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Have TRUNCATE update pgstat tuple counters

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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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6
src/include/pgstat.h
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@ -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,