Heikki Linnakangas wrote: > Alvaro Herrera wrote: > >However, given that Heikki just confirmed that CLUSTER does not freeze > >tuples, it's not really possible to do this, so I'll drop the CLUSTER > >patch for now. > > > >This means that people using CLUSTER to compact tables won't have the > >benefit of advancing relfrozenxid, so they will have to run VACUUM on > >those tables at some point anyway, even though there will be no dead > >tuples :-( > > Now that I think this a bit more, I think CLUSTER should freeze the > tuples. I was worried about losing valuable debug information by doing > that, but thinking a bit more that's not a big concern: we wouldn't > freeze tuples newer than recent xmin. The update chain logic is the most > risky part of the code, and we wouldn't lose the xmin and xmax of tuples > that are part of update chains. > > Patch attached. You'll need the changes to cluster.c to set the > relfrozenid as well.
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Thanks, committed. (I changed NULL for InvalidBuffer). -- Alvaro Herrera http://www.CommandPrompt.com/ PostgreSQL Replication, Consulting, Custom Development, 24x7 support ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
