Bruce Momjian <[EMAIL PROTECTED]> writes: > Sailesh Krishnamurthy wrote: >> Does pgsql only record X locks on the individual tuples on-disk or >> does it do so for S locks as well ?
> We don't need to shared lock individual rows because of MVCC --- well, > we sort of do by recording our xid in our proc structure, so folks don't > change things underneath us. We prevent expired rows from disappearing > from the disk by others looking at our proc start xid. This is actually an issue though. Row-level shared locks would be really nice to have for foreign-key handling. Right now we have to use X locks for those, and that leads to deadlocking problems for applications. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend