22 19:17:34 +01:00
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* A list 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. (A list should be marked dead if any of its
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* member entries are dead.)
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2002-04-06 08:59:25 +02:00
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*
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2002-09-04 22:31:48 +02:00
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* If "ordered" is true then the member tuples appear in the order of the
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2005-10-15 04:49:52 +02:00
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* cache's underlying index. This will be true in normal operation, but
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* might not be true during bootstrap or recovery operations. (namespace.c
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* is able to save some cycles when it is true.)
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2002-04-06 08:59:25 +02:00
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*/
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2012-10-16 22:36:30 +02:00
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dlist_node cache_elem; /* list member of per-catcache list */
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2002-04-06 08:59:25 +02:00
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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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bool ordered; /* members listed in index order? */
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short nkeys; /* number of lookup keys specified */
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uint32 hash_value; /* hash value for lookup keys */
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HeapTupleData tuple; /* header for tuple holding keys */
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int n_members; /* number of member tuples */
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2015-02-20 06:11:42 +01:00
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CatCTup *members[FLEXIBLE_ARRAY_MEMBER]; /* members */
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} CatCList;
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2002-04-06 08:59:25 +02:00
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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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2012-10-16 22:36:30 +02:00
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slist_head ch_caches; /* head of list of CatCache structs */
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2001-06-18 05:35:07 +02:00
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int ch_ntup; /* # of tuples in all caches */
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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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2007-07-25 14:22:54 +02:00
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extern PGDLLIMPORT 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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2005-04-14 22:03:27 +02:00
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extern CatCache *InitCatCache(int id, Oid reloid, Oid indexoid,
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2006-06-15 04:08:09 +02:00
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int nkeys, const int *key,
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int nbuckets);
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2006-10-06 20:23:35 +02:00
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extern void InitCatCachePhase2(CatCache *cache, bool touch_index);
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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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2012-03-07 20:51:13 +01:00
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extern uint32 GetCatCacheHashValue(CatCache *cache,
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Datum v1, Datum v2,
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Datum v3, Datum v4);
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2002-04-06 08:59:25 +02:00
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extern CatCList *SearchCatCacheList(CatCache *cache, int nkeys,
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2002-09-04 22:31:48 +02:00
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Datum v1, Datum v2,
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Datum v3, Datum v4);
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2002-04-06 08:59:25 +02:00
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extern void ReleaseCatCacheList(CatCList *list);
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2001-06-18 05:35:07 +02:00
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extern void ResetCatalogCaches(void);
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2010-02-07 21:48:13 +01:00
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extern void CatalogCacheFlushCatalog(Oid catId);
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2017-05-13 00:17:29 +02:00
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extern void CatCacheInvalidate(CatCache *cache, uint32 hashValue);
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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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2011-08-17 01:27:46 +02:00
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HeapTuple newtuple,
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void (*function) (int, uint32, Oid));
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2001-10-28 07:26:15 +01:00
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2005-03-25 19:30:28 +01:00
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extern void PrintCatCacheLeakWarning(HeapTuple tuple);
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extern void PrintCatCacheListLeakWarning(CatCList *list);
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2001-11-05 18:46:40 +01:00
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#endif /* CATCACHE_H */
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