From: Sergio Mayoral <mayoralstuttgart@yahoo.com>
To: pgsql-performance@postgresql.org
Subject: execution time for first INSERT
Date: Fri, 8 Jul 2011 04:23:09 -0700 (PDT)
Message-ID: <1310124189.79849.YahooMailClassic@web39303.mail.mud.yahoo.com> (raw)
Hi,
i am using libpq library and postgresql 8.4 for my linux application running on ARM with 256 MB. I am just doing:
PQconnectdb();
PQexec(INSERT INTO table1 ....); (0.009661 sec.)
PQexec(INSERT INTO table1 ....); (0.004208 sec.)
PQexec(INSERT INTO table2 ....); (0.007352 sec.)
PQexec(INSERT INTO table2 ....); (0.002533 sec.)
PQexec(INSERT INTO table2 ....); (0.002281 sec.)
PQexec(INSERT INTO table2 ....); (0.002244 sec.)
PQexec(INSERT INTO table3 ....); (0.006903 sec.)
PQexec(INSERT INTO table3 ....); (0.002903 sec.)
PQfinnish();
I check the time for each PQexec with gettimeofday function and I always see that the first INSERT for each table needs longer than the next ones.
this must be something with the parser stage and since i am doing every time the same queries, I would like to know if there is a way to cache these queries in order to speed up the first INSERT.
Thanks in advance,
sma
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To: pgsql-performance@postgresql.org
Cc: mayoralstuttgart@yahoo.com
Subject: Re: execution time for first INSERT
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