Re: Transaction commits VS Transaction commits (with parallel) VSquery mean time

Hi Haribabu,

The latest patch fails while applying header files part. Kindly rebase.

The patch looks good to me. However, I wonder what are the other scenarios where xact_commit is incremented because even if I commit a single transaction with your patch applied the increment in xact_commit is > 1. As you mentioned upthread, need to check what internal operation resulted in the increase. But the increase in xact_commit is surely lesser with the patch.

 
postgres=# BEGIN;
BEGIN
postgres=# select xact_commit from pg_stat_database where datname = 'postgres';
 xact_commit 
-------------
         158
(1 row)

postgres=# explain analyze select * from foo where i = 1000;
                                                       QUERY PLAN                                                       
------------------------------------------------------------------------------------------------------------------------
 Gather  (cost=1000.00..136417.85 rows=1 width=37) (actual time=4.596..3792.710 rows=1 loops=1)
   Workers Planned: 2
   Workers Launched: 2
   ->  Parallel Seq Scan on foo  (cost=0.00..135417.75 rows=1 width=37) (actual time=2448.038..3706.009 rows=0 loops=3)
         Filter: (i = 1000)
         Rows Removed by Filter: 3333333
 Planning Time: 0.353 ms
 Execution Time: 3793.572 ms
(8 rows)

postgres=# commit;
COMMIT
postgres=# select xact_commit from pg_stat_database where datname = 'postgres';
 xact_commit 
-------------
         161
(1 row)