>Are there a lot of tuples in the table that have been inserted or updated by still-open transactions? Yes, there are likely to be inserts. That table is a log capture table used by our replication software, so essentially every update/delete/insert will have a record inserted into the table. It has no updates. The only thing that deletes from it is the process that had all the semop calls. We¹ll look into the postgres minor upgrade and recompile, thanks.
