Personally, I'd restart the postmaster, but not do more than that unless the error recurs.
Thanks for the response. I did restart the postmaster yesterday. Earlier this morning, a query that normally completes fine started to error out with 'invalid memory alloc request size 18446744073709551613'. Needless to say our database isn't quite that size. This query was against a table in a different database than the one that had the corruption warning yesterday. Restarting the postmaster again fixed the problem. For good measure I restarted the machine as well.
I need to decide what to do next, if anything. We have a hot standby that we also run queries against, and it hasn't shown any errors. I can switch over to that as the primary. Or I can move the main database to a different physical host.
