How many records to delete ? - Mailing list pgsql-general

I am writing a shell script which runs as a cron entry. The objective
is to delete older records from postgresql DB.

I have thousands of records. What is the optimum number of records to
delete in one delete command

( my script will delete records in a loop and I want to ensure that
the swap file created during delete will not cause delete failure
during low disk space condition )

thanks
Shul