From: | KONDO Mitsumasa <kondo(dot)mitsumasa(at)lab(dot)ntt(dot)co(dot)jp> |
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To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Improvement of pg_stat_statement usage about buffer hit ratio |
Date: | 2013-10-18 08:05:22 |
Message-ID: | 5260EBC2.9000808@lab.ntt.co.jp |
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Hi,
I submit improvement of pg_stat_statement usage patch in CF3.
In pg_stat_statement, I think buffer hit ratio is very important value. However,
it is difficult to calculate it, and it need complicated SQL. This patch makes it
more simple usage and documentation.
> -bench=# SELECT query, calls, total_time, rows, 100.0 * shared_blks_hit /
> - nullif(shared_blks_hit + shared_blks_read, 0) AS hit_percent
> +bench=# SELECT query, calls, total_time, rows, shared_blks_hit_percent
> FROM pg_stat_statements ORDER BY total_time DESC LIMIT 5;
It will be very simple:-)
This patch conflicts pg_stat_statement_min_max_exectime patch which I submitted,
and pg_stat_statement_min_max_exectime patch also adds new columns which are
min_time and max_time. So I'd like to change it in this opportunity.
Regards,
--
Mitsumasa KONDO
NTT Open Source Software Center
Attachment | Content-Type | Size |
---|---|---|
pg_stat_statements-blkhit.patch | text/x-diff | 11.5 KB |
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