"Rob Owen" <Rob.Owen@xxxxxxx> writes: > PostgreSQL 8.0.3 running on AIX 5.3 (same thing happens on 5.1 though). > DBMS was running fine for some months but now one of the databases isn't accessible. Any help would be greatly appreciated. Just one database? Sounds like it might be corrupt data in that database's system catalogs. Can you get a stack trace from the point of the error to help us narrow it down? The way I usually debug startup-time failures is: export PGOPTIONS="-W 30" psql ... Now I have 30 seconds to identify the PID of the backend process in another window and do (as the postgres user) gdb /path/to/postgres PID Once you've got gdb control of the backend, do gdb> break errfinish gdb> cont ... wait for the timeout to finish elapsing, if needed ... Once gdb reports that the breakpoint has been reached, say gdb> bt ... useful info here... gdb> cont regards, tom lane