Re: pg_stat_statements: calls under-estimation propagation

From: samthakur74 <samthakur74(at)gmail(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: Re: pg_stat_statements: calls under-estimation propagation
Date: 2013-09-23 07:56:13
Message-ID: CABzZFEuTO3a9+jFhyGA-RaCbWSx_qpe2hTpUrxyE4TQPf8cLRA@mail.gmail.com
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>
> I forgot about removal of the relevant SGML, amended here in v6.

Thank you for this!
i did a quick test with following steps:
1. Applied v6 patch
2. make and make install on pg_stat_statements;
3. Restarted Postgres with pg_stat_statements loaded with
pg_stat_statements.max = 4
4. Dropped and created extension pg_stat_statements.

Executed following:
select * from pg_stat_statements_reset();
select * from pgbench_branches ;
select * from pgbench_history ;
select * from pgbench_tellers ;
select * from pgbench_accounts;

I expected 4 rows in pg_stat_statements view for each of 4 queries
above. But i saw just 2 rows.

select * from pg_stat_statements;

userid | dbid | stat_session_id | query | quer
y_id | calls | total_time | rows | shared_blks_hit | shared_blks_read |
shared_blks_dirtied | shared_blks_written | local_blks_hit | local_blks_read | l
ocal_blks_dirtied | local_blks_written | temp_blks_read | temp_blks_written | bl
k_read_time | blk_write_time
--------+-------+-----------------+---------------------------------+-----------
-----------+-------+------------+--------+-----------------+------------------+-
--------------------+---------------------+----------------+-----------------+--
------------------+--------------------+----------------+-------------------+---
------------+----------------
10 | 12900 | 21595345 | select * from pgbench_accounts; | -803800319
3522943111 | 1 | 108.176 | 100000 | 1640 | 0 |
0 | 0 | 0 | 0 |
0 | 0 | 0 | 0 |
0 | 0
10 | 12900 | 21595345 | select * from pgbench_tellers ; | -149722997
7134331757 | 1 | 0.227 | 10 | 1 | 0 |
0 | 0 | 0 | 0 |
0 | 0 | 0 | 0 |
0 | 0
(2 rows)

Am i doing something wrong?

regards
Sameer

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