Michael Fuhr <mike@xxxxxxxx> writes: > I'm wondering if the error means you're missing that function, which > is used to compare oid values. A system without oideq would be so dead in the water it's not funny --- consider that all the major catalogs are indexed by oid. It sounds to me that one particular index's "strategy map" (ie, its in-memory copy of the relevant indexable-operator info) got trashed. It's hard to guess why though. Could have been a hardware problem (RAM dropped a bit) or a software problem (wild store that happened to trash this data structure rather than anything else). regards, tom lane