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https://github.com/postgres/postgres.git
synced 2025-07-02 09:02:37 +03:00
Do some restructuring to improve performance of the catcaches. Teach
CatalogCacheFlushRelation (formerly called SystemCacheRelationFlushed) how to distinguish tuples it should flush from those it needn't; this means a relcache flush event now only removes the catcache entries it ought to, rather than zapping the caches completely as it used to. Testing with the regression tests indicates that this considerably improves the lifespan of catcache entries. Also, rearrange catcache data structures so that the limit on number of cached tuples applies globally across all the catcaches, rather than being per-catcache. It was a little silly to have the same size limit on both, say, pg_attribute caches and pg_am caches (there being only four possible rows in the latter...). Doing LRU removal across all the caches instead of locally in each one should reduce cache reload traffic in the more heavily used caches and improve the efficiency of cache memory use.
This commit is contained in:
Tom Lane
41
src/backend/utils/cache/syscache.c
vendored
41
src/backend/utils/cache/syscache.c
vendored
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.62 2001/06/12 05:55:49 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/cache/syscache.c,v 1.63 2001/06/18 03:35:07 tgl Exp $
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*
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* NOTES
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* These routines allow the parser/planner/executor to perform
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@ -54,7 +54,12 @@
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Add your entry to the cacheinfo[] array below. All cache lists are
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alphabetical, so add it in the proper place. Specify the relation
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name, index name, number of keys, and key attribute numbers.
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name, index name, number of keys, and key attribute numbers. If the
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relation contains tuples that are associated with a particular relation
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(for example, its attributes, rules, triggers, etc) then specify the
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attribute number that contains the OID of the associated relation.
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This is used by CatalogCacheFlushRelation() to remove the correct
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tuples during a table drop or relcache invalidation event.
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In include/catalog/indexing.h, add a define for the number of indexes
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on the relation, add define(s) for the index name(s), add an extern
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@ -76,12 +81,12 @@
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/*
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* struct cachedesc: information defining a single syscache
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*
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*/
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struct cachedesc
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{
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char *name; /* name of the relation being cached */
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char *indname; /* name of index relation for this cache */
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int reloidattr; /* attr number of rel OID reference, or 0 */
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int nkeys; /* # of keys needed for cache lookup */
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int key[4]; /* attribute numbers of key attrs */
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};
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@ -89,6 +94,7 @@ struct cachedesc
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static struct cachedesc cacheinfo[] = {
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{AggregateRelationName, /* AGGNAME */
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AggregateNameTypeIndex,
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0,
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2,
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{
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Anum_pg_aggregate_aggname,
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@ -98,6 +104,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{AccessMethodRelationName, /* AMNAME */
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AmNameIndex,
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0,
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1,
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{
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Anum_pg_am_amname,
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@ -107,6 +114,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{AccessMethodOperatorRelationName, /* AMOPOPID */
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AccessMethodOpidIndex,
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0,
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3,
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{
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Anum_pg_amop_amopclaid,
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@ -116,6 +124,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{AccessMethodOperatorRelationName, /* AMOPSTRATEGY */
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AccessMethodStrategyIndex,
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0,
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3,
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{
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Anum_pg_amop_amopid,
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@ -125,6 +134,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{AttributeRelationName, /* ATTNAME */
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AttributeRelidNameIndex,
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Anum_pg_attribute_attrelid,
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2,
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{
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Anum_pg_attribute_attrelid,
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@ -134,6 +144,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{AttributeRelationName, /* ATTNUM */
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AttributeRelidNumIndex,
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Anum_pg_attribute_attrelid,
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2,
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{
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Anum_pg_attribute_attrelid,
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@ -143,6 +154,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{OperatorClassRelationName, /* CLADEFTYPE */
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OpclassDeftypeIndex,
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0,
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1,
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{
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Anum_pg_opclass_opcdeftype,
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@ -152,6 +164,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{OperatorClassRelationName, /* CLANAME */
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OpclassNameIndex,
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0,
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1,
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{
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Anum_pg_opclass_opcname,
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@ -161,6 +174,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{GroupRelationName, /* GRONAME */
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GroupNameIndex,
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0,
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1,
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{
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Anum_pg_group_groname,
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@ -170,6 +184,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{GroupRelationName, /* GROSYSID */
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GroupSysidIndex,
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0,
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1,
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{
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Anum_pg_group_grosysid,
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@ -179,6 +194,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{IndexRelationName, /* INDEXRELID */
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IndexRelidIndex,
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Anum_pg_index_indrelid,
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1,
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{
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Anum_pg_index_indexrelid,
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@ -188,6 +204,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{InheritsRelationName, /* INHRELID */
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InheritsRelidSeqnoIndex,
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Anum_pg_inherits_inhrelid,
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2,
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{
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Anum_pg_inherits_inhrelid,
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@ -197,6 +214,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{LanguageRelationName, /* LANGNAME */
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LanguageNameIndex,
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0,
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1,
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{
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Anum_pg_language_lanname,
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@ -206,6 +224,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{LanguageRelationName, /* LANGOID */
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LanguageOidIndex,
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0,
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1,
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{
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ObjectIdAttributeNumber,
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@ -215,6 +234,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{OperatorRelationName, /* OPERNAME */
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OperatorNameIndex,
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0,
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4,
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{
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Anum_pg_operator_oprname,
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@ -224,6 +244,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{OperatorRelationName, /* OPEROID */
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OperatorOidIndex,
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0,
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1,
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{
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ObjectIdAttributeNumber,
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@ -233,6 +254,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{ProcedureRelationName, /* PROCNAME */
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ProcedureNameIndex,
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0,
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3,
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{
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Anum_pg_proc_proname,
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@ -242,6 +264,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{ProcedureRelationName, /* PROCOID */
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ProcedureOidIndex,
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0,
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1,
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{
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ObjectIdAttributeNumber,
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@ -251,6 +274,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{RelationRelationName, /* RELNAME */
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ClassNameIndex,
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ObjectIdAttributeNumber,
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1,
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{
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Anum_pg_class_relname,
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@ -260,6 +284,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{RelationRelationName, /* RELOID */
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ClassOidIndex,
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ObjectIdAttributeNumber,
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1,
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{
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ObjectIdAttributeNumber,
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@ -269,6 +294,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{RewriteRelationName, /* RULENAME */
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RewriteRulenameIndex,
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Anum_pg_rewrite_ev_class,
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1,
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{
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Anum_pg_rewrite_rulename,
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@ -278,6 +304,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{ShadowRelationName, /* SHADOWNAME */
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ShadowNameIndex,
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0,
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1,
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{
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Anum_pg_shadow_usename,
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@ -287,6 +314,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{ShadowRelationName, /* SHADOWSYSID */
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ShadowSysidIndex,
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0,
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1,
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{
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Anum_pg_shadow_usesysid,
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@ -296,6 +324,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{StatisticRelationName, /* STATRELATT */
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StatisticRelidAttnumIndex,
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Anum_pg_statistic_starelid,
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2,
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{
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Anum_pg_statistic_starelid,
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@ -305,6 +334,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{TypeRelationName, /* TYPENAME */
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TypeNameIndex,
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Anum_pg_type_typrelid,
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1,
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{
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Anum_pg_type_typname,
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@ -314,6 +344,7 @@ static struct cachedesc cacheinfo[] = {
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}},
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{TypeRelationName, /* TYPEOID */
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TypeOidIndex,
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Anum_pg_type_typrelid,
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1,
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{
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ObjectIdAttributeNumber,
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@ -323,8 +354,7 @@ static struct cachedesc cacheinfo[] = {
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}}
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};
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static CatCache *SysCache[
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lengthof(cacheinfo)];
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static CatCache *SysCache[lengthof(cacheinfo)];
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static int SysCacheSize = lengthof(cacheinfo);
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static bool CacheInitialized = false;
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@ -358,6 +388,7 @@ InitCatalogCache(void)
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SysCache[cacheId] = InitCatCache(cacheId,
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cacheinfo[cacheId].name,
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cacheinfo[cacheId].indname,
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cacheinfo[cacheId].reloidattr,
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cacheinfo[cacheId].nkeys,
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cacheinfo[cacheId].key);
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if (!PointerIsValid(SysCache[cacheId]))
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