postgres/src/include/utils/syscache.h
Tom Lane f933766ba7 Restructure pg_opclass, pg_amop, and pg_amproc per previous discussions in
pgsql-hackers.  pg_opclass now has a row for each opclass supported by each
index AM, not a row for each opclass name.  This allows pg_opclass to show
directly whether an AM supports an opclass, and furthermore makes it possible
to store additional information about an opclass that might be AM-dependent.
pg_opclass and pg_amop now store "lossy" and "haskeytype" information that we
previously expected the user to remember to provide in CREATE INDEX commands.
Lossiness is no longer an index-level property, but is associated with the
use of a particular operator in a particular index opclass.

Along the way, IndexSupportInitialize now uses the syscaches to retrieve
pg_amop and pg_amproc entries.  I find this reduces backend launch time by
about ten percent, at the cost of a couple more special cases in catcache.c's
IndexScanOK.

Initial work by Oleg Bartunov and Teodor Sigaev, further hacking by Tom Lane.

initdb forced.
2001-08-21 16:36:06 +00:00

77 lines
2.0 KiB
C

/*-------------------------------------------------------------------------
*
* syscache.h
* System catalog cache definitions.
*
* See also lsyscache.h, which provides convenience routines for
* common cache-lookup operations.
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: syscache.h,v 1.33 2001/08/21 16:36:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef SYSCACHE_H
#define SYSCACHE_H
#include "access/htup.h"
/*
* Declarations for util/syscache.c.
*
* SysCache identifiers.
*
* The order of these must match the order
* they are entered into the structure cacheinfo[] in syscache.c.
* Keep them in alphabetical order.
*/
#define AGGNAME 0
#define AMNAME 1
#define AMOPOPID 2
#define AMOPSTRATEGY 3
#define AMPROCNUM 4
#define ATTNAME 5
#define ATTNUM 6
#define CLAAMNAME 7
#define CLAOID 8
#define GRONAME 9
#define GROSYSID 10
#define INDEXRELID 11
#define INHRELID 12
#define LANGNAME 13
#define LANGOID 14
#define OPERNAME 15
#define OPEROID 16
#define PROCNAME 17
#define PROCOID 18
#define RELNAME 19
#define RELOID 20
#define RULENAME 21
#define SHADOWNAME 22
#define SHADOWSYSID 23
#define STATRELATT 24
#define TYPENAME 25
#define TYPEOID 26
extern void InitCatalogCache(void);
extern HeapTuple SearchSysCache(int cacheId,
Datum key1, Datum key2, Datum key3, Datum key4);
extern void ReleaseSysCache(HeapTuple tuple);
/* convenience routines */
extern HeapTuple SearchSysCacheCopy(int cacheId,
Datum key1, Datum key2, Datum key3, Datum key4);
extern bool SearchSysCacheExists(int cacheId,
Datum key1, Datum key2, Datum key3, Datum key4);
extern Oid GetSysCacheOid(int cacheId,
Datum key1, Datum key2, Datum key3, Datum key4);
extern Datum SysCacheGetAttr(int cacheId, HeapTuple tup,
AttrNumber attributeNumber, bool *isNull);
#endif /* SYSCACHE_H */