Issue - (#21): Show objects(tables) involved in the query.

PG-96

guc.c

@@ -80,14 +80,6 @@ init_guc(void)
 		.guc_max = INT_MAX,
 		.guc_restart = true
 	};
-	conf[i++] = (GucVariable) { 
-		.guc_name = "pg_stat_monitor.pgsm_object_cache",
-		.guc_desc = "Sets the maximum number of object cache",
-		.guc_default = 50,
-		.guc_min = 50,
-		.guc_max = INT_MAX,
-		.guc_restart = true
-	};
 
 	conf[i++] = (GucVariable) {
 		.guc_name = "pg_stat_monitor.pgsm_respose_time_lower_bound",
@@ -212,19 +204,6 @@ init_guc(void)
 							NULL);
 
 
-	DefineCustomIntVariable("pg_stat_monitor.pgsm_object_cache",
-							"Sets the maximum number of object cache",
-							NULL,
-							&PGSM_OBJECT_CACHE,
-							50,
-							50,
-							INT_MAX,
-							PGC_POSTMASTER,
-							0,
-							NULL,
-							NULL,
-							NULL);
-
 	DefineCustomIntVariable("pg_stat_monitor.pgsm_respose_time_lower_bound",
 							"Sets the time in millisecond.",
 							NULL,

hash_query.c

@@ -16,7 +16,6 @@
 
 static pgssSharedState *pgss;
 static HTAB *pgss_hash;
-static HTAB *pgss_object_hash;
 
 static HTAB* hash_init(const char *hash_name, int key_size, int entry_size, int hash_size);
 
@@ -40,7 +39,6 @@ pgss_startup(void)
 
 	pgss = NULL;
 	pgss_hash = NULL;
-	pgss_object_hash = NULL;
 
 	/*
 	* Create or attach to the shared memory state, including hash table
@@ -66,7 +64,6 @@ pgss_startup(void)
 	}
 
 	pgss_hash = hash_init("pg_stat_monitor: Queries hashtable", sizeof(pgssHashKey), sizeof(pgssEntry),PGSM_MAX);
-	pgss_object_hash = hash_init("pg_stat_monitor: Object hashtable", sizeof(pgssObjectHashKey), sizeof(pgssObjectEntry), PGSM_OBJECT_CACHE);
 
 	LWLockRelease(AddinShmemInitLock);
 
@@ -197,44 +194,6 @@ hash_entry_reset()
 	LWLockRelease(pgss->lock);
 }
 
-void
-hash_alloc_object_entry(uint64 queryid, char *objects)
-{
-    pgssObjectEntry *entry = NULL;
-    bool            found;
-    pgssObjectHashKey key;
-
-	LWLockAcquire(pgss->lock, LW_EXCLUSIVE);
-    key.queryid = queryid;
-    entry = (pgssObjectEntry *) hash_search(pgss_object_hash, &key, HASH_ENTER, &found);
-    if (!found)
-    {
-        SpinLockAcquire(&entry->mutex);
-        snprintf(entry->tables_name, MAX_REL_LEN, "%s", objects);
-        SpinLockRelease(&entry->mutex);
-    }
-	LWLockRelease(pgss->lock);
-}
-
-/* De-alocate memory */
-void
-hash_dealloc_object_entry(uint64 queryid, char *objects)
-{
-    pgssObjectHashKey       key;
-    pgssObjectEntry         *entry;
-
-    key.queryid = queryid;
-
-	LWLockAcquire(pgss->lock, LW_EXCLUSIVE);
-    entry = (pgssObjectEntry *) hash_search(pgss_object_hash, &key, HASH_FIND, NULL);
-    if (entry != NULL)
-    {
-        snprintf(objects, MAX_REL_LEN, "%s", entry->tables_name);
-        hash_search(pgss_object_hash, &entry->key, HASH_REMOVE, NULL);
-    }
-    LWLockRelease(pgss->lock);
-}
-
 pgssEntry*
 hash_create_query_entry(unsigned int queryid,
                         unsigned int userid,
@@ -270,7 +229,6 @@ bool
 IsHashInitialize(void)
 {
 	return (pgss != NULL &&
-			pgss_hash != NULL &&
+			pgss_hash != NULL);
-			pgss_object_hash !=NULL);
 }
 

pg_stat_monitor--1.0.sql

@@ -22,6 +22,7 @@ CREATE FUNCTION pg_stat_monitor(IN showtext boolean,
 
     OUT queryid             text,
     OUT query               text,
+	OUT relations			text,
 	OUT cmd_type			text,
 	OUT elevel              int,
     OUT sqlcode             int,
@@ -58,8 +59,7 @@ CREATE FUNCTION pg_stat_monitor(IN showtext boolean,
     OUT blk_write_time      float8,
     OUT resp_calls          text,
     OUT cpu_user_time       float8,
-    OUT cpu_sys_time        float8,
+    OUT cpu_sys_time        float8
-    OUT tables_names        text
 )
 RETURNS SETOF record
 AS 'MODULE_PATHNAME', 'pg_stat_monitor'
@@ -97,6 +97,7 @@ CREATE VIEW pg_stat_monitor AS SELECT
 	'0.0.0.0'::inet + client_ip AS client_ip,
     queryid,
     query,
+	(string_to_array(relations, ',')) relations,
 	(string_to_array(cmd_type, ',')) cmd_type,
 	elevel,
 	sqlcode,
@@ -128,8 +129,7 @@ CREATE VIEW pg_stat_monitor AS SELECT
     blk_write_time,
 	(string_to_array(resp_calls, ',')) resp_calls,
     cpu_user_time,
-    cpu_sys_time,
+    cpu_sys_time
-	(string_to_array(tables_names, ',')) tables_names
 FROM pg_stat_monitor(TRUE);
 
 CREATE FUNCTION decode_error_level(elevel int)

pg_stat_monitor.c

@@ -240,7 +240,6 @@ static void
 pgss_post_parse_analyze(ParseState *pstate, Query *query)
 {
 	pgssJumbleState jstate;
-	char			tables_name[MAX_REL_LEN] = {0};
 
 	if (prev_post_parse_analyze_hook)
 		prev_post_parse_analyze_hook(pstate, query);
@@ -264,40 +263,6 @@ pgss_post_parse_analyze(ParseState *pstate, Query *query)
 	}
 
 	query->queryId = get_query_id(&jstate, query);
-	if (query->rtable)
-	{
-		ListCell *lc;
-		bool first = true;
-		foreach(lc, query->rtable)
-		{
-			RangeTblEntry *rte = lfirst_node(RangeTblEntry, lc);
-			if (rte->rtekind == RTE_RELATION)
-			{
-				char *relname = get_rel_name(rte->relid);
-				char *relspacename = get_namespace_name(get_rel_namespace(rte->relid));
-				if (relname)
-				{
-					if (first)
-					{
-						if (relspacename)
-							snprintf(tables_name, MAX_REL_LEN, "%s.%s", relspacename, relname);
-						else
-							snprintf(tables_name, MAX_REL_LEN, "%s", relname);
-						first = false;
-					}
-					else
-					{
-						if (relspacename)
-							snprintf(tables_name, MAX_REL_LEN, "%s,%s.%s", tables_name, relspacename, relname);
-						else
-							snprintf(tables_name, MAX_REL_LEN, "%s,%s", tables_name, relname);
-					}
-				}
-			}
-		}
-		hash_alloc_object_entry(query->queryId, tables_name);
-	}
-
 	/*
 	 * If we are unlucky enough to get a hash of zero, use 1 instead, to
 	 * prevent confusion with the utility-statement case.
@@ -463,15 +428,29 @@ pgss_ExecutorCheckPerms(List *rt, bool abort)
 {
 	ListCell		*lr;
 	pgssSharedState *pgss = pgsm_get_ss();
+	int				i = 0;
+	int				j = 0;
 
 	LWLockAcquire(pgss->lock, LW_EXCLUSIVE);
 	memset(pgss->cmdTag, 0x0, sizeof(pgss->cmdTag));
 
 	foreach(lr, rt)
     {
+		bool found = false;
         RangeTblEntry *rte = lfirst(lr);
         if (rte->rtekind != RTE_RELATION)
             continue;
+
+		if (i < REL_LST)
+		{
+			for(j = 0; j < i; j++)
+			{
+				if (pgss->relations[j] == rte->relid)
+					found = true;
+			}
+			if (!found)
+				pgss->relations[i++] = rte->relid;
+		}
 		if (rte->requiredPerms & ACL_INSERT) snprintf(pgss->cmdTag[0],CMD_LEN,"%s", "INSERT");
         if (rte->requiredPerms & ACL_UPDATE) snprintf(pgss->cmdTag[1],CMD_LEN,"%s", "UPDATE");
         if (rte->requiredPerms & ACL_DELETE) snprintf(pgss->cmdTag[2],CMD_LEN,"%s", "DELETE");
@@ -748,8 +727,6 @@ static void pgss_store(uint64 queryId,
 	bool			reset = false;
 	bool			found = false;
 	int				i,j;
-	char			tables_name[MAX_REL_LEN] = {0};
-	int             len;
 	pgssSharedState *pgss = pgsm_get_ss();
 	HTAB            *pgss_hash = pgsm_get_hash();
 	int				message_len = message ? strlen(message) : 0;
@@ -800,9 +777,6 @@ static void pgss_store(uint64 queryId,
 	if (queryId == UINT64CONST(0))
 		queryId = pgss_hash_string(query, query_len);
 
-	hash_dealloc_object_entry(queryId, tables_name);
-	len = strlen(tables_name);
-
 	for (i = 0; i < CMD_LST; i++)
 		cmd_len[i] = strlen(pgss->cmdTag[i]);
 
@@ -925,6 +899,15 @@ static void pgss_store(uint64 queryId,
 				e->counters.resp_calls[MAX_RESPONSE_BUCKET - 1]++;
 		}
 
+		for (i = 0; i < REL_LST; i++)
+			if (e->counters.info.relations[i] != 0)
+				found = true;
+
+		if (!found)
+			for (i = 0; i < REL_LST; i++)
+				e->counters.info.relations[i] = pgss->relations[i];
+
+		found = false;
 		/* This is bit ugly hack to check we already updated the counter or not */
 		for (i = 0; i < CMD_LST; i++)
 			if (e->counters.info.cmd_type[i][0] != 0)
@@ -964,8 +947,6 @@ static void pgss_store(uint64 queryId,
 		e->counters.info.host = pg_get_client_addr();
 		e->counters.sysinfo.utime = utime;
 		e->counters.sysinfo.stime = stime;
-		for(i = 0; i < len; i++)
-			e->counters.info.tables_name[i] = tables_name[i];
 		SpinLockRelease(&e->mutex);
 		}
 	}
@@ -1066,7 +1047,8 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
 	{
 		Datum       values[PG_STAT_STATEMENTS_COLS];
 		bool        nulls[PG_STAT_STATEMENTS_COLS];
-		int		i = 0;
+		int		    i = 0,j;
+		int         len = 0;
 		int		    kind;
 		Counters    tmp;
 		double      stddev;
@@ -1130,6 +1112,17 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
 			else
 				nulls[i++] = true;
 		}
+
+		len = 0;
+		for (j = 0; j < REL_LST; j++)
+			if (tmp.info.relations[j] != 0)
+				len++;
+
+		if (len == 0)
+			nulls[i++] = true;
+		else
+			values[i++] = IntArrayGetTextDatum(tmp.info.relations, len);
+
 		values[i++] = TextArrayGetTextDatum(tmp.info.cmd_type, CMD_LST);
 		values[i++] = Int64GetDatumFast(tmp.error.elevel);
 		values[i++] = Int64GetDatumFast(tmp.error.sqlcode);
@@ -1169,10 +1162,6 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
 		values[i++] = IntArrayGetTextDatum(tmp.resp_calls, 10);
 		values[i++] = Float8GetDatumFast(tmp.sysinfo.utime);
 		values[i++] = Float8GetDatumFast(tmp.sysinfo.stime);
-		if (strlen(tmp.info.tables_name) == 0)
-			nulls[i++] = true;
-		else
-			values[i++] = CStringGetTextDatum(tmp.info.tables_name);
 		tuplestore_putvalues(tupstore, tupdesc, values, nulls);
 	}
 	free(query_txt);

pg_stat_monitor.h

@@ -59,9 +59,9 @@
 #define MAX_RESPONSE_BUCKET 10
 #define MAX_REL_LEN			255
 #define MAX_BUCKETS			10
-#define MAX_OBJECT_CACHE	100
 #define TEXT_LEN			255
 #define ERROR_MESSAGE_LEN	100
+#define REL_LST				10
 #define CMD_LST				10
 #define CMD_LEN				20
 
@@ -102,18 +102,6 @@ typedef enum AGG_KEY
 	AGG_KEY_HOST
 } AGG_KEY;
 
-typedef struct pgssObjectHashKey
-{
-	uint64		queryid;		/* query id */
-} pgssObjectHashKey;
-
-typedef struct pgssObjectEntry
-{
-	pgssObjectHashKey	key;						/* hash key of entry - MUST BE FIRST */
-	char				tables_name[MAX_REL_LEN];   /* table names involved in the query */
-	slock_t				mutex;						/* protects the counters only */
-} pgssObjectEntry;
-
 #define MAX_QUERY_LEN 1024
 
 /* shared nenory storage for the query */
@@ -133,8 +121,8 @@ typedef struct QueryInfo
 	Oid			dbid;						/* database OID */
 	uint		host;						/* client IP */
 	int64       type; 						/* type of query, options are query, info, warning, error, fatal */
+	int32		relations[REL_LST];
 	char		cmd_type[CMD_LST][CMD_LEN];	/* query command type SELECT/UPDATE/DELETE/INSERT */
-	char		tables_name[MAX_REL_LEN];   /* table names involved in the query */
 } QueryInfo;
 
 typedef struct ErrorInfo
@@ -220,13 +208,14 @@ typedef struct pgssSharedState
 	double			cur_median_usage;	/* current median usage in hashtable */
 	slock_t			mutex;				/* protects following fields only: */
 	Size			extent;				/* current extent of query file */
-	int				n_writers;			/* number of active writers to query file */
+	int64			n_writers;			/* number of active writers to query file */
 	uint64			current_wbucket;
 	uint64			prev_bucket_usec;
 	uint64			bucket_overflow[MAX_BUCKETS];
 	uint64			bucket_entry[MAX_BUCKETS];
-	int				query_buf_size_bucket;
+	int64			query_buf_size_bucket;
-	char			cmdTag[CMD_LST][20];
+	int32			relations[REL_LST];
+	char			cmdTag[CMD_LST][CMD_LEN];
 	Timestamp		bucket_start_time[MAX_BUCKETS];   	/* start time of the bucket */
 } pgssSharedState;
 
@@ -285,8 +274,6 @@ void init_guc(void);
 GucVariable *get_conf(int i);
 
 /* hash_create.c */
-void hash_alloc_object_entry(uint64 queryid, char *objects);
-void hash_dealloc_object_entry(uint64 queryid, char *objects);
 bool IsHashInitialize(void);
 void pgss_shmem_startup(void);
 void pgss_shmem_shutdown(int code, Datum arg);
@@ -313,10 +300,9 @@ void pgss_startup(void);
 #define PGSM_NORMALIZED_QUERY get_conf(4)->guc_variable
 #define PGSM_MAX_BUCKETS get_conf(5)->guc_variable
 #define PGSM_BUCKET_TIME get_conf(6)->guc_variable
-#define PGSM_OBJECT_CACHE get_conf(7)->guc_variable
+#define PGSM_RESPOSE_TIME_LOWER_BOUND get_conf(7)->guc_variable
-#define PGSM_RESPOSE_TIME_LOWER_BOUND get_conf(8)->guc_variable
+#define PGSM_RESPOSE_TIME_STEP get_conf(8)->guc_variable
-#define PGSM_RESPOSE_TIME_STEP get_conf(9)->guc_variable
+#define PGSM_QUERY_BUF_SIZE get_conf(9)->guc_variable
-#define PGSM_QUERY_BUF_SIZE get_conf(10)->guc_variable
+#define PGSM_TRACK_PLANNING get_conf(10)->guc_variable
-#define PGSM_TRACK_PLANNING get_conf(11)->guc_variable
 
 #endif