update queries taking lot of time

Hi,

I am running update query of the form "update tablename set x = y where
exists (select .....)"
These queries are taking lots of time. I dropped all indices on the table
which provided some improvement but not remarkable performance. I am looking
for ways to improve it. Can someone suggest what all can be done to improve
it. These queries are being executed from within a pl/pgsql function.

Regards,
Vinita Bansal

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