| From: | Nikolay Ulyanitsky <lystor(at)gmail(dot)com> |
|---|---|
| To: | FFW_Rude <FFW_Rude(at)hotmail(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Same query doing slow then quick |
| Date: | 2012-09-26 15:52:27 |
| Message-ID: | CA+Medix+6HXJT3F67c=Wn2XPtHeo+2qzB6f1YSS_XMNDA6xf6A@mail.gmail.com |
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| Lists: | pgsql-performance |
On 26 September 2012 18:38, FFW_Rude <FFW_Rude(at)hotmail(dot)com> wrote:
> root(at)testBI:/etc/postgresql/9.1/main# hdparm -tT /dev/sda
> Timing cached reads: 892 MB in 2.01 seconds = 444.42 MB/sec
> Timing buffered disk reads: 190 MB in 3.02 seconds = 62.90 MB/sec
It's OK for single HDD.
> Is fsync off by default ? I have
> #fsync = on (so it's off right ?).
Disable fsync for pgbench temporarily.
> pgbench is not found on my server. Do i have to apt-get install pgbench ?
Install the postgresql-contrib deb:
http://pkgs.org/download/postgresql-contrib
# sudo apt-get update
# sudo apt-get install postgresql-contrib
--
With best regards,
Nikolay
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