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Background: We are running a
web application on apache with database server as PostgreSQL. The application
is a expense claim application with workflow. The software versions are
specified below: Red Hat Linux release 7.3 Apache 1.3.20 PostgreSQL 7.1.3 Problem: When the
application is accessed by many users like say 40, the PostgreSQL database freezes.
Description of Process happening behind: The
application mainly puts load on one table (worklist) where the steps were
created for each expense claim initiated. While creating each step for claim
there is exclusive row lock and at the end inserts a new step. Both these
statements are in one transaction. When the apache hangs in between the
deadlock remains. In this way there are many deadlocks created which makes the
database to finally freeze. To resolve this we were restarting the PostgreSQl
db. Sometime the apache also hangs. Then we were restarting the apache. There
is no log created in postgreSQL. Whereas our application records an error log: ‘Failed
to gain exclusive table row lock’ We were guessing that the database hanging is due to
deadlock issue. But not sure of it. I have attached the postgreSQL.conf file for your reference
to check the settings. Please let me know what might be the reason and how to check
and resolve it. Thanks and Best Regards, Anu |
postgresql.conf
Description: postgresql.conf
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