Christopher Kings-Lynne wrote: > > I remember going through this. Other backends will use pg_subtrans to > > know what transactions are in progress. They have to do the standard > > lookups to find the status of the parent transaction. The backend-local > > list of xids is needed so the commit can clean up those subtransaction > > xids so that later transactions don't have to use pg_subtrans. > > Is there some solution whereby the common case (99.999% of transactions > won't be subtransactoins) is fast, and the uncommon case of being in a > subtransaction is slower?
Yes, we use an unreserved clog status to indicate a pg_subtrans lookup is required. In non-subtrans cases, no pg_subtrans lookup is required. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
