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Have TRUNCATE update pgstat tuple counters

Browse Source 
This works by keeping a per-subtransaction record of the ins/upd/del
counters before the truncate, and then resetting them; this record is
useful to return to the previous state in case the truncate is rolled
back, either in a subtransaction or whole transaction.  The state is
propagated upwards as subtransactions commit.

When the per-table data is sent to the stats collector, a flag indicates
to reset the live/dead counters to zero as well.

Catalog version bumped due to the change in pgstat format.

Author: Alexander Shulgin
Discussion: 1007.1207238291@sss.pgh.pa.us
Discussion: 548F7D38.2000401@BlueTreble.com
Reviewed-by: Álvaro Herrera, Jim Nasby
This commit is contained in:
Alvaro Herrera 2015-02-20 12:10:01 -03:00
parent 5740be6d6e
commit d42358efb1
8 changed files with 374 additions and 3 deletions
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3
src/backend/commands/tablecmds.c
View File

@ -71,6 +71,7 @@
#include "parser/parse_type.h"
#include "parser/parse_utilcmd.h"
#include "parser/parser.h"
#include "pgstat.h"
#include "rewrite/rewriteDefine.h"
#include "rewrite/rewriteHandler.h"
#include "rewrite/rewriteManip.h"
@ -1220,6 +1221,8 @@ ExecuteTruncate(TruncateStmt *stmt)
*/
reindex_relation(heap_relid, REINDEX_REL_PROCESS_TOAST);
}
pgstat_count_truncate(rel);
}
/*

110
src/backend/postmaster/pgstat.c
View File

@ -197,8 +197,12 @@ typedef struct TwoPhasePgStatRecord
PgStat_Counter tuples_inserted; /* tuples inserted in xact */
PgStat_Counter tuples_updated; /* tuples updated in xact */
PgStat_Counter tuples_deleted; /* tuples deleted in xact */
PgStat_Counter inserted_pre_trunc; /* tuples inserted prior to truncate */
PgStat_Counter updated_pre_trunc; /* tuples updated prior to truncate */
PgStat_Counter deleted_pre_trunc; /* tuples deleted prior to truncate */
Oid t_id; /* table's OID */
bool t_shared; /* is it a shared catalog? */
bool t_truncated; /* was the relation truncated? */
} TwoPhasePgStatRecord;
/*
@ -1858,6 +1862,64 @@ pgstat_count_heap_delete(Relation rel)
}
}
/*
* pgstat_truncate_save_counters
*
* Whenever a table is truncated, we save its i/u/d counters so that they can
* be cleared, and if the (sub)xact that executed the truncate later aborts,
* the counters can be restored to the saved (pre-truncate) values. Note we do
* this on the first truncate in any particular subxact level only.
*/
static void
pgstat_truncate_save_counters(PgStat_TableXactStatus *trans)
{
if (!trans->truncated)
{
trans->inserted_pre_trunc = trans->tuples_inserted;
trans->updated_pre_trunc = trans->tuples_updated;
trans->deleted_pre_trunc = trans->tuples_deleted;
trans->truncated = true;
}
}
/*
* pgstat_truncate_restore_counters - restore counters when a truncate aborts
*/
static void
pgstat_truncate_restore_counters(PgStat_TableXactStatus *trans)
{
if (trans->truncated)
{
trans->tuples_inserted = trans->inserted_pre_trunc;
trans->tuples_updated = trans->updated_pre_trunc;
trans->tuples_deleted = trans->deleted_pre_trunc;
}
}
/*
* pgstat_count_truncate - update tuple counters due to truncate
*/
void
pgstat_count_truncate(Relation rel)
{
PgStat_TableStatus *pgstat_info = rel->pgstat_info;
if (pgstat_info != NULL)
{
/* We have to log the effect at the proper transactional level */
int nest_level = GetCurrentTransactionNestLevel();
if (pgstat_info->trans == NULL ||
pgstat_info->trans->nest_level != nest_level)
add_tabstat_xact_level(pgstat_info, nest_level);
pgstat_truncate_save_counters(pgstat_info->trans);
pgstat_info->trans->tuples_inserted = 0;
pgstat_info->trans->tuples_updated = 0;
pgstat_info->trans->tuples_deleted = 0;
}
}
/*
* pgstat_update_heap_dead_tuples - update dead-tuples count
*
@ -1916,12 +1978,22 @@ AtEOXact_PgStat(bool isCommit)
Assert(trans->upper == NULL);
tabstat = trans->parent;
Assert(tabstat->trans == trans);
/* restore pre-truncate stats (if any) in case of aborted xact */
if (!isCommit)
pgstat_truncate_restore_counters(trans);
/* count attempted actions regardless of commit/abort */
tabstat->t_counts.t_tuples_inserted += trans->tuples_inserted;
tabstat->t_counts.t_tuples_updated += trans->tuples_updated;
tabstat->t_counts.t_tuples_deleted += trans->tuples_deleted;
if (isCommit)
{
tabstat->t_counts.t_truncated = trans->truncated;
if (trans->truncated)
{
/* forget live/dead stats seen by backend thus far */
tabstat->t_counts.t_delta_live_tuples = 0;
tabstat->t_counts.t_delta_dead_tuples = 0;
}
/* insert adds a live tuple, delete removes one */
tabstat->t_counts.t_delta_live_tuples +=
trans->tuples_inserted - trans->tuples_deleted;
@ -1986,9 +2058,21 @@ AtEOSubXact_PgStat(bool isCommit, int nestDepth)
{
if (trans->upper && trans->upper->nest_level == nestDepth - 1)
{
trans->upper->tuples_inserted += trans->tuples_inserted;
trans->upper->tuples_updated += trans->tuples_updated;
trans->upper->tuples_deleted += trans->tuples_deleted;
if (trans->truncated)
{
/* propagate the truncate status one level up */
pgstat_truncate_save_counters(trans->upper);
/* replace upper xact stats with ours */
trans->upper->tuples_inserted = trans->tuples_inserted;
trans->upper->tuples_updated = trans->tuples_updated;
trans->upper->tuples_deleted = trans->tuples_deleted;
}
else
{
trans->upper->tuples_inserted += trans->tuples_inserted;
trans->upper->tuples_updated += trans->tuples_updated;
trans->upper->tuples_deleted += trans->tuples_deleted;
}
tabstat->trans = trans->upper;
pfree(trans);
}
@ -2017,6 +2101,8 @@ AtEOSubXact_PgStat(bool isCommit, int nestDepth)
* subtransaction
*/
/* first restore values obliterated by truncate */
pgstat_truncate_restore_counters(trans);
/* count attempted actions regardless of commit/abort */
tabstat->t_counts.t_tuples_inserted += trans->tuples_inserted;
tabstat->t_counts.t_tuples_updated += trans->tuples_updated;
@ -2065,8 +2151,12 @@ AtPrepare_PgStat(void)
record.tuples_inserted = trans->tuples_inserted;
record.tuples_updated = trans->tuples_updated;
record.tuples_deleted = trans->tuples_deleted;
record.inserted_pre_trunc = trans->inserted_pre_trunc;
record.updated_pre_trunc = trans->updated_pre_trunc;
record.deleted_pre_trunc = trans->deleted_pre_trunc;
record.t_id = tabstat->t_id;
record.t_shared = tabstat->t_shared;
record.t_truncated = trans->truncated;
RegisterTwoPhaseRecord(TWOPHASE_RM_PGSTAT_ID, 0,
&record, sizeof(TwoPhasePgStatRecord));
@ -2132,6 +2222,8 @@ pgstat_twophase_postcommit(TransactionId xid, uint16 info,
pgstat_info->t_counts.t_tuples_inserted += rec->tuples_inserted;
pgstat_info->t_counts.t_tuples_updated += rec->tuples_updated;
pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
pgstat_info->t_counts.t_truncated = rec->t_truncated;
pgstat_info->t_counts.t_delta_live_tuples +=
rec->tuples_inserted - rec->tuples_deleted;
pgstat_info->t_counts.t_delta_dead_tuples +=
@ -2158,6 +2250,12 @@ pgstat_twophase_postabort(TransactionId xid, uint16 info,
pgstat_info = get_tabstat_entry(rec->t_id, rec->t_shared);
/* Same math as in AtEOXact_PgStat, abort case */
if (rec->t_truncated)
{
rec->tuples_inserted = rec->inserted_pre_trunc;
rec->tuples_updated = rec->updated_pre_trunc;
rec->tuples_deleted = rec->deleted_pre_trunc;
}
pgstat_info->t_counts.t_tuples_inserted += rec->tuples_inserted;
pgstat_info->t_counts.t_tuples_updated += rec->tuples_updated;
pgstat_info->t_counts.t_tuples_deleted += rec->tuples_deleted;
@ -4658,6 +4756,12 @@ pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
tabentry->tuples_updated += tabmsg->t_counts.t_tuples_updated;
tabentry->tuples_deleted += tabmsg->t_counts.t_tuples_deleted;
tabentry->tuples_hot_updated += tabmsg->t_counts.t_tuples_hot_updated;
/* If table was truncated, first reset the live/dead counters */
if (tabmsg->t_counts.t_truncated)
{
tabentry->n_live_tuples = 0;
tabentry->n_dead_tuples = 0;
}
tabentry->n_live_tuples += tabmsg->t_counts.t_delta_live_tuples;
tabentry->n_dead_tuples += tabmsg->t_counts.t_delta_dead_tuples;
tabentry->changes_since_analyze += tabmsg->t_counts.t_changed_tuples;

6
src/include/pgstat.h
View File

@ -104,6 +104,7 @@ typedef struct PgStat_TableCounts
PgStat_Counter t_tuples_updated;
PgStat_Counter t_tuples_deleted;
PgStat_Counter t_tuples_hot_updated;
bool t_truncated;
PgStat_Counter t_delta_live_tuples;
PgStat_Counter t_delta_dead_tuples;
@ -165,6 +166,10 @@ typedef struct PgStat_TableXactStatus
PgStat_Counter tuples_inserted; /* tuples inserted in (sub)xact */
PgStat_Counter tuples_updated; /* tuples updated in (sub)xact */
PgStat_Counter tuples_deleted; /* tuples deleted in (sub)xact */
bool truncated; /* relation truncated in this (sub)xact */
PgStat_Counter inserted_pre_trunc; /* tuples inserted prior to truncate */
PgStat_Counter updated_pre_trunc; /* tuples updated prior to truncate */
PgStat_Counter deleted_pre_trunc; /* tuples deleted prior to truncate */
int nest_level; /* subtransaction nest level */
/* links to other structs for same relation: */
struct PgStat_TableXactStatus *upper; /* next higher subxact if any */
@ -960,6 +965,7 @@ extern void pgstat_initstats(Relation rel);
extern void pgstat_count_heap_insert(Relation rel, int n);
extern void pgstat_count_heap_update(Relation rel, bool hot);
extern void pgstat_count_heap_delete(Relation rel);
extern void pgstat_count_truncate(Relation rel);
extern void pgstat_update_heap_dead_tuples(Relation rel, int delta);
extern void pgstat_init_function_usage(FunctionCallInfoData *fcinfo,

50
src/test/regress/expected/prepared_xacts.out
View File

@ -247,8 +247,58 @@ SELECT gid FROM pg_prepared_xacts;
-----
(0 rows)
CREATE TABLE pxtest5 (a SERIAL);
INSERT INTO pxtest5 DEFAULT VALUES;
SELECT * FROM pxtest5;
a
---
1
(1 row)
BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
INSERT INTO pxtest5 DEFAULT VALUES;
INSERT INTO pxtest5 DEFAULT VALUES;
TRUNCATE pxtest5;
INSERT INTO pxtest5 DEFAULT VALUES;
PREPARE TRANSACTION 'trunc-and-pgstat';
SELECT pg_sleep(0.5);
pg_sleep
----------
(1 row)
SELECT n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname='pxtest5';
n_tup_ins | n_tup_upd | n_tup_del | n_live_tup | n_dead_tup
-----------+-----------+-----------+------------+------------
1 | 0 | 0 | 1 | 0
(1 row)
COMMIT PREPARED 'trunc-and-pgstat';
SELECT pg_sleep(0.5);
pg_sleep
----------
(1 row)
SELECT n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname='pxtest5';
n_tup_ins | n_tup_upd | n_tup_del | n_live_tup | n_dead_tup
-----------+-----------+-----------+------------+------------
2 | 0 | 0 | 1 | 0
(1 row)
SELECT * FROM pxtest5;
a
---
4
(1 row)
-- Clean up
DROP TABLE pxtest2;
DROP TABLE pxtest3; -- will still be there if prepared xacts are disabled
ERROR: table "pxtest3" does not exist
DROP TABLE pxtest4;
DROP TABLE pxtest5;

53
src/test/regress/expected/prepared_xacts_1.out
View File

@ -249,9 +249,62 @@ SELECT gid FROM pg_prepared_xacts;
-----
(0 rows)
CREATE TABLE pxtest5 (a SERIAL);
INSERT INTO pxtest5 DEFAULT VALUES;
SELECT * FROM pxtest5;
a
---
1
(1 row)
BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
INSERT INTO pxtest5 DEFAULT VALUES;
INSERT INTO pxtest5 DEFAULT VALUES;
TRUNCATE pxtest5;
INSERT INTO pxtest5 DEFAULT VALUES;
PREPARE TRANSACTION 'trunc-and-pgstat';
ERROR: prepared transactions are disabled
HINT: Set max_prepared_transactions to a nonzero value.
SELECT pg_sleep(0.5);
pg_sleep
----------
(1 row)
SELECT n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname='pxtest5';
n_tup_ins | n_tup_upd | n_tup_del | n_live_tup | n_dead_tup
-----------+-----------+-----------+------------+------------
3 | 0 | 0 | 1 | 2
(1 row)
COMMIT PREPARED 'trunc-and-pgstat';
ERROR: prepared transaction with identifier "trunc-and-pgstat" does not exist
SELECT pg_sleep(0.5);
pg_sleep
----------
(1 row)
SELECT n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname='pxtest5';
n_tup_ins | n_tup_upd | n_tup_del | n_live_tup | n_dead_tup
-----------+-----------+-----------+------------+------------
3 | 0 | 0 | 1 | 2
(1 row)
SELECT * FROM pxtest5;
a
---
1
(1 row)
-- Clean up
DROP TABLE pxtest2;
ERROR: table "pxtest2" does not exist
DROP TABLE pxtest3; -- will still be there if prepared xacts are disabled
DROP TABLE pxtest4;
ERROR: table "pxtest4" does not exist
DROP TABLE pxtest5;

64
src/test/regress/expected/stats.out
View File

@ -62,6 +62,57 @@ begin
extract(epoch from clock_timestamp() - start_time);
end
$$ language plpgsql;
-- test effects of TRUNCATE on n_live_tup/n_dead_tup counters
CREATE TABLE trunc_stats_test(id serial);
CREATE TABLE trunc_stats_test1(id serial);
CREATE TABLE trunc_stats_test2(id serial);
CREATE TABLE trunc_stats_test3(id serial);
CREATE TABLE trunc_stats_test4(id serial);
-- check that n_live_tup is reset to 0 after truncate
INSERT INTO trunc_stats_test DEFAULT VALUES;
INSERT INTO trunc_stats_test DEFAULT VALUES;
INSERT INTO trunc_stats_test DEFAULT VALUES;
TRUNCATE trunc_stats_test;
-- test involving a truncate in a transaction; 4 ins but only 1 live
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
UPDATE trunc_stats_test1 SET id = id + 10 WHERE id IN (1, 2);
DELETE FROM trunc_stats_test1 WHERE id = 3;
BEGIN;
UPDATE trunc_stats_test1 SET id = id + 100;
TRUNCATE trunc_stats_test1;
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
COMMIT;
-- use a savepoint: 1 insert, 1 live
BEGIN;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
SAVEPOINT p1;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
TRUNCATE trunc_stats_test2;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
RELEASE SAVEPOINT p1;
COMMIT;
-- rollback a savepoint: this should count 4 inserts and have 2
-- live tuples after commit (and 2 dead ones due to aborted subxact)
BEGIN;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
SAVEPOINT p1;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
TRUNCATE trunc_stats_test3;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
ROLLBACK TO SAVEPOINT p1;
COMMIT;
-- rollback a truncate: this should count 2 inserts and produce 2 dead tuples
BEGIN;
INSERT INTO trunc_stats_test4 DEFAULT VALUES;
INSERT INTO trunc_stats_test4 DEFAULT VALUES;
TRUNCATE trunc_stats_test4;
INSERT INTO trunc_stats_test4 DEFAULT VALUES;
ROLLBACK;
-- do a seqscan
SELECT count(*) FROM tenk2;
count
@ -92,6 +143,18 @@ SELECT wait_for_stats();
(1 row)
-- check effects
SELECT relname, n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname like 'trunc_stats_test%' order by relname;
relname | n_tup_ins | n_tup_upd | n_tup_del | n_live_tup | n_dead_tup
-------------------+-----------+-----------+-----------+------------+------------
trunc_stats_test | 3 | 0 | 0 | 0 | 0
trunc_stats_test1 | 4 | 2 | 1 | 1 | 0
trunc_stats_test2 | 1 | 0 | 0 | 1 | 0
trunc_stats_test3 | 4 | 0 | 0 | 2 | 2
trunc_stats_test4 | 2 | 0 | 0 | 0 | 2
(5 rows)
SELECT st.seq_scan >= pr.seq_scan + 1,
st.seq_tup_read >= pr.seq_tup_read + cl.reltuples,
st.idx_scan >= pr.idx_scan + 1,
@ -119,4 +182,5 @@ FROM prevstats AS pr;
t
(1 row)
DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4;
-- End of Stats Test

27
src/test/regress/sql/prepared_xacts.sql
View File

@ -152,7 +152,34 @@ SELECT * FROM pxtest3;
-- There should be no prepared transactions
SELECT gid FROM pg_prepared_xacts;
CREATE TABLE pxtest5 (a SERIAL);
INSERT INTO pxtest5 DEFAULT VALUES;
SELECT * FROM pxtest5;
BEGIN TRANSACTION ISOLATION LEVEL SERIALIZABLE;
INSERT INTO pxtest5 DEFAULT VALUES;
INSERT INTO pxtest5 DEFAULT VALUES;
TRUNCATE pxtest5;
INSERT INTO pxtest5 DEFAULT VALUES;
PREPARE TRANSACTION 'trunc-and-pgstat';
SELECT pg_sleep(0.5);
SELECT n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname='pxtest5';
COMMIT PREPARED 'trunc-and-pgstat';
SELECT pg_sleep(0.5);
SELECT n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname='pxtest5';
SELECT * FROM pxtest5;
-- Clean up
DROP TABLE pxtest2;
DROP TABLE pxtest3; -- will still be there if prepared xacts are disabled
DROP TABLE pxtest4;
DROP TABLE pxtest5;

64
src/test/regress/sql/stats.sql
View File

@ -58,6 +58,64 @@ begin
end
$$ language plpgsql;
-- test effects of TRUNCATE on n_live_tup/n_dead_tup counters
CREATE TABLE trunc_stats_test(id serial);
CREATE TABLE trunc_stats_test1(id serial);
CREATE TABLE trunc_stats_test2(id serial);
CREATE TABLE trunc_stats_test3(id serial);
CREATE TABLE trunc_stats_test4(id serial);
-- check that n_live_tup is reset to 0 after truncate
INSERT INTO trunc_stats_test DEFAULT VALUES;
INSERT INTO trunc_stats_test DEFAULT VALUES;
INSERT INTO trunc_stats_test DEFAULT VALUES;
TRUNCATE trunc_stats_test;
-- test involving a truncate in a transaction; 4 ins but only 1 live
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
UPDATE trunc_stats_test1 SET id = id + 10 WHERE id IN (1, 2);
DELETE FROM trunc_stats_test1 WHERE id = 3;
BEGIN;
UPDATE trunc_stats_test1 SET id = id + 100;
TRUNCATE trunc_stats_test1;
INSERT INTO trunc_stats_test1 DEFAULT VALUES;
COMMIT;
-- use a savepoint: 1 insert, 1 live
BEGIN;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
SAVEPOINT p1;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
TRUNCATE trunc_stats_test2;
INSERT INTO trunc_stats_test2 DEFAULT VALUES;
RELEASE SAVEPOINT p1;
COMMIT;
-- rollback a savepoint: this should count 4 inserts and have 2
-- live tuples after commit (and 2 dead ones due to aborted subxact)
BEGIN;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
SAVEPOINT p1;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
TRUNCATE trunc_stats_test3;
INSERT INTO trunc_stats_test3 DEFAULT VALUES;
ROLLBACK TO SAVEPOINT p1;
COMMIT;
-- rollback a truncate: this should count 2 inserts and produce 2 dead tuples
BEGIN;
INSERT INTO trunc_stats_test4 DEFAULT VALUES;
INSERT INTO trunc_stats_test4 DEFAULT VALUES;
TRUNCATE trunc_stats_test4;
INSERT INTO trunc_stats_test4 DEFAULT VALUES;
ROLLBACK;
-- do a seqscan
SELECT count(*) FROM tenk2;
-- do an indexscan
@ -71,12 +129,17 @@ SELECT pg_sleep(1.0);
SELECT wait_for_stats();
-- check effects
SELECT relname, n_tup_ins, n_tup_upd, n_tup_del, n_live_tup, n_dead_tup
FROM pg_stat_user_tables
WHERE relname like 'trunc_stats_test%' order by relname;
SELECT st.seq_scan >= pr.seq_scan + 1,
st.seq_tup_read >= pr.seq_tup_read + cl.reltuples,
st.idx_scan >= pr.idx_scan + 1,
st.idx_tup_fetch >= pr.idx_tup_fetch + 1
FROM pg_stat_user_tables AS st, pg_class AS cl, prevstats AS pr
WHERE st.relname='tenk2' AND cl.relname='tenk2';
SELECT st.heap_blks_read + st.heap_blks_hit >= pr.heap_blks + cl.relpages,
st.idx_blks_read + st.idx_blks_hit >= pr.idx_blks + 1
FROM pg_statio_user_tables AS st, pg_class AS cl, prevstats AS pr
@ -85,4 +148,5 @@ SELECT st.heap_blks_read + st.heap_blks_hit >= pr.heap_blks + cl.relpages,
SELECT pr.snap_ts < pg_stat_get_snapshot_timestamp() as snapshot_newer
FROM prevstats AS pr;
DROP TABLE trunc_stats_test, trunc_stats_test1, trunc_stats_test2, trunc_stats_test3, trunc_stats_test4;
-- End of Stats Test