Hi, My database stopped responding last night (Postgres 8.1.4). at 2 am, a vacuum began running: /usr/local/pgsql/bin/vacuumdb -afz When I came in to work this morning, I could query some tables but not others. There were many(100) processes like: postgres 11791 6901 0 02:07 ? 00:00:00 postgres: www-data yadb2 127.0.0.1(40883) SELECT waiting I began running an update yesterday that may or may not have completed. I was moving data out of one table into a new table, and setting an ID field to point to the new table. That may or may not have completed (it was done by this morning). It is not a regular occurence and today was the first time I saw this hanging behavior, so it's probably related. The postmaster was using a lot of CPU. I stopped the postmaster with a SIGINT, it stopped quickly and came back up automatically (I'm using daemontools) and everything is fine. I'm guessing it's something related to table locks. Any pointers on what I should be looking for to prevent this from happening again? What information I should be tracking to figure out what is exactly happening? Thanks very much, j
