X-Git-Url: http://www.sigaev.ru/git/gitweb.cgi?p=plantuner.git;a=blobdiff_plain;f=plantuner.c;h=0fa907af6691cba495d94a2cbb093376b2fb92da;hp=bf3c511b0c923a0307f3202bd2e24add7973a1e2;hb=7a05bfc851d3739b4b47871b65e868760212a850;hpb=4658687fa586302f46026d1405b36a3fdac87612

diff --git a/plantuner.c b/plantuner.c
index bf3c511..0fa907a 100644
--- a/plantuner.c
+++ b/plantuner.c
@@ -6,13 +6,13 @@
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
- *        notice, this list of conditions and the following disclaimer.
+ *		notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
- *        notice, this list of conditions and the following disclaimer in the
- *        documentation and/or other materials provided with the distribution.
+ *		notice, this list of conditions and the following disclaimer in the
+ *		documentation and/or other materials provided with the distribution.
  * 3. Neither the name of the author nor the names of any co-contributors
- *        may be used to endorse or promote products derived from this software
- *        without specific prior written permission.
+ *		may be used to endorse or promote products derived from this software
+ *		without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
@@ -30,28 +30,45 @@
 #include <postgres.h>
 
 #include <fmgr.h>
+#include <miscadmin.h>
+#include <access/heapam.h>
+#include <access/xact.h>
 #include <catalog/namespace.h>
 #include <catalog/pg_class.h>
 #include <nodes/pg_list.h>
 #include <optimizer/plancat.h>
+#include <storage/bufmgr.h>
 #include <utils/builtins.h>
 #include <utils/guc.h>
 #include <utils/lsyscache.h>
+#include <utils/rel.h>
+#if PG_VERSION_NUM >= 100000
+#include <utils/regproc.h>
+#include <utils/varlena.h>
+#endif
 
 PG_MODULE_MAGIC;
 
-static int 	nIndexesOut = 0;
-static Oid	*indexesOut = NULL;
+static int	nDisabledIndexes = 0;
+static Oid	*disabledIndexes = NULL;
+static char *disableIndexesOutStr = "";
+
+static int	nEnabledIndexes = 0;
+static Oid	*enabledIndexes = NULL;
+static char *enableIndexesOutStr = "";
+
 get_relation_info_hook_type	prevHook = NULL;
+static bool	fix_empty_table = false;
 
-static char *indexesOutStr = "";
+static bool	plantuner_enable_inited = false;
+static bool	plantuner_disable_inited = false;
 
 static const char *
-indexesOutAssign(const char * newval, bool doit, GucSource source) 
+indexesAssign(const char * newval, bool doit, GucSource source, bool isDisable)
 {
-	char       *rawname;
-	List       *namelist;
-	ListCell   *l;
+	char		*rawname;
+	List		*namelist;
+	ListCell	*l;
 	Oid			*newOids = NULL;
 	int			nOids = 0,
 				i = 0;
@@ -61,27 +78,63 @@ indexesOutAssign(const char * newval, bool doit, GucSource source)
 	if (!SplitIdentifierString(rawname, ',', &namelist))
 		goto cleanup;
 
-	if (doit) 
+	/*
+	 * follow work could be done only in normal processing because of
+	 * accsess to system catalog
+	 */
+	if (MyBackendId == InvalidBackendId || !IsUnderPostmaster ||
+		!IsTransactionState())
+	{
+		/* reset init state */
+		if (isDisable)
+			plantuner_disable_inited = false;
+		else
+			plantuner_enable_inited = false;
+
+		return newval;
+	}
+
+	if (doit)
 	{
 		nOids = list_length(namelist);
 		newOids = malloc(sizeof(Oid) * (nOids+1));
 		if (!newOids)
-			elog(ERROR,"could not allocate %d bytes", sizeof(Oid) * (nOids+1));
+			elog(ERROR,"could not allocate %d bytes",
+				 (int)(sizeof(Oid) * (nOids+1)));
 	}
 
+	if (isDisable)
+		plantuner_disable_inited = true;
+	else
+		plantuner_enable_inited = true;
+
 	foreach(l, namelist)
 	{
-		char     	*curname = (char *) lfirst(l);
-		Oid			indexOid = RangeVarGetRelid(makeRangeVarFromNameList(stringToQualifiedNameList(curname)), true);
+		char	*curname = (char *) lfirst(l);
+#if PG_VERSION_NUM >= 90200
+		Oid		indexOid = RangeVarGetRelid(
+				makeRangeVarFromNameList(stringToQualifiedNameList(curname)),
+											NoLock, true);
+#else
+		Oid		indexOid = RangeVarGetRelid(
+				makeRangeVarFromNameList(stringToQualifiedNameList(curname)),
+											true);
+#endif
 
 		if (indexOid == InvalidOid)
 		{
-			elog(WARNING,"'%s' does not exist", curname);
+#if PG_VERSION_NUM >= 90100
+			if (doit == false)
+#endif
+				elog(WARNING,"'%s' does not exist", curname);
 			continue;
 		}
 		else if ( get_rel_relkind(indexOid) != RELKIND_INDEX )
 		{
-			elog(WARNING,"'%s' is not an index", curname);
+#if PG_VERSION_NUM >= 90100
+			if (doit == false)
+#endif
+				elog(WARNING,"'%s' is not an index", curname);
 			continue;
 		}
 		else if (doit)
@@ -90,10 +143,22 @@ indexesOutAssign(const char * newval, bool doit, GucSource source)
 		}
 	}
 
-	if (doit) 
+	if (doit)
 	{
-		nIndexesOut = nOids;
-		indexesOut = newOids;
+		if (isDisable)
+		{
+			nDisabledIndexes = i;
+			if (disabledIndexes)
+				free(disabledIndexes);
+			disabledIndexes = newOids;
+		}
+		else
+		{
+			nEnabledIndexes = i;
+			if (enabledIndexes)
+				free(enabledIndexes);
+			enabledIndexes = newOids;
+		}
 	}
 
 	pfree(rawname);
@@ -109,12 +174,84 @@ cleanup:
 	return NULL;
 }
 
+static const char *
+assignDisabledIndexes(const char * newval, bool doit, GucSource source)
+{
+	return indexesAssign(newval, doit, source, true);
+}
+
+static const char *
+assignEnabledIndexes(const char * newval, bool doit, GucSource source)
+{
+	return indexesAssign(newval, doit, source, false);
+}
+
+static void
+lateInit()
+{
+	if (!plantuner_enable_inited)
+		indexesAssign(enableIndexesOutStr, true, PGC_S_USER, false);
+	if (!plantuner_disable_inited)
+		indexesAssign(disableIndexesOutStr, true, PGC_S_USER, true);
+}
+
+#if PG_VERSION_NUM >= 90100
+
+static bool
+checkDisabledIndexes(char **newval, void **extra, GucSource source)
+{
+	char *val;
+
+	val = (char*)indexesAssign(*newval, false, source, true);
+
+	if (val)
+	{
+		*newval = val;
+		return true;
+	}
+
+	return false;
+}
+
+static bool
+checkEnabledIndexes(char **newval, void **extra, GucSource source)
+{
+	char *val;
+
+	val = (char*)indexesAssign(*newval, false, source, false);
+
+	if (val)
+	{
+		*newval = val;
+		return true;
+	}
+
+	return false;
+}
 
 static void
-indexFilter(PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo *rel) {
+assignDisabledIndexesNew(const char *newval, void *extra)
+{
+	assignDisabledIndexes(newval, true, PGC_S_USER /* doesn't matter */);
+}
+
+static void
+assignEnabledIndexesNew(const char *newval, void *extra)
+{
+	assignEnabledIndexes(newval, true, PGC_S_USER /* doesn't matter */);
+}
+
+#endif
+
+static void
+indexFilter(PlannerInfo *root, Oid relationObjectId, bool inhparent,
+			RelOptInfo *rel)
+{
 	int i;
 
-	for(i=0;i<nIndexesOut;i++)
+	lateInit();
+
+	for(i=0;i<nDisabledIndexes;i++)
 	{
 		ListCell   *l;
 
@@ -122,37 +259,71 @@ indexFilter(PlannerInfo *root, Oid relationObjectId, bool inhparent, RelOptInfo
 		{
 			IndexOptInfo	*info = (IndexOptInfo*)lfirst(l);
 
-			if (indexesOut[i] == info->indexoid)
+			if (disabledIndexes[i] == info->indexoid)
 			{
-				rel->indexlist = list_delete_ptr(rel->indexlist, info);
+				int j;
+
+				for(j=0; j<nEnabledIndexes; j++)
+					if (enabledIndexes[j] == info->indexoid)
+						break;
+
+				if (j >= nEnabledIndexes)
+					rel->indexlist = list_delete_ptr(rel->indexlist, info);
+
 				break;
 			}
 		}
 	}
+}
+
+static void
+execPlantuner(PlannerInfo *root, Oid relationObjectId, bool inhparent,
+			  RelOptInfo *rel)
+{
+	Relation	relation;
+
+	relation = heap_open(relationObjectId, NoLock);
+	if (relation->rd_rel->relkind == RELKIND_RELATION)
+	{
+		if (fix_empty_table && RelationGetNumberOfBlocks(relation) == 0)
+		{
+			/*
+			 * estimate_rel_size() could be too pessimistic for particular
+			 * workload
+			 */
+			rel->pages = 0.0;
+			rel->tuples = 0.0;
+		}
+
+		indexFilter(root, relationObjectId, inhparent, rel);
+	}
+	heap_close(relation, NoLock);
 
 	/*
-	 * Call next hook if it exists 
+	 * Call next hook if it exists
 	 */
 	if (prevHook)
 		prevHook(root, relationObjectId, inhparent, rel);
 }
 
 static const char*
-IndexFilterShow(void) 
+IndexFilterShow(Oid* indexes, int nIndexes)
 {
-	char 	*val, *ptr;
-	int 	i,
+	char	*val, *ptr;
+	int		i,
 			len;
 
-	len = 1 /* \0 */ + nIndexesOut * (2 * NAMEDATALEN + 2 /* ', ' */ + 1 /* . */);
+	lateInit();
+
+	len = 1 /* \0 */ + nIndexes * (2 * NAMEDATALEN + 2 /* ', ' */ + 1 /* . */);
 	ptr = val = palloc(len);
 
-	*ptr ='\0';
-	for(i=0; i<nIndexesOut; i++)
+	*ptr =(char)'\0';
+	for(i=0; i<nIndexes; i++)
 	{
-		char 	*relname = get_rel_name(indexesOut[i]);
-		Oid 	nspOid = get_rel_namespace(indexesOut[i]);
-		char 	*nspname = get_namespace_name(nspOid); 
+		char	*relname = get_rel_name(indexes[i]);
+		Oid		nspOid = get_rel_namespace(indexes[i]);
+		char	*nspname = get_namespace_name(nspOid);
 
 		if ( relname == NULL || nspOid == InvalidOid || nspname == NULL )
 			continue;
@@ -166,25 +337,95 @@ IndexFilterShow(void)
 	return val;
 }
 
+static const char*
+disabledIndexFilterShow(void)
+{
+	return IndexFilterShow(disabledIndexes, nDisabledIndexes);
+}
+
+static const char*
+enabledIndexFilterShow(void)
+{
+	return IndexFilterShow(enabledIndexes, nEnabledIndexes);
+}
+
 void _PG_init(void);
 void
-_PG_init(void) 
+_PG_init(void)
 {
-    DefineCustomStringVariable(
+	DefineCustomStringVariable(
 		"plantuner.forbid_index",
-		"List of forbidden indexes",
+		"List of forbidden indexes (deprecated)",
+		"Listed indexes will not be used in queries (deprecated, use plantuner.disable_index)",
+		&disableIndexesOutStr,
+		"",
+		PGC_USERSET,
+		0,
+#if PG_VERSION_NUM >= 90100
+		checkDisabledIndexes,
+		assignDisabledIndexesNew,
+#else
+		assignDisabledIndexes,
+#endif
+		disabledIndexFilterShow
+	);
+
+	DefineCustomStringVariable(
+		"plantuner.disable_index",
+		"List of disabled indexes",
 		"Listed indexes will not be used in queries",
-		&indexesOutStr,
+		&disableIndexesOutStr,
+		"",
+		PGC_USERSET,
+		0,
+#if PG_VERSION_NUM >= 90100
+		checkDisabledIndexes,
+		assignDisabledIndexesNew,
+#else
+		assignDisabledIndexes,
+#endif
+		disabledIndexFilterShow
+	);
+
+	DefineCustomStringVariable(
+		"plantuner.enable_index",
+		"List of enabled indexes (overload plantuner.disable_index)",
+		"Listed indexes which could be used in queries even they are listed in plantuner.disable_index",
+		&enableIndexesOutStr,
 		"",
 		PGC_USERSET,
 		0,
-		indexesOutAssign,
-		IndexFilterShow
+#if PG_VERSION_NUM >= 90100
+		checkEnabledIndexes,
+		assignEnabledIndexesNew,
+#else
+		assignEnabledIndexes,
+#endif
+		enabledIndexFilterShow
+	);
+
+	DefineCustomBoolVariable(
+		"plantuner.fix_empty_table",
+		"Sets to zero estimations for empty tables",
+		"Sets to zero estimations for empty or newly created tables",
+		&fix_empty_table,
+#if PG_VERSION_NUM >= 80400
+		fix_empty_table,
+#endif
+		PGC_USERSET,
+#if PG_VERSION_NUM >= 80400
+		GUC_NOT_IN_SAMPLE,
+#if PG_VERSION_NUM >= 90100
+		NULL,
+#endif
+#endif
+		NULL,
+		NULL
 	);
 
-	if (get_relation_info_hook != indexFilter )
+	if (get_relation_info_hook != execPlantuner )
 	{
 		prevHook = get_relation_info_hook;
-		get_relation_info_hook = indexFilter;
+		get_relation_info_hook = execPlantuner;
 	}
 }