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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2016-10-13 19:45:58 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2016-10-13 19:46:05 -0400 |
| commit | 81e82a2bd48865f9a294b63d9492f9fde6a32787 (patch) | |
| tree | 841f09a786aebaae2821b62edb5ae7fee6f915a4 /src | |
| parent | b1ee762a6138df073d4b2b80c235dd9025a8532c (diff) | |
| download | postgresql-81e82a2bd48865f9a294b63d9492f9fde6a32787.tar.gz postgresql-81e82a2bd48865f9a294b63d9492f9fde6a32787.zip | |
Fix handling of pgstat counters for TRUNCATE in a prepared transaction.
pgstat_twophase_postcommit is supposed to duplicate the math in
AtEOXact_PgStat, but it had missed out the bit about clearing
t_delta_live_tuples/t_delta_dead_tuples for a TRUNCATE.
It's harder than you might think to replicate the issue here, because
those counters would only be nonzero when a previous transaction in
the same backend had added/deleted tuples in the truncated table,
and those counts hadn't been sent to the stats collector yet.
Evident oversight in commit d42358efb. I've not added a regression
test for this; we tried to add one in d42358efb, and had to revert it
because it was too timing-sensitive for the buildfarm.
Back-patch to 9.5 where d42358efb came in.
Stas Kelvich
Discussion: <EB57BF68-C06D-4737-BDDC-4BA778F4E62B@postgrespro.ru>
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/postmaster/pgstat.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c index a9efee8304d..5112d6d96dd 100644 --- a/src/backend/postmaster/pgstat.c +++ b/src/backend/postmaster/pgstat.c @@ -2226,7 +2226,12 @@ pgstat_twophase_postcommit(TransactionId xid, uint16 info, 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; - + if (rec->t_truncated) + { + /* forget live/dead stats seen by backend thus far */ + pgstat_info->t_counts.t_delta_live_tuples = 0; + pgstat_info->t_counts.t_delta_dead_tuples = 0; + } pgstat_info->t_counts.t_delta_live_tuples += rec->tuples_inserted - rec->tuples_deleted; pgstat_info->t_counts.t_delta_dead_tuples += |