rdelaage
/
postgresql
mirror of https://git.postgresql.org/git/postgresql.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Revert changes in HOT handling of BRIN indexes 

This reverts commits 5753d4ee32 and fe60b67250 that modified HOT to
ignore BRIN indexes. The commit message for 5753d4ee32 claims that:

    When determining whether an index update may be skipped by using
    HOT, we can ignore attributes indexed only by BRIN indexes. There
    are no index pointers to individual tuples in BRIN, and the page
    range summary will be updated anyway as it relies on visibility
    info.

This is partially incorrect - it's true BRIN indexes don't point to
individual tuples, so HOT chains are not an issue, but the visibitlity
info is not sufficient to keep the index up to date. This can easily
result in corrupted indexes, as demonstrated in the hackers thread.

This does not mean relaxing the HOT restrictions for BRIN is a lost
cause, but it needs to handle the two aspects (allowing HOT chains and
updating the page range summaries) as separate. But that requires a
major changes, and it's too late for that in the current dev cycle.

Reported-by: Tomas Vondra
Discussion: https://postgr.es/m/05ebcb44-f383-86e3-4f31-0a97a55634cf@enterprisedb.com
This commit is contained in:
Tomas Vondra 2022-06-16 15:02:48 +02:00
parent 664da2a389
commit e3fcca0d0d
17 changed files with 27 additions and 502 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
doc/src/sgml/indexam.sgml
View File

@ -126,8 +126,6 @@ typedef struct IndexAmRoutine
bool amcaninclude;
/* does AM use maintenance_work_mem? */
bool amusemaintenanceworkmem;
/* does AM block HOT update? */
bool amhotblocking;
/* OR of parallel vacuum flags */
uint8 amparallelvacuumoptions;
/* type of data stored in index, or InvalidOid if variable */
@ -248,15 +246,6 @@ typedef struct IndexAmRoutine
null, independently of <structfield>amoptionalkey</structfield>.
</para>
<para>
The <structfield>amhotblocking</structfield> flag indicates whether the
access method blocks <acronym>HOT</acronym> when an indexed attribute is
updated. Access methods without pointers to individual tuples (like
<acronym>BRIN</acronym>) may allow <acronym>HOT</acronym> even in this
case. This does not apply to attributes referenced in index predicates;
an update of such attribute always disables <acronym>HOT</acronym>.
</para>
</sect1>
<sect1 id="index-functions">

1
src/backend/access/brin/brin.c
View File

@ -108,7 +108,6 @@ brinhandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = false;
amroutine->amcaninclude = false;
amroutine->amusemaintenanceworkmem = false;
amroutine->amhotblocking = false;
amroutine->amparallelvacuumoptions =
VACUUM_OPTION_PARALLEL_CLEANUP;
amroutine->amkeytype = InvalidOid;

1
src/backend/access/gin/ginutil.c
View File

@ -56,7 +56,6 @@ ginhandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = false;
amroutine->amcaninclude = false;
amroutine->amusemaintenanceworkmem = true;
amroutine->amhotblocking = true;
amroutine->amparallelvacuumoptions =
VACUUM_OPTION_PARALLEL_BULKDEL | VACUUM_OPTION_PARALLEL_CLEANUP;
amroutine->amkeytype = InvalidOid;

1
src/backend/access/gist/gist.c
View File

@ -78,7 +78,6 @@ gisthandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = false;
amroutine->amcaninclude = true;
amroutine->amusemaintenanceworkmem = false;
amroutine->amhotblocking = true;
amroutine->amparallelvacuumoptions =
VACUUM_OPTION_PARALLEL_BULKDEL | VACUUM_OPTION_PARALLEL_COND_CLEANUP;
amroutine->amkeytype = InvalidOid;

1
src/backend/access/hash/hash.c
View File

@ -75,7 +75,6 @@ hashhandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = false;
amroutine->amcaninclude = false;
amroutine->amusemaintenanceworkmem = false;
amroutine->amhotblocking = true;
amroutine->amparallelvacuumoptions =
VACUUM_OPTION_PARALLEL_BULKDEL;
amroutine->amkeytype = INT4OID;

2
src/backend/access/heap/heapam.c
View File

@ -3190,7 +3190,7 @@ heap_update(Relation relation, ItemPointer otid, HeapTuple newtup,
* Note that we get copies of each bitmap, so we need not worry about
* relcache flush happening midway through.
*/
hot_attrs = RelationGetIndexAttrBitmap(relation, INDEX_ATTR_BITMAP_HOT_BLOCKING);
hot_attrs = RelationGetIndexAttrBitmap(relation, INDEX_ATTR_BITMAP_ALL);
key_attrs = RelationGetIndexAttrBitmap(relation, INDEX_ATTR_BITMAP_KEY);
id_attrs = RelationGetIndexAttrBitmap(relation,
INDEX_ATTR_BITMAP_IDENTITY_KEY);

1
src/backend/access/nbtree/nbtree.c
View File

@ -114,7 +114,6 @@ bthandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = true;
amroutine->amcaninclude = true;
amroutine->amusemaintenanceworkmem = false;
amroutine->amhotblocking = true;
amroutine->amparallelvacuumoptions =
VACUUM_OPTION_PARALLEL_BULKDEL | VACUUM_OPTION_PARALLEL_COND_CLEANUP;
amroutine->amkeytype = InvalidOid;

1
src/backend/access/spgist/spgutils.c
View File

@ -62,7 +62,6 @@ spghandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = false;
amroutine->amcaninclude = true;
amroutine->amusemaintenanceworkmem = false;
amroutine->amhotblocking = true;
amroutine->amparallelvacuumoptions =
VACUUM_OPTION_PARALLEL_BULKDEL | VACUUM_OPTION_PARALLEL_COND_CLEANUP;
amroutine->amkeytype = InvalidOid;

53
src/backend/utils/cache/relcache.c vendored
View File

@ -2439,10 +2439,10 @@ RelationDestroyRelation(Relation relation, bool remember_tupdesc)
list_free_deep(relation->rd_fkeylist);
list_free(relation->rd_indexlist);
list_free(relation->rd_statlist);
bms_free(relation->rd_indexattr);
bms_free(relation->rd_keyattr);
bms_free(relation->rd_pkattr);
bms_free(relation->rd_idattr);
bms_free(relation->rd_hotblockingattr);
if (relation->rd_pubdesc)
pfree(relation->rd_pubdesc);
if (relation->rd_options)
@ -5104,10 +5104,10 @@ RelationGetIndexPredicate(Relation relation)
Bitmapset *
RelationGetIndexAttrBitmap(Relation relation, IndexAttrBitmapKind attrKind)
{
Bitmapset *indexattrs; /* indexed columns */
Bitmapset *uindexattrs; /* columns in unique indexes */
Bitmapset *pkindexattrs; /* columns in the primary index */
Bitmapset *idindexattrs; /* columns in the replica identity */
Bitmapset *hotblockingattrs; /* columns with HOT blocking indexes */
List *indexoidlist;
List *newindexoidlist;
Oid relpkindex;
@ -5116,18 +5116,18 @@ RelationGetIndexAttrBitmap(Relation relation, IndexAttrBitmapKind attrKind)
MemoryContext oldcxt;
/* Quick exit if we already computed the result. */
if (relation->rd_attrsvalid)
if (relation->rd_indexattr != NULL)
{
switch (attrKind)
{
case INDEX_ATTR_BITMAP_ALL:
return bms_copy(relation->rd_indexattr);
case INDEX_ATTR_BITMAP_KEY:
return bms_copy(relation->rd_keyattr);
case INDEX_ATTR_BITMAP_PRIMARY_KEY:
return bms_copy(relation->rd_pkattr);
case INDEX_ATTR_BITMAP_IDENTITY_KEY:
return bms_copy(relation->rd_idattr);
case INDEX_ATTR_BITMAP_HOT_BLOCKING:
return bms_copy(relation->rd_hotblockingattr);
default:
elog(ERROR, "unknown attrKind %u", attrKind);
}
@ -5158,7 +5158,7 @@ restart:
relreplindex = relation->rd_replidindex;
/*
* For each index, add referenced attributes to appropriate bitmaps.
* For each index, add referenced attributes to indexattrs.
*
* Note: we consider all indexes returned by RelationGetIndexList, even if
* they are not indisready or indisvalid. This is important because an
@ -5167,10 +5167,10 @@ restart:
* CONCURRENTLY is far enough along that we should ignore the index, it
* won't be returned at all by RelationGetIndexList.
*/
indexattrs = NULL;
uindexattrs = NULL;
pkindexattrs = NULL;
idindexattrs = NULL;
hotblockingattrs = NULL;
foreach(l, indexoidlist)
{
Oid indexOid = lfirst_oid(l);
@ -5235,9 +5235,8 @@ restart:
*/
if (attrnum != 0)
{
if (indexDesc->rd_indam->amhotblocking)
hotblockingattrs = bms_add_member(hotblockingattrs,
attrnum - FirstLowInvalidHeapAttributeNumber);
indexattrs = bms_add_member(indexattrs,
attrnum - FirstLowInvalidHeapAttributeNumber);
if (isKey && i < indexDesc->rd_index->indnkeyatts)
uindexattrs = bms_add_member(uindexattrs,
@ -5254,15 +5253,10 @@ restart:
}
/* Collect all attributes used in expressions, too */
if (indexDesc->rd_indam->amhotblocking)
pull_varattnos(indexExpressions, 1, &hotblockingattrs);
pull_varattnos(indexExpressions, 1, &indexattrs);
/*
* Collect all attributes in the index predicate, too. We have to
* ignore amhotblocking flag, because the row might become indexable,
* in which case we have to add it to the index.
*/
pull_varattnos(indexPredicate, 1, &hotblockingattrs);
/* Collect all attributes in the index predicate, too */
pull_varattnos(indexPredicate, 1, &indexattrs);
index_close(indexDesc, AccessShareLock);
}
@ -5290,46 +5284,46 @@ restart:
bms_free(uindexattrs);
bms_free(pkindexattrs);
bms_free(idindexattrs);
bms_free(hotblockingattrs);
bms_free(indexattrs);
goto restart;
}
/* Don't leak the old values of these bitmaps, if any */
bms_free(relation->rd_indexattr);
relation->rd_indexattr = NULL;
bms_free(relation->rd_keyattr);
relation->rd_keyattr = NULL;
bms_free(relation->rd_pkattr);
relation->rd_pkattr = NULL;
bms_free(relation->rd_idattr);
relation->rd_idattr = NULL;
bms_free(relation->rd_hotblockingattr);
relation->rd_hotblockingattr = NULL;
/*
* Now save copies of the bitmaps in the relcache entry. We intentionally
* set rd_attrsvalid last, because that's what signals validity of the
* values; if we run out of memory before making that copy, we won't leave
* the relcache entry looking like the other ones are valid but empty.
* set rd_indexattr last, because that's the one that signals validity of
* the values; if we run out of memory before making that copy, we won't
* leave the relcache entry looking like the other ones are valid but
* empty.
*/
oldcxt = MemoryContextSwitchTo(CacheMemoryContext);
relation->rd_keyattr = bms_copy(uindexattrs);
relation->rd_pkattr = bms_copy(pkindexattrs);
relation->rd_idattr = bms_copy(idindexattrs);
relation->rd_hotblockingattr = bms_copy(hotblockingattrs);
relation->rd_attrsvalid = true;
relation->rd_indexattr = bms_copy(indexattrs);
MemoryContextSwitchTo(oldcxt);
/* We return our original working copy for caller to play with */
switch (attrKind)
{
case INDEX_ATTR_BITMAP_ALL:
return indexattrs;
case INDEX_ATTR_BITMAP_KEY:
return uindexattrs;
case INDEX_ATTR_BITMAP_PRIMARY_KEY:
return pkindexattrs;
case INDEX_ATTR_BITMAP_IDENTITY_KEY:
return idindexattrs;
case INDEX_ATTR_BITMAP_HOT_BLOCKING:
return hotblockingattrs;
default:
elog(ERROR, "unknown attrKind %u", attrKind);
return NULL;
@ -6250,11 +6244,10 @@ load_relcache_init_file(bool shared)
rel->rd_indexlist = NIL;
rel->rd_pkindex = InvalidOid;
rel->rd_replidindex = InvalidOid;
rel->rd_attrsvalid = false;
rel->rd_indexattr = NULL;
rel->rd_keyattr = NULL;
rel->rd_pkattr = NULL;
rel->rd_idattr = NULL;
rel->rd_hotblockingattr = NULL;
rel->rd_pubdesc = NULL;
rel->rd_statvalid = false;
rel->rd_statlist = NIL;

2
src/include/access/amapi.h
View File

@ -244,8 +244,6 @@ typedef struct IndexAmRoutine
bool amcaninclude;
/* does AM use maintenance_work_mem? */
bool amusemaintenanceworkmem;
/* does AM block HOT update? */
bool amhotblocking;
/* OR of parallel vacuum flags. See vacuum.h for flags. */
uint8 amparallelvacuumoptions;
/* type of data stored in index, or InvalidOid if variable */

3
src/include/utils/rel.h
View File

@ -155,11 +155,10 @@ typedef struct RelationData
List *rd_statlist; /* list of OIDs of extended stats */
/* data managed by RelationGetIndexAttrBitmap: */
bool rd_attrsvalid; /* are bitmaps of attrs valid? */
Bitmapset *rd_indexattr; /* identifies columns used in indexes */
Bitmapset *rd_keyattr; /* cols that can be ref'd by foreign keys */
Bitmapset *rd_pkattr; /* cols included in primary key */
Bitmapset *rd_idattr; /* included in replica identity index */
Bitmapset *rd_hotblockingattr; /* cols blocking HOT update */
PublicationDesc *rd_pubdesc; /* publication descriptor, or NULL */

4
src/include/utils/relcache.h
View File

@ -55,10 +55,10 @@ extern bytea **RelationGetIndexAttOptions(Relation relation, bool copy);
typedef enum IndexAttrBitmapKind
{
INDEX_ATTR_BITMAP_ALL,
INDEX_ATTR_BITMAP_KEY,
INDEX_ATTR_BITMAP_PRIMARY_KEY,
INDEX_ATTR_BITMAP_IDENTITY_KEY,
INDEX_ATTR_BITMAP_HOT_BLOCKING
INDEX_ATTR_BITMAP_IDENTITY_KEY
} IndexAttrBitmapKind;
extern Bitmapset *RelationGetIndexAttrBitmap(Relation relation,

1
src/test/modules/dummy_index_am/dummy_index_am.c
View File

@ -298,7 +298,6 @@ dihandler(PG_FUNCTION_ARGS)
amroutine->amcanparallel = false;
amroutine->amcaninclude = false;
amroutine->amusemaintenanceworkmem = false;
amroutine->amhotblocking = true;
amroutine->amparallelvacuumoptions = VACUUM_OPTION_NO_PARALLEL;
amroutine->amkeytype = InvalidOid;

58
src/test/regress/expected/brin.out
View File

@ -567,61 +567,3 @@ SELECT * FROM brintest_3 WHERE b < '0';
DROP TABLE brintest_3;
RESET enable_seqscan;
-- Test handling of index predicates - updating attributes in predicates
-- should block HOT even for BRIN. We update a row that was not indexed
-- due to the index predicate, and becomes indexable.
CREATE TABLE brin_hot_2 (a int, b int);
INSERT INTO brin_hot_2 VALUES (1, 100);
CREATE INDEX ON brin_hot_2 USING brin (b) WHERE a = 2;
UPDATE brin_hot_2 SET a = 2;
EXPLAIN (COSTS OFF) SELECT * FROM brin_hot_2 WHERE a = 2 AND b = 100;
QUERY PLAN
-----------------------------------
Seq Scan on brin_hot_2
Filter: ((a = 2) AND (b = 100))
(2 rows)
SELECT COUNT(*) FROM brin_hot_2 WHERE a = 2 AND b = 100;
count
-------
1
(1 row)
SET enable_seqscan = off;
EXPLAIN (COSTS OFF) SELECT * FROM brin_hot_2 WHERE a = 2 AND b = 100;
QUERY PLAN
---------------------------------------------
Bitmap Heap Scan on brin_hot_2
Recheck Cond: ((b = 100) AND (a = 2))
-> Bitmap Index Scan on brin_hot_2_b_idx
Index Cond: (b = 100)
(4 rows)
SELECT COUNT(*) FROM brin_hot_2 WHERE a = 2 AND b = 100;
count
-------
1
(1 row)
-- test BRIN index doesn't block HOT update
CREATE TABLE brin_hot (
id integer PRIMARY KEY,
val integer NOT NULL
) WITH (autovacuum_enabled = off, fillfactor = 70);
INSERT INTO brin_hot SELECT *, 0 FROM generate_series(1, 235);
CREATE INDEX val_brin ON brin_hot using brin(val);
UPDATE brin_hot SET val = -3 WHERE id = 42;
-- ensure pending stats are flushed
SELECT pg_stat_force_next_flush();
pg_stat_force_next_flush
--------------------------
(1 row)
SELECT pg_stat_get_tuples_hot_updated('brin_hot'::regclass::oid);
pg_stat_get_tuples_hot_updated
--------------------------------
1
(1 row)
DROP TABLE brin_hot;

242
src/test/regress/expected/stats.out
View File

@ -554,246 +554,4 @@ SELECT pg_stat_get_live_tuples(:drop_stats_test_subxact_oid);
DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4;
DROP TABLE prevstats;
-----
-- Test that various stats views are being properly populated
-----
-- Test that sessions is incremented when a new session is started in pg_stat_database
SELECT sessions AS db_stat_sessions FROM pg_stat_database WHERE datname = (SELECT current_database()) \gset
\c
SELECT sessions > :db_stat_sessions FROM pg_stat_database WHERE datname = (SELECT current_database());
?column?
----------
t
(1 row)
-- Test pg_stat_bgwriter checkpointer-related stats, together with pg_stat_wal
SELECT checkpoints_req AS rqst_ckpts_before FROM pg_stat_bgwriter \gset
-- Test pg_stat_wal
SELECT wal_bytes AS wal_bytes_before FROM pg_stat_wal \gset
CREATE TABLE test_stats_temp AS SELECT 17;
DROP TABLE test_stats_temp;
-- Checkpoint twice: The checkpointer reports stats after reporting completion
-- of the checkpoint. But after a second checkpoint we'll see at least the
-- results of the first.
CHECKPOINT;
CHECKPOINT;
SELECT checkpoints_req > :rqst_ckpts_before FROM pg_stat_bgwriter;
?column?
----------
t
(1 row)
SELECT wal_bytes > :wal_bytes_before FROM pg_stat_wal;
?column?
----------
t
(1 row)
-----
-- Test that resetting stats works for reset timestamp
-----
-- Test that reset_slru with a specified SLRU works.
SELECT stats_reset AS slru_commit_ts_reset_ts FROM pg_stat_slru WHERE name = 'CommitTs' \gset
SELECT stats_reset AS slru_notify_reset_ts FROM pg_stat_slru WHERE name = 'Notify' \gset
SELECT pg_stat_reset_slru('CommitTs');
pg_stat_reset_slru
--------------------
(1 row)
SELECT stats_reset > :'slru_commit_ts_reset_ts'::timestamptz FROM pg_stat_slru WHERE name = 'CommitTs';
?column?
----------
t
(1 row)
SELECT stats_reset AS slru_commit_ts_reset_ts FROM pg_stat_slru WHERE name = 'CommitTs' \gset
-- Test that multiple SLRUs are reset when no specific SLRU provided to reset function
SELECT pg_stat_reset_slru(NULL);
pg_stat_reset_slru
--------------------
(1 row)
SELECT stats_reset > :'slru_commit_ts_reset_ts'::timestamptz FROM pg_stat_slru WHERE name = 'CommitTs';
?column?
----------
t
(1 row)
SELECT stats_reset > :'slru_notify_reset_ts'::timestamptz FROM pg_stat_slru WHERE name = 'Notify';
?column?
----------
t
(1 row)
-- Test that reset_shared with archiver specified as the stats type works
SELECT stats_reset AS archiver_reset_ts FROM pg_stat_archiver \gset
SELECT pg_stat_reset_shared('archiver');
pg_stat_reset_shared
----------------------
(1 row)
SELECT stats_reset > :'archiver_reset_ts'::timestamptz FROM pg_stat_archiver;
?column?
----------
t
(1 row)
SELECT stats_reset AS archiver_reset_ts FROM pg_stat_archiver \gset
-- Test that reset_shared with bgwriter specified as the stats type works
SELECT stats_reset AS bgwriter_reset_ts FROM pg_stat_bgwriter \gset
SELECT pg_stat_reset_shared('bgwriter');
pg_stat_reset_shared
----------------------
(1 row)
SELECT stats_reset > :'bgwriter_reset_ts'::timestamptz FROM pg_stat_bgwriter;
?column?
----------
t
(1 row)
SELECT stats_reset AS bgwriter_reset_ts FROM pg_stat_bgwriter \gset
-- Test that reset_shared with wal specified as the stats type works
SELECT stats_reset AS wal_reset_ts FROM pg_stat_wal \gset
SELECT pg_stat_reset_shared('wal');
pg_stat_reset_shared
----------------------
(1 row)
SELECT stats_reset > :'wal_reset_ts'::timestamptz FROM pg_stat_wal;
?column?
----------
t
(1 row)
SELECT stats_reset AS wal_reset_ts FROM pg_stat_wal \gset
-- Test that reset_shared with no specified stats type doesn't reset anything
SELECT pg_stat_reset_shared(NULL);
pg_stat_reset_shared
----------------------
(1 row)
SELECT stats_reset = :'archiver_reset_ts'::timestamptz FROM pg_stat_archiver;
?column?
----------
t
(1 row)
SELECT stats_reset = :'bgwriter_reset_ts'::timestamptz FROM pg_stat_bgwriter;
?column?
----------
t
(1 row)
SELECT stats_reset = :'wal_reset_ts'::timestamptz FROM pg_stat_wal;
?column?
----------
t
(1 row)
-- Test that reset works for pg_stat_database
-- Since pg_stat_database stats_reset starts out as NULL, reset it once first so we have something to compare it to
SELECT pg_stat_reset();
pg_stat_reset
---------------
(1 row)
SELECT stats_reset AS db_reset_ts FROM pg_stat_database WHERE datname = (SELECT current_database()) \gset
SELECT pg_stat_reset();
pg_stat_reset
---------------
(1 row)
SELECT stats_reset > :'db_reset_ts'::timestamptz FROM pg_stat_database WHERE datname = (SELECT current_database());
?column?
----------
t
(1 row)
----
-- pg_stat_get_snapshot_timestamp behavior
----
BEGIN;
SET LOCAL stats_fetch_consistency = snapshot;
-- no snapshot yet, return NULL
SELECT pg_stat_get_snapshot_timestamp();
pg_stat_get_snapshot_timestamp
--------------------------------
(1 row)
-- any attempt at accessing stats will build snapshot
SELECT pg_stat_get_function_calls(0);
pg_stat_get_function_calls
----------------------------
(1 row)
SELECT pg_stat_get_snapshot_timestamp() >= NOW();
?column?
----------
t
(1 row)
-- shows NULL again after clearing
SELECT pg_stat_clear_snapshot();
pg_stat_clear_snapshot
------------------------
(1 row)
SELECT pg_stat_get_snapshot_timestamp();
pg_stat_get_snapshot_timestamp
--------------------------------
(1 row)
COMMIT;
----
-- pg_stat_have_stats behavior
----
-- fixed-numbered stats exist
SELECT pg_stat_have_stats('bgwriter', 0, 0);
pg_stat_have_stats
--------------------
t
(1 row)
-- unknown stats kinds error out
SELECT pg_stat_have_stats('zaphod', 0, 0);
ERROR: invalid statistics kind: "zaphod"
-- db stats have objoid 0
SELECT pg_stat_have_stats('database', (SELECT oid FROM pg_database WHERE datname = current_database()), 1);
pg_stat_have_stats
--------------------
f
(1 row)
SELECT pg_stat_have_stats('database', (SELECT oid FROM pg_database WHERE datname = current_database()), 0);
pg_stat_have_stats
--------------------
t
(1 row)
-- ensure that stats accessors handle NULL input correctly
SELECT pg_stat_get_replication_slot(NULL);
pg_stat_get_replication_slot
------------------------------
(1 row)
SELECT pg_stat_get_subscription_stats(NULL);
pg_stat_get_subscription_stats
--------------------------------
(1 row)
-- End of Stats Test

36
src/test/regress/sql/brin.sql
View File

@ -509,39 +509,3 @@ SELECT * FROM brintest_3 WHERE b < '0';
DROP TABLE brintest_3;
RESET enable_seqscan;
-- Test handling of index predicates - updating attributes in predicates
-- should block HOT even for BRIN. We update a row that was not indexed
-- due to the index predicate, and becomes indexable.
CREATE TABLE brin_hot_2 (a int, b int);
INSERT INTO brin_hot_2 VALUES (1, 100);
CREATE INDEX ON brin_hot_2 USING brin (b) WHERE a = 2;
UPDATE brin_hot_2 SET a = 2;
EXPLAIN (COSTS OFF) SELECT * FROM brin_hot_2 WHERE a = 2 AND b = 100;
SELECT COUNT(*) FROM brin_hot_2 WHERE a = 2 AND b = 100;
SET enable_seqscan = off;
EXPLAIN (COSTS OFF) SELECT * FROM brin_hot_2 WHERE a = 2 AND b = 100;
SELECT COUNT(*) FROM brin_hot_2 WHERE a = 2 AND b = 100;
-- test BRIN index doesn't block HOT update
CREATE TABLE brin_hot (
id integer PRIMARY KEY,
val integer NOT NULL
) WITH (autovacuum_enabled = off, fillfactor = 70);
INSERT INTO brin_hot SELECT *, 0 FROM generate_series(1, 235);
CREATE INDEX val_brin ON brin_hot using brin(val);
UPDATE brin_hot SET val = -3 WHERE id = 42;
-- ensure pending stats are flushed
SELECT pg_stat_force_next_flush();
SELECT pg_stat_get_tuples_hot_updated('brin_hot'::regclass::oid);
DROP TABLE brin_hot;

111
src/test/regress/sql/stats.sql
View File

@ -285,115 +285,4 @@ SELECT pg_stat_get_live_tuples(:drop_stats_test_subxact_oid);
DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4;
DROP TABLE prevstats;
-----
-- Test that various stats views are being properly populated
-----
-- Test that sessions is incremented when a new session is started in pg_stat_database
SELECT sessions AS db_stat_sessions FROM pg_stat_database WHERE datname = (SELECT current_database()) \gset
\c
SELECT sessions > :db_stat_sessions FROM pg_stat_database WHERE datname = (SELECT current_database());
-- Test pg_stat_bgwriter checkpointer-related stats, together with pg_stat_wal
SELECT checkpoints_req AS rqst_ckpts_before FROM pg_stat_bgwriter \gset
-- Test pg_stat_wal
SELECT wal_bytes AS wal_bytes_before FROM pg_stat_wal \gset
CREATE TABLE test_stats_temp AS SELECT 17;
DROP TABLE test_stats_temp;
-- Checkpoint twice: The checkpointer reports stats after reporting completion
-- of the checkpoint. But after a second checkpoint we'll see at least the
-- results of the first.
CHECKPOINT;
CHECKPOINT;
SELECT checkpoints_req > :rqst_ckpts_before FROM pg_stat_bgwriter;
SELECT wal_bytes > :wal_bytes_before FROM pg_stat_wal;
-----
-- Test that resetting stats works for reset timestamp
-----
-- Test that reset_slru with a specified SLRU works.
SELECT stats_reset AS slru_commit_ts_reset_ts FROM pg_stat_slru WHERE name = 'CommitTs' \gset
SELECT stats_reset AS slru_notify_reset_ts FROM pg_stat_slru WHERE name = 'Notify' \gset
SELECT pg_stat_reset_slru('CommitTs');
SELECT stats_reset > :'slru_commit_ts_reset_ts'::timestamptz FROM pg_stat_slru WHERE name = 'CommitTs';
SELECT stats_reset AS slru_commit_ts_reset_ts FROM pg_stat_slru WHERE name = 'CommitTs' \gset
-- Test that multiple SLRUs are reset when no specific SLRU provided to reset function
SELECT pg_stat_reset_slru(NULL);
SELECT stats_reset > :'slru_commit_ts_reset_ts'::timestamptz FROM pg_stat_slru WHERE name = 'CommitTs';
SELECT stats_reset > :'slru_notify_reset_ts'::timestamptz FROM pg_stat_slru WHERE name = 'Notify';
-- Test that reset_shared with archiver specified as the stats type works
SELECT stats_reset AS archiver_reset_ts FROM pg_stat_archiver \gset
SELECT pg_stat_reset_shared('archiver');
SELECT stats_reset > :'archiver_reset_ts'::timestamptz FROM pg_stat_archiver;
SELECT stats_reset AS archiver_reset_ts FROM pg_stat_archiver \gset
-- Test that reset_shared with bgwriter specified as the stats type works
SELECT stats_reset AS bgwriter_reset_ts FROM pg_stat_bgwriter \gset
SELECT pg_stat_reset_shared('bgwriter');
SELECT stats_reset > :'bgwriter_reset_ts'::timestamptz FROM pg_stat_bgwriter;
SELECT stats_reset AS bgwriter_reset_ts FROM pg_stat_bgwriter \gset
-- Test that reset_shared with wal specified as the stats type works
SELECT stats_reset AS wal_reset_ts FROM pg_stat_wal \gset
SELECT pg_stat_reset_shared('wal');
SELECT stats_reset > :'wal_reset_ts'::timestamptz FROM pg_stat_wal;
SELECT stats_reset AS wal_reset_ts FROM pg_stat_wal \gset
-- Test that reset_shared with no specified stats type doesn't reset anything
SELECT pg_stat_reset_shared(NULL);
SELECT stats_reset = :'archiver_reset_ts'::timestamptz FROM pg_stat_archiver;
SELECT stats_reset = :'bgwriter_reset_ts'::timestamptz FROM pg_stat_bgwriter;
SELECT stats_reset = :'wal_reset_ts'::timestamptz FROM pg_stat_wal;
-- Test that reset works for pg_stat_database
-- Since pg_stat_database stats_reset starts out as NULL, reset it once first so we have something to compare it to
SELECT pg_stat_reset();
SELECT stats_reset AS db_reset_ts FROM pg_stat_database WHERE datname = (SELECT current_database()) \gset
SELECT pg_stat_reset();
SELECT stats_reset > :'db_reset_ts'::timestamptz FROM pg_stat_database WHERE datname = (SELECT current_database());
----
-- pg_stat_get_snapshot_timestamp behavior
----
BEGIN;
SET LOCAL stats_fetch_consistency = snapshot;
-- no snapshot yet, return NULL
SELECT pg_stat_get_snapshot_timestamp();
-- any attempt at accessing stats will build snapshot
SELECT pg_stat_get_function_calls(0);
SELECT pg_stat_get_snapshot_timestamp() >= NOW();
-- shows NULL again after clearing
SELECT pg_stat_clear_snapshot();
SELECT pg_stat_get_snapshot_timestamp();
COMMIT;
----
-- pg_stat_have_stats behavior
----
-- fixed-numbered stats exist
SELECT pg_stat_have_stats('bgwriter', 0, 0);
-- unknown stats kinds error out
SELECT pg_stat_have_stats('zaphod', 0, 0);
-- db stats have objoid 0
SELECT pg_stat_have_stats('database', (SELECT oid FROM pg_database WHERE datname = current_database()), 1);
SELECT pg_stat_have_stats('database', (SELECT oid FROM pg_database WHERE datname = current_database()), 0);
-- ensure that stats accessors handle NULL input correctly
SELECT pg_stat_get_replication_slot(NULL);
SELECT pg_stat_get_subscription_stats(NULL);
-- End of Stats Test