Has this been done yet? I don't think so. ---------------------------------------------------------------------------
Tom Lane wrote: > Neil Conway <[EMAIL PROTECTED]> writes: > > On Thu, 2007-26-04 at 18:07 -0400, Neil Conway wrote: > >> (1) I believe the reasoning for Tom's earlier change was not to reduce > >> the I/O between the backend and the pgstat process [...] > > > Tom, any comments on this? Your change introduced an undocumented > > regression into 8.2. I think you're on the hook for a documentation > > update at the very least, if not a revert. > > The documentation update seems the most prudent thing to me. The > problem with the prior behavior is that it guarantees that every table > in the database will eventually have a pg_stat entry, even if > stats_row_level and stats_block_level are both off. In a DB with lots > of tables that creates a significant overhead *for a feature the DBA > probably thinks is turned off*. This is not how it worked before 8.2, > and so 8.2.0's behavior is arguably a performance regression compared > to 8.1 and before. > > Now this patch went in before we realized that 8.2.x had a bug in > computing the stats-file-update delay, and it could be that after fixing > that the problem is not so pressing. But I don't particularly care for > new features that impose a performance penalty on those who aren't using > them, and that's exactly what last_vacuum/last_analyze tracking does if > we allow it to bloat the stats file in the default configuration. > > The long-term answer of course is to devise a more efficient stats > reporting scheme, but I'm not sure offhand what that would look like. > > regards, tom lane > > ---------------------------(end of broadcast)--------------------------- > TIP 7: You can help support the PostgreSQL project by donating at > > http://www.postgresql.org/about/donate -- 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 6: explain analyze is your friend
