Обсуждение: Postgresql going to sleep?
I'm consistently getting into a situation where the database client just goes to sleep in a query after some number of queries in quick succession. Using PostgreSQL 7.2.3 on Red Hat Linux 8.0. The postgres process shows up as ``idle in transaction'' in a ps. Are there any tools I can use to figure out what's going on with the client/server? pgmonitor doesn't give any additional information (except ``no query is being executed''). Regards, -- Raju -- Raj Mathur raju@kandalaya.org http://kandalaya.org/ GPG: 78D4 FC67 367F 40E2 0DD5 0FEF C968 D0EF CC68 D17F All your domain are belong to us. It is the mind that moves
Raj Mathur <raju@linux-delhi.org> writes:
> I'm consistently getting into a situation where the database client
> just goes to sleep in a query after some number of queries in quick
> succession. Using PostgreSQL 7.2.3 on Red Hat Linux 8.0. The
> postgres process shows up as ``idle in transaction'' in a ps.
In that case, the backend is waiting for input from the client.
If the client thinks it is waiting for the backend, I'd wonder about a
missing "fflush" or something like that. What client software are you
using?
regards, tom lane
>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:
Tom> Raj Mathur <raju@linux-delhi.org> writes:
>> I'm consistently getting into a situation where the database
>> client just goes to sleep in a query after some number of
>> queries in quick succession. Using PostgreSQL 7.2.3 on Red Hat
>> Linux 8.0. The postgres process shows up as ``idle in
>> transaction'' in a ps.
Tom> In that case, the backend is waiting for input from the
Tom> client.
Tom> If the client thinks it is waiting for the backend, I'd
Tom> wonder about a missing "fflush" or something like that. What
Tom> client software are you using?
Using Perl 5.8.0 and DBI 1.32. Any known problems with this setup?
-- Raju
--
Raj Mathur raju@kandalaya.org http://kandalaya.org/
GPG: 78D4 FC67 367F 40E2 0DD5 0FEF C968 D0EF CC68 D17F
All your domain are belong to us.
It is the mind that moves
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>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:
Tom> Raj Mathur <raju@linux-delhi.org> writes:
>> I'm consistently getting into a situation where the database
>> client just goes to sleep in a query after some number of
>> queries in quick succession. Using PostgreSQL 7.2.3 on Red Hat
>> Linux 8.0. The postgres process shows up as ``idle in
>> transaction'' in a ps.
Tom> In that case, the backend is waiting for input from the
Tom> client.
Tom> If the client thinks it is waiting for the backend, I'd
Tom> wonder about a missing "fflush" or something like that. What
Tom> client software are you using?
Thanks for the tip... I had a closer look at the client (did I mention
I was running Perl/DBI as a CGI?) and found that there's some issue in
the way Apache handles stderr prints from a CGI: if the CGI takes a
long time to execute and generates too much output on stderr, Apache
just puts it to sleep. I have all my SQL statements being printed to
the Apache log before execution, and after a while the log buffer or
whatever would just fill up and suspend the process.
Figuring out a workaround (better than the open STDERR,">/tmp/STDERR"
route :) for this, but the program is working as it should now. Or at
least working, trying to make it comply with the requirements :) At
least it's not a PgSQL problem.
Regards,
- -- Raju
- --
Raj Mathur raju@kandalaya.org http://kandalaya.org/
GPG: 78D4 FC67 367F 40E2 0DD5 0FEF C968 D0EF CC68 D17F
All your domain are belong to us.
It is the mind that moves
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