bas = GetAccessStrategy(BAS_BULKREAD);
npages = RelationGetNumberOfBlocks(scan->indexRelation);
pgstat_count_index_scan(scan->indexRelation);
- scan->nsearches++;
for (blkno = BLOOM_HEAD_BLKNO; blkno < npages; blkno++)
{
Buffers: shared hit=21864
-> Bitmap Index Scan on bloomidx (cost=0.00..178436.00 rows=1 width=0) (actual time=20.005..20.005 rows=2300.00 loops=1)
Index Cond: ((i2 = 898732) AND (i5 = 123451))
- Index Searches: 1
Buffers: shared hit=19608
Planning Time: 0.099 ms
Execution Time: 22.632 ms
-(11 rows)
+(10 rows)
</programlisting>
</para>
Buffers: shared hit=6
-> Bitmap Index Scan on btreeidx5 (cost=0.00..4.52 rows=11 width=0) (actual time=0.026..0.026 rows=7.00 loops=1)
Index Cond: (i5 = 123451)
- Index Searches: 1
Buffers: shared hit=3
-> Bitmap Index Scan on btreeidx2 (cost=0.00..4.52 rows=11 width=0) (actual time=0.007..0.007 rows=8.00 loops=1)
Index Cond: (i2 = 898732)
- Index Searches: 1
Buffers: shared hit=3
Planning Time: 0.264 ms
Execution Time: 0.047 ms
-(15 rows)
+(13 rows)
</programlisting>
Although this query runs much faster than with either of the single
indexes, we pay a penalty in index size. Each of the single-column
<note>
<para>
- Index scans may sometimes perform multiple index searches per execution.
- Each index search increments <structname>pg_stat_all_indexes</structname>.<structfield>idx_scan</structfield>,
+ Queries that use certain <acronym>SQL</acronym> constructs to search for
+ rows matching any value out of a list or array of multiple scalar values
+ (see <xref linkend="functions-comparisons"/>) perform multiple
+ <quote>primitive</quote> index scans (up to one primitive scan per scalar
+ value) during query execution. Each internal primitive index scan
+ increments <structname>pg_stat_all_indexes</structname>.<structfield>idx_scan</structfield>,
so it's possible for the count of index scans to significantly exceed the
total number of index scan executor node executions.
</para>
- <para>
- This can happen with queries that use certain <acronym>SQL</acronym>
- constructs to search for rows matching any value out of a list or array of
- multiple scalar values (see <xref linkend="functions-comparisons"/>). It
- can also happen to queries with a
- <literal><replaceable>column_name</replaceable> =
- <replaceable>value1</replaceable> OR
- <replaceable>column_name</replaceable> =
- <replaceable>value2</replaceable> ...</literal> construct, though only
- when the optimizer transforms the construct into an equivalent
- multi-valued array representation.
- </para>
</note>
- <tip>
- <para>
- <command>EXPLAIN ANALYZE</command> outputs the total number of index
- searches performed by each index scan node. See
- <xref linkend="using-explain-analyze"/> for an example demonstrating how
- this works.
- </para>
- </tip>
</sect2>
Buffers: shared hit=3 read=5 written=4
-> Bitmap Index Scan on tenk1_unique1 (cost=0.00..4.36 rows=10 width=0) (actual time=0.004..0.004 rows=10.00 loops=1)
Index Cond: (unique1 < 10)
- Index Searches: 1
Buffers: shared hit=2
-> Index Scan using tenk2_unique2 on tenk2 t2 (cost=0.29..7.90 rows=1 width=244) (actual time=0.003..0.003 rows=1 loops=10)
Index Cond: (unique2 = t1.unique2)
- Index Searches: 10
Buffers: shared hit=24 read=6
Planning:
Buffers: shared hit=15 dirtied=9
Buffers: shared hit=92
-> Bitmap Index Scan on tenk1_unique1 (cost=0.00..5.04 rows=100 width=0) (actual time=0.013..0.013 rows=100.00 loops=1)
Index Cond: (unique1 < 100)
- Index Searches: 1
Buffers: shared hit=2
Planning:
Buffers: shared hit=12
shown.)
</para>
- <para>
- Index Scan nodes (as well as Bitmap Index Scan and Index-Only Scan nodes)
- show an <quote>Index Searches</quote> line that reports the total number
- of searches across <emphasis>all</emphasis> node
- executions/<literal>loops</literal>:
-
-<screen>
-EXPLAIN ANALYZE SELECT * FROM tenk1 WHERE thousand IN (1, 500, 700, 999);
- QUERY PLAN
--------------------------------------------------------------------&zwsp;---------------------------------------------------------
- Bitmap Heap Scan on tenk1 (cost=9.45..73.44 rows=40 width=244) (actual time=0.012..0.028 rows=40.00 loops=1)
- Recheck Cond: (thousand = ANY ('{1,500,700,999}'::integer[]))
- Heap Blocks: exact=39
- Buffers: shared hit=47
- -> Bitmap Index Scan on tenk1_thous_tenthous (cost=0.00..9.44 rows=40 width=0) (actual time=0.009..0.009 rows=40.00 loops=1)
- Index Cond: (thousand = ANY ('{1,500,700,999}'::integer[]))
- Index Searches: 4
- Buffers: shared hit=8
- Planning Time: 0.037 ms
- Execution Time: 0.034 ms
-</screen>
-
- Here we see a Bitmap Index Scan node that needed 4 separate index
- searches. The scan had to search the index from the
- <structname>tenk1_thous_tenthous</structname> index root page once per
- <type>integer</type> value from the predicate's <literal>IN</literal>
- construct. However, the number of index searches often won't have such a
- simple correspondence to the query predicate:
-
-<screen>
-EXPLAIN ANALYZE SELECT * FROM tenk1 WHERE thousand IN (1, 2, 3, 4);
- QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------------------
- Bitmap Heap Scan on tenk1 (cost=9.45..73.44 rows=40 width=244) (actual time=0.009..0.019 rows=40.00 loops=1)
- Recheck Cond: (thousand = ANY ('{1,2,3,4}'::integer[]))
- Heap Blocks: exact=38
- Buffers: shared hit=40
- -> Bitmap Index Scan on tenk1_thous_tenthous (cost=0.00..9.44 rows=40 width=0) (actual time=0.005..0.005 rows=40.00 loops=1)
- Index Cond: (thousand = ANY ('{1,2,3,4}'::integer[]))
- Index Searches: 1
- Buffers: shared hit=2
- Planning Time: 0.029 ms
- Execution Time: 0.026 ms
-</screen>
-
- This variant of our <literal>IN</literal> query performed only 1 index
- search. It spent less time traversing the index (compared to the original
- query) because its <literal>IN</literal> construct uses values matching
- index tuples stored next to each other, on the same
- <structname>tenk1_thous_tenthous</structname> index leaf page.
- </para>
-
<para>
Another type of extra information is the number of rows removed by a
filter condition:
Index Scan using gpolygonind on polygon_tbl (cost=0.13..8.15 rows=1 width=85) (actual time=0.074..0.074 rows=0.00 loops=1)
Index Cond: (f1 @> '((0.5,2))'::polygon)
Rows Removed by Index Recheck: 1
- Index Searches: 1
Buffers: shared hit=1
Planning Time: 0.039 ms
Execution Time: 0.098 ms
-> BitmapAnd (cost=25.07..25.07 rows=10 width=0) (actual time=0.100..0.101 rows=0.00 loops=1)
-> Bitmap Index Scan on tenk1_unique1 (cost=0.00..5.04 rows=100 width=0) (actual time=0.027..0.027 rows=100.00 loops=1)
Index Cond: (unique1 < 100)
- Index Searches: 1
-> Bitmap Index Scan on tenk1_unique2 (cost=0.00..19.78 rows=999 width=0) (actual time=0.070..0.070 rows=999.00 loops=1)
Index Cond: (unique2 > 9000)
- Index Searches: 1
Planning Time: 0.162 ms
Execution Time: 0.143 ms
</screen>
Buffers: shared hit=4 read=2
-> Bitmap Index Scan on tenk1_unique1 (cost=0.00..5.04 rows=100 width=0) (actual time=0.031..0.031 rows=100.00 loops=1)
Index Cond: (unique1 < 100)
- Index Searches: 1
Buffers: shared read=2
Planning Time: 0.151 ms
Execution Time: 1.856 ms
Index Cond: (unique2 > 9000)
Filter: (unique1 < 100)
Rows Removed by Filter: 287
- Index Searches: 1
Buffers: shared hit=16
Planning Time: 0.077 ms
Execution Time: 0.086 ms
Buffers: shared hit=4
-> Index Scan using test_pkey on test (cost=0.29..10.27 rows=99 width=8) (actual time=0.009..0.025 rows=99.00 loops=1)
Index Cond: ((id > 100) AND (id < 200))
- Index Searches: 1
Buffers: shared hit=4
Planning Time: 0.244 ms
Execution Time: 0.073 ms
-(10 rows)
+(9 rows)
</programlisting>
</para>
-> Index Only Scan using wrd_word on wrd (cost=0.42..4.44 rows=1 width=0) (actual time=0.039..0.039 rows=0.00 loops=1)
Index Cond: (word = 'caterpiler'::text)
Heap Fetches: 0
- Index Searches: 1
Planning time: 0.164 ms
Execution time: 0.117 ms
</programlisting>
Limit (cost=0.29..1.06 rows=10 width=10) (actual time=187.222..188.257 rows=10.00 loops=1)
-> Index Scan using wrd_trgm on wrd (cost=0.29..37020.87 rows=479829 width=10) (actual time=187.219..188.252 rows=10.00 loops=1)
Order By: (word <-> 'caterpiler'::text)
- Index Searches: 1
Planning time: 0.196 ms
Execution time: 198.640 ms
</programlisting>
opaque = (BrinOpaque *) scan->opaque;
bdesc = opaque->bo_bdesc;
pgstat_count_index_scan(idxRel);
- scan->nsearches++;
/*
* We need to know the size of the table so that we know how long to
MemoryContextSwitchTo(oldCtx);
pgstat_count_index_scan(scan->indexRelation);
- scan->nsearches++;
}
void
GISTSearchItem fakeItem;
pgstat_count_index_scan(scan->indexRelation);
- scan->nsearches++;
so->firstCall = false;
so->curPageData = so->nPageData = 0;
return 0;
pgstat_count_index_scan(scan->indexRelation);
- scan->nsearches++;
/* Begin the scan by processing the root page */
so->curPageData = so->nPageData = 0;
HashScanPosItem *currItem;
pgstat_count_index_scan(rel);
- scan->nsearches++;
/*
* We do not support hash scans with no index qualification, because we
scan->ignore_killed_tuples = !scan->xactStartedInRecovery;
scan->opaque = NULL;
- scan->nsearches = 0;
scan->xs_itup = NULL;
scan->xs_itupdesc = NULL;
BTPS_State btps_pageStatus; /* indicates whether next page is
* available for scan. see above for
* possible states of parallel scan. */
- uint64 btps_nsearches; /* tracked for IndexScanDescData.nsearches */
slock_t btps_mutex; /* protects above variables, btps_arrElems */
ConditionVariable btps_cv; /* used to synchronize parallel scan */
bt_target->btps_nextScanPage = InvalidBlockNumber;
bt_target->btps_lastCurrPage = InvalidBlockNumber;
bt_target->btps_pageStatus = BTPARALLEL_NOT_INITIALIZED;
- bt_target->btps_nsearches = 0;
ConditionVariableInit(&bt_target->btps_cv);
}
btscan->btps_nextScanPage = InvalidBlockNumber;
btscan->btps_lastCurrPage = InvalidBlockNumber;
btscan->btps_pageStatus = BTPARALLEL_NOT_INITIALIZED;
- /* deliberately don't reset btps_nsearches (matches index_rescan) */
SpinLockRelease(&btscan->btps_mutex);
}
{
/* Can start scheduled primitive scan right away, so do so */
btscan->btps_pageStatus = BTPARALLEL_ADVANCING;
- btscan->btps_nsearches++;
for (int i = 0; i < so->numArrayKeys; i++)
{
BTArrayKeyInfo *array = &so->arrayKeys[i];
*/
btscan->btps_pageStatus = BTPARALLEL_ADVANCING;
Assert(btscan->btps_nextScanPage != P_NONE);
- if (btscan->btps_nextScanPage == InvalidBlockNumber)
- {
- Assert(first);
- btscan->btps_nsearches++;
- }
*next_scan_page = btscan->btps_nextScanPage;
*last_curr_page = btscan->btps_lastCurrPage;
exit_loop = true;
btscan->btps_pageStatus = BTPARALLEL_DONE;
status_changed = true;
}
-
- /*
- * Don't use local nsearches counter -- overwrite it with the nsearches
- * counter that we've been maintaining in shared memory
- */
- scan->nsearches = btscan->btps_nsearches;
SpinLockRelease(&btscan->btps_mutex);
/* wake up all the workers associated with this parallel scan */
* _bt_search/_bt_endpoint below
*/
pgstat_count_index_scan(rel);
- scan->nsearches++;
/*----------
* Examine the scan keys to discover where we need to start the scan.
/* count an indexscan for stats */
pgstat_count_index_scan(scan->indexRelation);
- scan->nsearches++;
}
void
*/
#include "postgres.h"
-#include "access/relscan.h"
#include "access/xact.h"
#include "catalog/pg_type.h"
#include "commands/createas.h"
static void show_memoize_info(MemoizeState *mstate, List *ancestors,
ExplainState *es);
static void show_hashagg_info(AggState *aggstate, ExplainState *es);
-static void show_indexsearches_info(PlanState *planstate, ExplainState *es);
static void show_tidbitmap_info(BitmapHeapScanState *planstate,
ExplainState *es);
static void show_instrumentation_count(const char *qlabel, int which,
if (plan->qual)
show_instrumentation_count("Rows Removed by Filter", 1,
planstate, es);
- show_indexsearches_info(planstate, es);
break;
case T_IndexOnlyScan:
show_scan_qual(((IndexOnlyScan *) plan)->indexqual,
if (es->analyze)
ExplainPropertyFloat("Heap Fetches", NULL,
planstate->instrument->ntuples2, 0, es);
- show_indexsearches_info(planstate, es);
break;
case T_BitmapIndexScan:
show_scan_qual(((BitmapIndexScan *) plan)->indexqualorig,
"Index Cond", planstate, ancestors, es);
- show_indexsearches_info(planstate, es);
break;
case T_BitmapHeapScan:
show_scan_qual(((BitmapHeapScan *) plan)->bitmapqualorig,
}
}
-/*
- * Show the total number of index searches performed by a
- * IndexScan/IndexOnlyScan/BitmapIndexScan node
- */
-static void
-show_indexsearches_info(PlanState *planstate, ExplainState *es)
-{
- Plan *plan = planstate->plan;
- struct IndexScanDescData *scanDesc = NULL;
- uint64 nsearches = 0;
-
- if (!es->analyze)
- return;
-
- switch (nodeTag(plan))
- {
- case T_IndexScan:
- scanDesc = ((IndexScanState *) planstate)->iss_ScanDesc;
- break;
- case T_IndexOnlyScan:
- scanDesc = ((IndexOnlyScanState *) planstate)->ioss_ScanDesc;
- break;
- case T_BitmapIndexScan:
- scanDesc = ((BitmapIndexScanState *) planstate)->biss_ScanDesc;
- break;
- default:
- break;
- }
-
- if (scanDesc)
- nsearches = scanDesc->nsearches;
-
- ExplainPropertyUInteger("Index Searches", NULL, nsearches, es);
-}
-
/*
* Show exact/lossy pages for a BitmapHeapScan node
*/
/* index access method's private state */
void *opaque; /* access-method-specific info */
- /*
- * Instrumentation counters that are maintained by every index access
- * method, for all scan types. These go here because there is no standard
- * way to access PlanState.instrument during amgettuple calls.
- */
- uint64 nsearches; /* total # of index searches */
-
/*
* In an index-only scan, a successful amgettuple call must fill either
* xs_itup (and xs_itupdesc) or xs_hitup (and xs_hitupdesc) to provide the
Recheck Cond: (a = '2023-01-01'::date)
-> Bitmap Index Scan on brin_date_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '2023-01-01'::date)
- Index Searches: 1
-(5 rows)
+(4 rows)
DROP TABLE brin_date_test;
RESET enable_seqscan;
Recheck Cond: (a = '2023-01-01 00:00:00'::timestamp without time zone)
-> Bitmap Index Scan on brin_timestamp_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '2023-01-01 00:00:00'::timestamp without time zone)
- Index Searches: 1
-(5 rows)
+(4 rows)
EXPLAIN (ANALYZE, TIMING OFF, COSTS OFF, SUMMARY OFF, BUFFERS OFF)
SELECT * FROM brin_timestamp_test WHERE a = '1900-01-01'::timestamp;
Recheck Cond: (a = '1900-01-01 00:00:00'::timestamp without time zone)
-> Bitmap Index Scan on brin_timestamp_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '1900-01-01 00:00:00'::timestamp without time zone)
- Index Searches: 1
-(5 rows)
+(4 rows)
DROP TABLE brin_timestamp_test;
RESET enable_seqscan;
Recheck Cond: (a = '2023-01-01'::date)
-> Bitmap Index Scan on brin_date_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '2023-01-01'::date)
- Index Searches: 1
-(5 rows)
+(4 rows)
EXPLAIN (ANALYZE, TIMING OFF, COSTS OFF, SUMMARY OFF, BUFFERS OFF)
SELECT * FROM brin_date_test WHERE a = '1900-01-01'::date;
Recheck Cond: (a = '1900-01-01'::date)
-> Bitmap Index Scan on brin_date_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '1900-01-01'::date)
- Index Searches: 1
-(5 rows)
+(4 rows)
DROP TABLE brin_date_test;
RESET enable_seqscan;
Recheck Cond: (a = '@ 30 years ago'::interval)
-> Bitmap Index Scan on brin_interval_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '@ 30 years ago'::interval)
- Index Searches: 1
-(5 rows)
+(4 rows)
EXPLAIN (ANALYZE, TIMING OFF, COSTS OFF, SUMMARY OFF, BUFFERS OFF)
SELECT * FROM brin_interval_test WHERE a = '30 years'::interval;
Recheck Cond: (a = '@ 30 years'::interval)
-> Bitmap Index Scan on brin_interval_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '@ 30 years'::interval)
- Index Searches: 1
-(5 rows)
+(4 rows)
DROP TABLE brin_interval_test;
RESET enable_seqscan;
Recheck Cond: (a = '@ 30 years ago'::interval)
-> Bitmap Index Scan on brin_interval_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '@ 30 years ago'::interval)
- Index Searches: 1
-(5 rows)
+(4 rows)
EXPLAIN (ANALYZE, TIMING OFF, COSTS OFF, SUMMARY OFF, BUFFERS OFF)
SELECT * FROM brin_interval_test WHERE a = '30 years'::interval;
Recheck Cond: (a = '@ 30 years'::interval)
-> Bitmap Index Scan on brin_interval_test_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = '@ 30 years'::interval)
- Index Searches: 1
-(5 rows)
+(4 rows)
DROP TABLE brin_interval_test;
RESET enable_seqscan;
ln := regexp_replace(ln, 'Evictions: 0', 'Evictions: Zero');
ln := regexp_replace(ln, 'Evictions: \d+', 'Evictions: N');
ln := regexp_replace(ln, 'Memory Usage: \d+', 'Memory Usage: N');
- ln := regexp_replace(ln, 'Heap Fetches: \d+', 'Heap Fetches: N');
- ln := regexp_replace(ln, 'loops=\d+', 'loops=N');
- ln := regexp_replace(ln, 'Index Searches: \d+', 'Index Searches: N');
+ ln := regexp_replace(ln, 'Heap Fetches: \d+', 'Heap Fetches: N');
+ ln := regexp_replace(ln, 'loops=\d+', 'loops=N');
return next ln;
end loop;
end;
-> Index Only Scan using tenk1_unique1 on tenk1 t1 (actual rows=1.00 loops=N)
Index Cond: (unique1 = t2.twenty)
Heap Fetches: N
- Index Searches: N
-(13 rows)
+(12 rows)
-- And check we get the expected results.
SELECT COUNT(*),AVG(t1.unique1) FROM tenk1 t1
-> Index Only Scan using tenk1_unique1 on tenk1 t2 (actual rows=1.00 loops=N)
Index Cond: (unique1 = t1.twenty)
Heap Fetches: N
- Index Searches: N
-(13 rows)
+(12 rows)
-- And check we get the expected results.
SELECT COUNT(*),AVG(t2.unique1) FROM tenk1 t1,
-> Nested Loop Left Join (actual rows=20.00 loops=N)
-> Index Scan using tenk1_unique1 on tenk1 t1 (actual rows=10.00 loops=N)
Index Cond: (unique1 < 10)
- Index Searches: N
-> Memoize (actual rows=2.00 loops=N)
Cache Key: t1.two
Cache Mode: binary
Rows Removed by Filter: 2
-> Index Scan using tenk1_unique1 on tenk1 t2_1 (actual rows=4.00 loops=N)
Index Cond: (unique1 < 4)
- Index Searches: N
-(15 rows)
+(13 rows)
-- And check we get the expected results.
SELECT COUNT(*),AVG(t2.t1two) FROM tenk1 t1 LEFT JOIN
Filter: ((t1.two + 1) = unique1)
Rows Removed by Filter: 9999
Heap Fetches: N
- Index Searches: N
-(14 rows)
+(13 rows)
-- And check we get the expected results.
SELECT COUNT(*), AVG(t1.twenty) FROM tenk1 t1 LEFT JOIN
Index Cond: (x = (t1.t)::numeric)
Filter: (t1.x = (t)::numeric)
Heap Fetches: N
- Index Searches: N
-(11 rows)
+(10 rows)
DROP TABLE expr_key;
-- Reduce work_mem and hash_mem_multiplier so that we see some cache evictions
-> Index Only Scan using tenk1_unique1 on tenk1 t1 (actual rows=1.00 loops=N)
Index Cond: (unique1 = t2.thousand)
Heap Fetches: N
- Index Searches: N
-(13 rows)
+(12 rows)
CREATE TABLE flt (f float);
CREATE INDEX flt_f_idx ON flt (f);
Nested Loop (actual rows=4.00 loops=N)
-> Index Only Scan using flt_f_idx on flt f1 (actual rows=2.00 loops=N)
Heap Fetches: N
- Index Searches: N
-> Memoize (actual rows=2.00 loops=N)
Cache Key: f1.f
Cache Mode: logical
-> Index Only Scan using flt_f_idx on flt f2 (actual rows=2.00 loops=N)
Index Cond: (f = f1.f)
Heap Fetches: N
- Index Searches: N
-(12 rows)
+(10 rows)
-- Ensure memoize operates in binary mode
SELECT explain_memoize('
Nested Loop (actual rows=4.00 loops=N)
-> Index Only Scan using flt_f_idx on flt f1 (actual rows=2.00 loops=N)
Heap Fetches: N
- Index Searches: N
-> Memoize (actual rows=2.00 loops=N)
Cache Key: f1.f
Cache Mode: binary
-> Index Only Scan using flt_f_idx on flt f2 (actual rows=2.00 loops=N)
Index Cond: (f <= f1.f)
Heap Fetches: N
- Index Searches: N
-(12 rows)
+(10 rows)
DROP TABLE flt;
-- Exercise Memoize in binary mode with a large fixed width type and a
Hits: 3 Misses: 3 Evictions: Zero Overflows: 0 Memory Usage: NkB
-> Index Scan using strtest_n_idx on strtest s2 (actual rows=4.00 loops=N)
Index Cond: (n <= s1.n)
- Index Searches: N
-(10 rows)
+(9 rows)
-- Ensure we get 3 hits and 3 misses
SELECT explain_memoize('
Hits: 3 Misses: 3 Evictions: Zero Overflows: 0 Memory Usage: NkB
-> Index Scan using strtest_t_idx on strtest s2 (actual rows=4.00 loops=N)
Index Cond: (t <= s1.t)
- Index Searches: N
-(10 rows)
+(9 rows)
DROP TABLE strtest;
-- Ensure memoize works with partitionwise join
-> Nested Loop (actual rows=16.00 loops=N)
-> Index Only Scan using iprt_p1_a on prt_p1 t1_1 (actual rows=4.00 loops=N)
Heap Fetches: N
- Index Searches: N
-> Memoize (actual rows=4.00 loops=N)
Cache Key: t1_1.a
Cache Mode: logical
-> Index Only Scan using iprt_p1_a on prt_p1 t2_1 (actual rows=4.00 loops=N)
Index Cond: (a = t1_1.a)
Heap Fetches: N
- Index Searches: N
-> Nested Loop (actual rows=16.00 loops=N)
-> Index Only Scan using iprt_p2_a on prt_p2 t1_2 (actual rows=4.00 loops=N)
Heap Fetches: N
- Index Searches: N
-> Memoize (actual rows=4.00 loops=N)
Cache Key: t1_2.a
Cache Mode: logical
-> Index Only Scan using iprt_p2_a on prt_p2 t2_2 (actual rows=4.00 loops=N)
Index Cond: (a = t1_2.a)
Heap Fetches: N
- Index Searches: N
-(25 rows)
+(21 rows)
-- Ensure memoize works with parameterized union-all Append path
SET enable_partitionwise_join TO off;
Nested Loop (actual rows=16.00 loops=N)
-> Index Only Scan using iprt_p1_a on prt_p1 t1 (actual rows=4.00 loops=N)
Heap Fetches: N
- Index Searches: N
-> Memoize (actual rows=4.00 loops=N)
Cache Key: t1.a
Cache Mode: logical
-> Index Only Scan using iprt_p1_a on prt_p1 (actual rows=4.00 loops=N)
Index Cond: (a = t1.a)
Heap Fetches: N
- Index Searches: N
-> Index Only Scan using iprt_p2_a on prt_p2 (actual rows=0.00 loops=N)
Index Cond: (a = t1.a)
Heap Fetches: N
- Index Searches: N
-(17 rows)
+(14 rows)
DROP TABLE prt;
RESET enable_partitionwise_join;
ln := regexp_replace(ln, 'Workers Launched: \d+', 'Workers Launched: N');
ln := regexp_replace(ln, 'actual rows=\d+(?:\.\d+)? loops=\d+', 'actual rows=N loops=N');
ln := regexp_replace(ln, 'Rows Removed by Filter: \d+', 'Rows Removed by Filter: N');
- perform regexp_matches(ln, 'Index Searches: \d+');
- if found then
- continue;
- end if;
return next ln;
end loop;
end;
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a1_b1_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a1_b2 ab_2 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a1_b2_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a1_b3 ab_3 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a1_b3_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a2_b1 ab_4 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a2_b1_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a2_b2 ab_5 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a2_b2_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a2_b3 ab_6 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a2_b3_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a3_b1 ab_7 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a3_b1_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a3_b2 ab_8 (actual rows=0.00 loops=1)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a3_b2_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a3_b3 ab_9 (never executed)
Recheck Cond: (a = (InitPlan 1).col1)
Filter: (b = (InitPlan 2).col1)
-> Bitmap Index Scan on ab_a3_b3_a_idx (never executed)
Index Cond: (a = (InitPlan 1).col1)
- Index Searches: 0
-(61 rows)
+(52 rows)
-- Test run-time partition pruning with UNION ALL parents
explain (analyze, costs off, summary off, timing off, buffers off)
Filter: (b = (InitPlan 1).col1)
-> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a1_b2 ab_12 (never executed)
Recheck Cond: (a = 1)
Filter: (b = (InitPlan 1).col1)
-> Bitmap Index Scan on ab_a1_b2_a_idx (never executed)
Index Cond: (a = 1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a1_b3 ab_13 (never executed)
Recheck Cond: (a = 1)
Filter: (b = (InitPlan 1).col1)
-> Bitmap Index Scan on ab_a1_b3_a_idx (never executed)
Index Cond: (a = 1)
- Index Searches: 0
-> Seq Scan on ab_a1_b1 ab_1 (actual rows=0.00 loops=1)
Filter: (b = (InitPlan 1).col1)
-> Seq Scan on ab_a1_b2 ab_2 (never executed)
Filter: (b = (InitPlan 1).col1)
-> Seq Scan on ab_a3_b3 ab_9 (never executed)
Filter: (b = (InitPlan 1).col1)
-(40 rows)
+(37 rows)
-- A case containing a UNION ALL with a non-partitioned child.
explain (analyze, costs off, summary off, timing off, buffers off)
Filter: (b = (InitPlan 1).col1)
-> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a1_b2 ab_12 (never executed)
Recheck Cond: (a = 1)
Filter: (b = (InitPlan 1).col1)
-> Bitmap Index Scan on ab_a1_b2_a_idx (never executed)
Index Cond: (a = 1)
- Index Searches: 0
-> Bitmap Heap Scan on ab_a1_b3 ab_13 (never executed)
Recheck Cond: (a = 1)
Filter: (b = (InitPlan 1).col1)
-> Bitmap Index Scan on ab_a1_b3_a_idx (never executed)
Index Cond: (a = 1)
- Index Searches: 0
-> Result (actual rows=0.00 loops=1)
One-Time Filter: (5 = (InitPlan 1).col1)
-> Seq Scan on ab_a1_b1 ab_1 (actual rows=0.00 loops=1)
Filter: (b = (InitPlan 1).col1)
-> Seq Scan on ab_a3_b3 ab_9 (never executed)
Filter: (b = (InitPlan 1).col1)
-(42 rows)
+(39 rows)
-- Another UNION ALL test, but containing a mix of exec init and exec run-time pruning.
create table xy_1 (x int, y int);
Recheck Cond: (a = 1)
-> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a1_b2 ab_a1_2 (actual rows=1.00 loops=1)
Recheck Cond: (a = 1)
Heap Blocks: exact=1
-> Bitmap Index Scan on ab_a1_b2_a_idx (actual rows=1.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a1_b3 ab_a1_3 (actual rows=0.00 loops=1)
Recheck Cond: (a = 1)
Heap Blocks: exact=1
-> Bitmap Index Scan on ab_a1_b3_a_idx (actual rows=1.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Materialize (actual rows=1.00 loops=1)
Storage: Memory Maximum Storage: NkB
-> Append (actual rows=1.00 loops=1)
Recheck Cond: (a = 1)
-> Bitmap Index Scan on ab_a1_b1_a_idx (actual rows=0.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a1_b2 ab_2 (actual rows=1.00 loops=1)
Recheck Cond: (a = 1)
Heap Blocks: exact=1
-> Bitmap Index Scan on ab_a1_b2_a_idx (actual rows=1.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-> Bitmap Heap Scan on ab_a1_b3 ab_3 (actual rows=0.00 loops=1)
Recheck Cond: (a = 1)
Heap Blocks: exact=1
-> Bitmap Index Scan on ab_a1_b3_a_idx (actual rows=1.00 loops=1)
Index Cond: (a = 1)
- Index Searches: 1
-(43 rows)
+(37 rows)
table ab;
a | b
-> Append (actual rows=3.00 loops=2)
-> Index Scan using tprt1_idx on tprt_1 (actual rows=2.00 loops=2)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 2
-> Index Scan using tprt2_idx on tprt_2 (actual rows=2.00 loops=1)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 1
-> Index Scan using tprt3_idx on tprt_3 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt4_idx on tprt_4 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt5_idx on tprt_5 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt6_idx on tprt_6 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-(21 rows)
+(15 rows)
explain (analyze, costs off, summary off, timing off, buffers off)
select * from tbl1 join tprt on tbl1.col1 = tprt.col1;
-> Append (actual rows=1.00 loops=2)
-> Index Scan using tprt1_idx on tprt_1 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt2_idx on tprt_2 (actual rows=1.00 loops=2)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 2
-> Index Scan using tprt3_idx on tprt_3 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt4_idx on tprt_4 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt5_idx on tprt_5 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt6_idx on tprt_6 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-(21 rows)
+(15 rows)
select tbl1.col1, tprt.col1 from tbl1
inner join tprt on tbl1.col1 > tprt.col1
-> Append (actual rows=4.60 loops=5)
-> Index Scan using tprt1_idx on tprt_1 (actual rows=2.00 loops=5)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 5
-> Index Scan using tprt2_idx on tprt_2 (actual rows=2.75 loops=4)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 4
-> Index Scan using tprt3_idx on tprt_3 (actual rows=1.00 loops=2)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 2
-> Index Scan using tprt4_idx on tprt_4 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt5_idx on tprt_5 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt6_idx on tprt_6 (never executed)
Index Cond: (col1 < tbl1.col1)
- Index Searches: 0
-(21 rows)
+(15 rows)
explain (analyze, costs off, summary off, timing off, buffers off)
select * from tbl1 inner join tprt on tbl1.col1 = tprt.col1;
-> Append (actual rows=0.60 loops=5)
-> Index Scan using tprt1_idx on tprt_1 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt2_idx on tprt_2 (actual rows=1.00 loops=2)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 2
-> Index Scan using tprt3_idx on tprt_3 (actual rows=0.33 loops=3)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 3
-> Index Scan using tprt4_idx on tprt_4 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt5_idx on tprt_5 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt6_idx on tprt_6 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-(21 rows)
+(15 rows)
select tbl1.col1, tprt.col1 from tbl1
inner join tprt on tbl1.col1 > tprt.col1
-> Append (actual rows=1.00 loops=1)
-> Index Scan using tprt1_idx on tprt_1 (never executed)
Index Cond: (col1 > tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt2_idx on tprt_2 (never executed)
Index Cond: (col1 > tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt3_idx on tprt_3 (never executed)
Index Cond: (col1 > tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt4_idx on tprt_4 (never executed)
Index Cond: (col1 > tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt5_idx on tprt_5 (never executed)
Index Cond: (col1 > tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt6_idx on tprt_6 (actual rows=1.00 loops=1)
Index Cond: (col1 > tbl1.col1)
- Index Searches: 1
-(21 rows)
+(15 rows)
select tbl1.col1, tprt.col1 from tbl1
inner join tprt on tbl1.col1 < tprt.col1
-> Append (actual rows=0.00 loops=1)
-> Index Scan using tprt1_idx on tprt_1 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt2_idx on tprt_2 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt3_idx on tprt_3 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt4_idx on tprt_4 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt5_idx on tprt_5 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-> Index Scan using tprt6_idx on tprt_6 (never executed)
Index Cond: (col1 = tbl1.col1)
- Index Searches: 0
-(21 rows)
+(15 rows)
select tbl1.col1, tprt.col1 from tbl1
inner join tprt on tbl1.col1 = tprt.col1
-> Index Scan using ma_test_p2_b_idx on ma_test_p2 ma_test_1 (actual rows=1.00 loops=1)
Filter: ((a >= $1) AND ((a % 10) = 5))
Rows Removed by Filter: 9
- Index Searches: 1
-> Index Scan using ma_test_p3_b_idx on ma_test_p3 ma_test_2 (actual rows=1.00 loops=1)
Filter: ((a >= $1) AND ((a % 10) = 5))
Rows Removed by Filter: 9
- Index Searches: 1
-(11 rows)
+(9 rows)
execute mt_q1(15);
a
-> Index Scan using ma_test_p3_b_idx on ma_test_p3 ma_test_1 (actual rows=1.00 loops=1)
Filter: ((a >= $1) AND ((a % 10) = 5))
Rows Removed by Filter: 9
- Index Searches: 1
-(7 rows)
+(6 rows)
execute mt_q1(25);
a
-> Limit (actual rows=1.00 loops=1)
-> Index Scan using ma_test_p2_b_idx on ma_test_p2 (actual rows=1.00 loops=1)
Index Cond: (b IS NOT NULL)
- Index Searches: 1
-> Index Scan using ma_test_p1_b_idx on ma_test_p1 ma_test_1 (never executed)
Filter: (a >= (InitPlan 2).col1)
- Index Searches: 0
-> Index Scan using ma_test_p2_b_idx on ma_test_p2 ma_test_2 (actual rows=10.00 loops=1)
Filter: (a >= (InitPlan 2).col1)
- Index Searches: 1
-> Index Scan using ma_test_p3_b_idx on ma_test_p3 ma_test_3 (actual rows=10.00 loops=1)
Filter: (a >= (InitPlan 2).col1)
- Index Searches: 1
-(18 rows)
+(14 rows)
reset enable_seqscan;
reset enable_sort;
Sort Key: rangep_2.a
-> Index Scan using rangep_0_to_100_1_a_idx on rangep_0_to_100_1 rangep_2 (actual rows=0.00 loops=1)
Filter: (b = ANY (ARRAY[(InitPlan 1).col1, (InitPlan 2).col1]))
- Index Searches: 1
-> Index Scan using rangep_0_to_100_2_a_idx on rangep_0_to_100_2 rangep_3 (actual rows=0.00 loops=1)
Filter: (b = ANY (ARRAY[(InitPlan 1).col1, (InitPlan 2).col1]))
- Index Searches: 1
-> Index Scan using rangep_0_to_100_3_a_idx on rangep_0_to_100_3 rangep_4 (never executed)
Filter: (b = ANY (ARRAY[(InitPlan 1).col1, (InitPlan 2).col1]))
- Index Searches: 0
-> Index Scan using rangep_100_to_200_a_idx on rangep_100_to_200 rangep_5 (actual rows=0.00 loops=1)
Filter: (b = ANY (ARRAY[(InitPlan 1).col1, (InitPlan 2).col1]))
- Index Searches: 1
-(19 rows)
+(15 rows)
reset enable_sort;
drop table rangep;
Index Scan using onek2_u2_prtl on onek2 (actual rows=1.00 loops=1)
Index Cond: (unique2 = 11)
Filter: (stringu1 = 'ATAAAA'::name)
- Index Searches: 1
-(4 rows)
+(3 rows)
explain (costs off)
select unique2 from onek2 where unique2 = 11 and stringu1 = 'ATAAAA';
ln := regexp_replace(ln, 'Evictions: 0', 'Evictions: Zero');
ln := regexp_replace(ln, 'Evictions: \d+', 'Evictions: N');
ln := regexp_replace(ln, 'Memory Usage: \d+', 'Memory Usage: N');
- ln := regexp_replace(ln, 'Heap Fetches: \d+', 'Heap Fetches: N');
- ln := regexp_replace(ln, 'loops=\d+', 'loops=N');
- ln := regexp_replace(ln, 'Index Searches: \d+', 'Index Searches: N');
+ ln := regexp_replace(ln, 'Heap Fetches: \d+', 'Heap Fetches: N');
+ ln := regexp_replace(ln, 'loops=\d+', 'loops=N');
return next ln;
end loop;
end;
ln := regexp_replace(ln, 'Workers Launched: \d+', 'Workers Launched: N');
ln := regexp_replace(ln, 'actual rows=\d+(?:\.\d+)? loops=\d+', 'actual rows=N loops=N');
ln := regexp_replace(ln, 'Rows Removed by Filter: \d+', 'Rows Removed by Filter: N');
- perform regexp_matches(ln, 'Index Searches: \d+');
- if found then
- continue;
- end if;
return next ln;
end loop;
end;
projects / postgresql.git / commitdiff