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Amit Kapila
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Extend pg_stat_statements_reset to reset statistics specific to a
particular user/db/query. The function pg_stat_statements_reset() is extended to accept userid, dbid, and queryid as input parameters. Now, it can discard the statistics gathered so far by pg_stat_statements corresponding to the specified userid, dbid, and queryid. If no parameter is specified or all the specified parameters have default value aka 0, it will discard all statistics as per the old behavior. The new behavior is useful to get the fresh statistics for a specific user/database/query without resetting all the existing statistics. Author: Haribabu Kommi, with few additional changes by me Reviewed-by: Michael Paquier, Amit Kapila and Fujii Masao Discussion: https://postgr.es/m/CAJrrPGcyh-gkFswyc6C661K6cknL0XkNqVT0sQt2mFNMR4HRKA@mail.gmail.com
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-41
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7 files changed

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‎contrib/pg_stat_statements/Makefile‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -4,10 +4,10 @@ MODULE_big = pg_stat_statements
44
OBJS = pg_stat_statements.o $(WIN32RES)
55

66
EXTENSION = pg_stat_statements
7-
DATA = pg_stat_statements--1.4.sql pg_stat_statements--1.5--1.6.sql \
8-
pg_stat_statements--1.4--1.5.sql pg_stat_statements--1.3--1.4.sql \
9-
pg_stat_statements--1.2--1.3.sql pg_stat_statements--1.1--1.2.sql \
10-
pg_stat_statements--1.0--1.1.sql \
7+
DATA = pg_stat_statements--1.4.sql pg_stat_statements--1.6--1.7.sql \
8+
pg_stat_statements--1.5--1.6.sql pg_stat_statements--1.4--1.5.sql \
9+
pg_stat_statements--1.3--1.4.sql pg_stat_statements--1.2--1.3.sql \
10+
pg_stat_statements--1.1--1.2.sql pg_stat_statements--1.0--1.1.sql \
1111
pg_stat_statements--unpackaged--1.0.sql
1212
PGFILEDESC = "pg_stat_statements - execution statistics of SQL statements"
1313

‎contrib/pg_stat_statements/expected/pg_stat_statements.out‎

Lines changed: 198 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -395,4 +395,202 @@ SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
395395
SELECT pg_stat_statements_reset() | 1 | 1
396396
(8 rows)
397397

398+
--
399+
-- Track user activity and reset them
400+
--
401+
SELECT pg_stat_statements_reset();
402+
pg_stat_statements_reset
403+
--------------------------
404+
405+
(1 row)
406+
407+
CREATE ROLE regress_stats_user1;
408+
CREATE ROLE regress_stats_user2;
409+
SET ROLE regress_stats_user1;
410+
SELECT 1 AS "ONE";
411+
ONE
412+
-----
413+
1
414+
(1 row)
415+
416+
SELECT 1+1 AS "TWO";
417+
TWO
418+
-----
419+
2
420+
(1 row)
421+
422+
RESET ROLE;
423+
SET ROLE regress_stats_user2;
424+
SELECT 1 AS "ONE";
425+
ONE
426+
-----
427+
1
428+
(1 row)
429+
430+
SELECT 1+1 AS "TWO";
431+
TWO
432+
-----
433+
2
434+
(1 row)
435+
436+
RESET ROLE;
437+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
438+
query | calls | rows
439+
-----------------------------------+-------+------
440+
CREATE ROLE regress_stats_user1 | 1 | 0
441+
CREATE ROLE regress_stats_user2 | 1 | 0
442+
RESET ROLE | 2 | 0
443+
SELECT $1 AS "ONE" | 1 | 1
444+
SELECT $1 AS "ONE" | 1 | 1
445+
SELECT $1+$2 AS "TWO" | 1 | 1
446+
SELECT $1+$2 AS "TWO" | 1 | 1
447+
SELECT pg_stat_statements_reset() | 1 | 1
448+
SET ROLE regress_stats_user1 | 1 | 0
449+
SET ROLE regress_stats_user2 | 1 | 0
450+
(10 rows)
451+
452+
--
453+
-- Don't reset anything if any of the parameter is NULL
454+
--
455+
SELECT pg_stat_statements_reset(NULL);
456+
pg_stat_statements_reset
457+
--------------------------
458+
459+
(1 row)
460+
461+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
462+
query | calls | rows
463+
------------------------------------------------------------------------------+-------+------
464+
CREATE ROLE regress_stats_user1 | 1 | 0
465+
CREATE ROLE regress_stats_user2 | 1 | 0
466+
RESET ROLE | 2 | 0
467+
SELECT $1 AS "ONE" | 1 | 1
468+
SELECT $1 AS "ONE" | 1 | 1
469+
SELECT $1+$2 AS "TWO" | 1 | 1
470+
SELECT $1+$2 AS "TWO" | 1 | 1
471+
SELECT pg_stat_statements_reset($1) | 1 | 1
472+
SELECT pg_stat_statements_reset() | 1 | 1
473+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C" | 1 | 10
474+
SET ROLE regress_stats_user1 | 1 | 0
475+
SET ROLE regress_stats_user2 | 1 | 0
476+
(12 rows)
477+
478+
--
479+
-- remove query ('SELECT $1+$2 AS "TWO"') executed by regress_stats_user2
480+
-- in the current_database
481+
--
482+
SELECT pg_stat_statements_reset(
483+
(SELECT r.oid FROM pg_roles AS r WHERE r.rolname = 'regress_stats_user2'),
484+
(SELECT d.oid FROM pg_database As d where datname = current_database()),
485+
(SELECT s.queryid FROM pg_stat_statements AS s
486+
WHERE s.query = 'SELECT $1+$2 AS "TWO"' LIMIT 1));
487+
pg_stat_statements_reset
488+
--------------------------
489+
490+
(1 row)
491+
492+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
493+
query | calls | rows
494+
----------------------------------------------------------------------------------+-------+------
495+
CREATE ROLE regress_stats_user1 | 1 | 0
496+
CREATE ROLE regress_stats_user2 | 1 | 0
497+
RESET ROLE | 2 | 0
498+
SELECT $1 AS "ONE" | 1 | 1
499+
SELECT $1 AS "ONE" | 1 | 1
500+
SELECT $1+$2 AS "TWO" | 1 | 1
501+
SELECT pg_stat_statements_reset( +| 1 | 1
502+
(SELECT r.oid FROM pg_roles AS r WHERE r.rolname = $1), +| |
503+
(SELECT d.oid FROM pg_database As d where datname = current_database()),+| |
504+
(SELECT s.queryid FROM pg_stat_statements AS s +| |
505+
WHERE s.query = $2 LIMIT $3)) | |
506+
SELECT pg_stat_statements_reset($1) | 1 | 1
507+
SELECT pg_stat_statements_reset() | 1 | 1
508+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C" | 2 | 22
509+
SET ROLE regress_stats_user1 | 1 | 0
510+
SET ROLE regress_stats_user2 | 1 | 0
511+
(12 rows)
512+
513+
--
514+
-- remove query ('SELECT $1 AS "ONE"') executed by two users
515+
--
516+
SELECT pg_stat_statements_reset(0,0,s.queryid)
517+
FROM pg_stat_statements AS s WHERE s.query = 'SELECT $1 AS "ONE"';
518+
pg_stat_statements_reset
519+
--------------------------
520+
521+
522+
(2 rows)
523+
524+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
525+
query | calls | rows
526+
----------------------------------------------------------------------------------+-------+------
527+
CREATE ROLE regress_stats_user1 | 1 | 0
528+
CREATE ROLE regress_stats_user2 | 1 | 0
529+
RESET ROLE | 2 | 0
530+
SELECT $1+$2 AS "TWO" | 1 | 1
531+
SELECT pg_stat_statements_reset( +| 1 | 1
532+
(SELECT r.oid FROM pg_roles AS r WHERE r.rolname = $1), +| |
533+
(SELECT d.oid FROM pg_database As d where datname = current_database()),+| |
534+
(SELECT s.queryid FROM pg_stat_statements AS s +| |
535+
WHERE s.query = $2 LIMIT $3)) | |
536+
SELECT pg_stat_statements_reset($1) | 1 | 1
537+
SELECT pg_stat_statements_reset($1,$2,s.queryid) +| 1 | 2
538+
FROM pg_stat_statements AS s WHERE s.query = $3 | |
539+
SELECT pg_stat_statements_reset() | 1 | 1
540+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C" | 3 | 34
541+
SET ROLE regress_stats_user1 | 1 | 0
542+
SET ROLE regress_stats_user2 | 1 | 0
543+
(11 rows)
544+
545+
--
546+
-- remove query of a user (regress_stats_user1)
547+
--
548+
SELECT pg_stat_statements_reset(r.oid)
549+
FROM pg_roles AS r WHERE r.rolname = 'regress_stats_user1';
550+
pg_stat_statements_reset
551+
--------------------------
552+
553+
(1 row)
554+
555+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
556+
query | calls | rows
557+
----------------------------------------------------------------------------------+-------+------
558+
CREATE ROLE regress_stats_user1 | 1 | 0
559+
CREATE ROLE regress_stats_user2 | 1 | 0
560+
RESET ROLE | 2 | 0
561+
SELECT pg_stat_statements_reset( +| 1 | 1
562+
(SELECT r.oid FROM pg_roles AS r WHERE r.rolname = $1), +| |
563+
(SELECT d.oid FROM pg_database As d where datname = current_database()),+| |
564+
(SELECT s.queryid FROM pg_stat_statements AS s +| |
565+
WHERE s.query = $2 LIMIT $3)) | |
566+
SELECT pg_stat_statements_reset($1) | 1 | 1
567+
SELECT pg_stat_statements_reset($1,$2,s.queryid) +| 1 | 2
568+
FROM pg_stat_statements AS s WHERE s.query = $3 | |
569+
SELECT pg_stat_statements_reset() | 1 | 1
570+
SELECT pg_stat_statements_reset(r.oid) +| 1 | 1
571+
FROM pg_roles AS r WHERE r.rolname = $1 | |
572+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C" | 4 | 45
573+
SET ROLE regress_stats_user2 | 1 | 0
574+
(10 rows)
575+
576+
--
577+
-- reset all
578+
--
579+
SELECT pg_stat_statements_reset(0,0,0);
580+
pg_stat_statements_reset
581+
--------------------------
582+
583+
(1 row)
584+
585+
SELECT query, calls, rows FROM pg_stat_statements ORDER BY query COLLATE "C";
586+
query | calls | rows
587+
----------------------------------------+-------+------
588+
SELECT pg_stat_statements_reset(0,0,0) | 1 | 1
589+
(1 row)
590+
591+
--
592+
-- cleanup
593+
--
594+
DROP ROLE regress_stats_user1;
595+
DROP ROLE regress_stats_user2;
398596
DROP EXTENSION pg_stat_statements;

‎contrib/pg_stat_statements/pg_stat_statements--1.6--1.7.sql‎

Lines changed: 22 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,22 @@
1+
/* contrib/pg_stat_statements/pg_stat_statements--1.6--1.7.sql */
2+
3+
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
4+
\echo Use "ALTER EXTENSION pg_stat_statements UPDATE TO '1.7'" to load this file. \quit
5+
6+
/* First we have to remove them from the extension */
7+
ALTER EXTENSION pg_stat_statements DROP FUNCTION pg_stat_statements_reset();
8+
9+
/* Then we can drop them */
10+
DROP FUNCTION pg_stat_statements_reset();
11+
12+
/* Now redefine */
13+
CREATE FUNCTION pg_stat_statements_reset(IN userid Oid DEFAULT 0,
14+
IN dbid Oid DEFAULT 0,
15+
IN queryid bigint DEFAULT 0
16+
)
17+
RETURNS void
18+
AS 'MODULE_PATHNAME', 'pg_stat_statements_reset_1_7'
19+
LANGUAGE C STRICT PARALLEL SAFE;
20+
21+
-- Don't want this to be available to non-superusers.
22+
REVOKE ALL ON FUNCTION pg_stat_statements_reset(Oid, Oid, bigint) FROM PUBLIC;

‎contrib/pg_stat_statements/pg_stat_statements.c‎

Lines changed: 84 additions & 12 deletions
Original file line numberDiff line numberDiff line change
@@ -290,6 +290,7 @@ void _PG_init(void);
290290
void _PG_fini(void);
291291

292292
PG_FUNCTION_INFO_V1(pg_stat_statements_reset);
293+
PG_FUNCTION_INFO_V1(pg_stat_statements_reset_1_7);
293294
PG_FUNCTION_INFO_V1(pg_stat_statements_1_2);
294295
PG_FUNCTION_INFO_V1(pg_stat_statements_1_3);
295296
PG_FUNCTION_INFO_V1(pg_stat_statements);
@@ -327,7 +328,7 @@ static char *qtext_fetch(Size query_offset, int query_len,
327328
char *buffer, Size buffer_size);
328329
static bool need_gc_qtexts(void);
329330
static void gc_qtexts(void);
330-
static void entry_reset(void);
331+
static void entry_reset(Oid userid, Oid dbid, uint64 queryid);
331332
static void AppendJumble(pgssJumbleState *jstate,
332333
const unsigned char *item, Size size);
333334
static void JumbleQuery(pgssJumbleState *jstate, Query *query);
@@ -1148,8 +1149,17 @@ pgss_store(const char *query, uint64 queryId,
11481149
* For utility statements, we just hash the query string to get an ID.
11491150
*/
11501151
if (queryId == UINT64CONST(0))
1152+
{
11511153
queryId = pgss_hash_string(query, query_len);
11521154

1155+
/*
1156+
* If we are unlucky enough to get a hash of zero(invalid), use queryID
1157+
* as 2 instead, queryID 1 is already in use for normal statements.
1158+
*/
1159+
if (queryId == UINT64CONST(0))
1160+
queryId = UINT64CONST(2);
1161+
}
1162+
11531163
/* Set up key for hashtable search */
11541164
key.userid = GetUserId();
11551165
key.dbid = MyDatabaseId;
@@ -1293,16 +1303,32 @@ pgss_store(const char *query, uint64 queryId,
12931303
}
12941304

12951305
/*
1296-
* Reset all statement statistics.
1306+
* Reset statement statistics corresponding to userid, dbid, and queryid.
1307+
*/
1308+
Datum
1309+
pg_stat_statements_reset_1_7(PG_FUNCTION_ARGS)
1310+
{
1311+
Oid userid;
1312+
Oid dbid;
1313+
uint64 queryid;
1314+
1315+
userid = PG_GETARG_OID(0);
1316+
dbid = PG_GETARG_OID(1);
1317+
queryid = (uint64) PG_GETARG_INT64(2);
1318+
1319+
entry_reset(userid, dbid, queryid);
1320+
1321+
PG_RETURN_VOID();
1322+
}
1323+
1324+
/*
1325+
* Reset statement statistics.
12971326
*/
12981327
Datum
12991328
pg_stat_statements_reset(PG_FUNCTION_ARGS)
13001329
{
1301-
if (!pgss || !pgss_hash)
1302-
ereport(ERROR,
1303-
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
1304-
errmsg("pg_stat_statements must be loaded via shared_preload_libraries")));
1305-
entry_reset();
1330+
entry_reset(0, 0, 0);
1331+
13061332
PG_RETURN_VOID();
13071333
}
13081334

@@ -2229,23 +2255,68 @@ gc_qtexts(void)
22292255
}
22302256

22312257
/*
2232-
* Release all entries.
2258+
* Release entries corresponding to parameters passed.
22332259
*/
22342260
static void
2235-
entry_reset(void)
2261+
entry_reset(Oid userid, Oid dbid, uint64 queryid)
22362262
{
22372263
HASH_SEQ_STATUS hash_seq;
22382264
pgssEntry *entry;
22392265
FILE *qfile;
2266+
long num_entries;
2267+
long num_remove = 0;
2268+
pgssHashKey key;
2269+
2270+
if (!pgss || !pgss_hash)
2271+
ereport(ERROR,
2272+
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
2273+
errmsg("pg_stat_statements must be loaded via shared_preload_libraries")));
22402274

22412275
LWLockAcquire(pgss->lock, LW_EXCLUSIVE);
2276+
num_entries = hash_get_num_entries(pgss_hash);
22422277

2243-
hash_seq_init(&hash_seq, pgss_hash);
2244-
while ((entry = hash_seq_search(&hash_seq)) != NULL)
2278+
if (userid != 0 && dbid != 0 && queryid != UINT64CONST(0))
2279+
{
2280+
/* If all the parameters are available, use the fast path. */
2281+
key.userid = userid;
2282+
key.dbid = dbid;
2283+
key.queryid = queryid;
2284+
2285+
/* Remove the key if exists */
2286+
entry = (pgssEntry *) hash_search(pgss_hash, &key, HASH_REMOVE, NULL);
2287+
if (entry) /* found */
2288+
num_remove++;
2289+
}
2290+
else if (userid != 0 || dbid != 0 || queryid != UINT64CONST(0))
22452291
{
2246-
hash_search(pgss_hash, &entry->key, HASH_REMOVE, NULL);
2292+
/* Remove entries corresponding to valid parameters. */
2293+
hash_seq_init(&hash_seq, pgss_hash);
2294+
while ((entry = hash_seq_search(&hash_seq)) != NULL)
2295+
{
2296+
if ((!userid || entry->key.userid == userid) &&
2297+
(!dbid || entry->key.dbid == dbid) &&
2298+
(!queryid || entry->key.queryid == queryid))
2299+
{
2300+
hash_search(pgss_hash, &entry->key, HASH_REMOVE, NULL);
2301+
num_remove++;
2302+
}
2303+
}
2304+
}
2305+
else
2306+
{
2307+
/* Remove all entries. */
2308+
hash_seq_init(&hash_seq, pgss_hash);
2309+
while ((entry = hash_seq_search(&hash_seq)) != NULL)
2310+
{
2311+
hash_search(pgss_hash, &entry->key, HASH_REMOVE, NULL);
2312+
num_remove++;
2313+
}
22472314
}
22482315

2316+
/* All entries are removed? */
2317+
if (num_entries != num_remove)
2318+
goto release_lock;
2319+
22492320
/*
22502321
* Write new empty query file, perhaps even creating a new one to recover
22512322
* if the file was missing.
@@ -2274,6 +2345,7 @@ entry_reset(void)
22742345
/* This counts as a query text garbage collection for our purposes */
22752346
record_gc_qtexts();
22762347

2348+
release_lock:
22772349
LWLockRelease(pgss->lock);
22782350
}
22792351

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