On Mon, 2006-06-19 at 14:36 +0900, ITAGAKI Takahiro wrote: > Simon Riggs <[EMAIL PROTECTED]> wrote: > > > > 2. Store the structures in AM's meta page. But heaps don't have meta > > > pages. > > > > But perhaps they should? That sounds very similar to the idea of > > non-transactional pg_class data. > > Presently, I suppose the parameters are not modified so many times. > They are set only on build time or maintenance. > > I think we will need metapages in the future, but not right now. If we will > provide an automatic configurator for fillfactors (or other parameters), > parameters might be changed every time the configurator runs, for example, > per autovacuum.
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Yes, I can see that future too. > > The metagpages thought would require some consolidation from various > > other proposals, so we'll need to wait for wider discussion on that. > > I agree, but it is easy to move the metadata from catalog to metapages. > So the metapages thought can be reconciled among proposals that must need it. > (pg_class_nt and dead tuples bitmaps?) I've copied in Alvaro to comment on possible cross-overs between these projects... Looks like we've got a class of data that is similar in its frequency of change to the pg_class_nt stuff. Also, the discussion about having some of this type of info cached in shared memory seems to have dried up. Should we now go for pg_class_nt plus shared memory cache? -- Simon Riggs EnterpriseDB http://www.enterprisedb.com ---------------------------(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
