A bunch of changes aimed at reducing backend startup time...

Improve 'pg_internal.init' relcache entry preload mechanism so that it is
safe to use for all system catalogs, and arrange to preload a realistic
set of system-catalog entries instead of only the three nailed-in-cache
indexes that were formerly loaded this way.  Fix mechanism for deleting
out-of-date pg_internal.init files: this must be synchronized with transaction
commit, not just done at random times within transactions.  Drive it off
relcache invalidation mechanism so that no special-case tests are needed.

Cache additional information in relcache entries for indexes (their pg_index
tuples and index-operator OIDs) to eliminate repeated lookups.  Also cache
index opclass info at the per-opclass level to avoid repeated lookups during
relcache load.

Generalize 'systable scan' utilities originally developed by Hiroshi,
move them into genam.c, use in a number of places where there was formerly
ugly code for choosing either heap or index scan.  In particular this allows
simplification of the logic that prevents infinite recursion between syscache
and relcache during startup: we can easily switch to heapscans in relcache.c
when and where needed to avoid recursion, so IndexScanOK becomes simpler and
does not need any expensive initialization.

Eliminate useless opening of a heapscan data structure while doing an indexscan
(this saves an mdnblocks call and thus at least one kernel call).

1 files changed, 8 insertions, 1 deletions

diff --git a/src/include/utils/catcache.h b/src/include/utils/catcache.h
index de5957441a..6ad0d74851 100644
--- a/src/include/utils/catcache.h
+++ b/src/include/utils/catcache.h
@@ -13,7 +13,7 @@
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: catcache.h,v 1.37 2001/11/05 17:46:36 momjian Exp $
+ * $Id: catcache.h,v 1.38 2002/02/19 20:11:19 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -44,6 +44,12 @@ typedef struct catcache
 	int			cc_key[4];		/* AttrNumber of each key */
 	PGFunction	cc_hashfunc[4]; /* hash function to use for each key */
 	ScanKeyData cc_skey[4];		/* precomputed key info for heap scans */
+#ifdef CATCACHE_STATS
+	long		cc_searches;	/* total # searches against this cache */
+	long		cc_hits;		/* # of matches against existing entry */
+	long		cc_newloads;	/* # of successful loads of new entry */
+	/* cc_searches - (cc_hits + cc_newloads) is # of failed searches */
+#endif
 	Dllist		cc_bucket[1];	/* hash buckets --- VARIABLE LENGTH ARRAY */
 } CatCache;						/* VARIABLE LENGTH STRUCT */
 
@@ -89,6 +95,7 @@ extern void AtEOXact_CatCache(bool isCommit);
 extern CatCache *InitCatCache(int id, char *relname, char *indname,
 			 int reloidattr,
 			 int nkeys, int *key);
+extern void InitCatCachePhase2(CatCache *cache);
 
 extern HeapTuple SearchCatCache(CatCache *cache,
 			   Datum v1, Datum v2,