Jan Wieck wrote: > On 6/25/2006 10:12 PM, Bruce Momjian wrote: > > When you are using the update chaining, you can't mark that index row as > > dead because it actually points to more than one row on the page, some > > are non-visible, some are visible. > > Back up the truck ... you mean in the current code base we have heap > tuples that are visible in index scans because of heap tuple chaining > but without index tuples pointing directly at them?
No, this would be new code added. The basic idea is with the new same-page update chaining, a single index points to the head of a chain, not to a single tuple, so you can't mark a tuple as pointing to dead rows if any of the tuples in the chain are visible. -- Bruce Momjian [EMAIL PROTECTED] EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---------------------------(end of broadcast)--------------------------- TIP 4: Have you searched our list archives? http://archives.postgresql.org
