I'm running PG 7.4.1 on FreeBSD 5.2.1_RC1 and experienced a general 40% drop in performance after increasing Shared mem buffers to 2000 (from the 1000 default setting) and the Sort Mem to 1024 from 16. After changing the .conf file back to the original values, performance didn't change back. Only after dropping the database and reloading from dump, did performance return. Is this unusual behavior in anyone's opinion? (Note that I didn't forget to do a pg_ctl reload to have postmaster re-read the .conf file.)
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