Bruce Momjian wrote: > > You don't need to scan the whole page like in the lossy bitmap mode, > > just all the tuples in the HOT-chain. > > > > You need to somehow pass the information that multiple indexes have been > > used in the bitmap scan to the bitmap heapscan node, so that it knows > > when the extra checking is required. > > That might be confusing because you are going to have some tids that are > chains, and some that aren't. The hard part is making sure you don't > include the same tid twice. > > Another idea is to set pg_index xid to FrozenTransactionId once the > VACUUM happens, and if it not frozen, do something special for bitmap > scans.
Anyway, perhaps we can leave the bitmap scan part to someone more familiar with that part of the code, like Tom. HOT is a huge feature, so let's keep working on it. The patch doesn't have to be 100% on April 1, but we certainly want to try to get as far as we can by then. -- Bruce Momjian <[EMAIL PROTECTED]> http://momjian.us EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
