Re: [HACKERS] Really slow query on 6.4.2
От | Bruce Momjian |
---|---|
Тема | Re: [HACKERS] Really slow query on 6.4.2 |
Дата | |
Msg-id | 199903251629.LAA05120@candle.pha.pa.us обсуждение исходный текст |
Ответ на | Re: [HACKERS] Really slow query on 6.4.2 (Tom Lane <tgl@sss.pgh.pa.us>) |
Список | pgsql-hackers |
> Zeugswetter Andreas IZ5 <Andreas.Zeugswetter@telecom.at> writes: > > 5. Actually postgresql has behaved in this manner because of certain > > "bugs" in the optimizer. Recently a lot of those "bugs" have been > > identified and "fixed", thus destroying the defacto rule based > > behavior. > > That's a real good point --- I think we've already heard a couple of > complaints about the new optimizer doing "silly" things that it didn't > use to do. > > I repeat my proposal: CREATE TABLE should insert a default size (say > about 1000 tuples) into pg_class.reltuples, rather than inserting 0. > That way, the optimizer will only choose small-table-oriented plans > if the table has actually been verified to be small by vacuum. OK. Sounds good to me. -- Bruce Momjian | http://www.op.net/~candle maillist@candle.pha.pa.us | (610) 853-3000+ If your life is a hard drive, | 830 Blythe Avenue + Christ can be your backup. | Drexel Hill, Pennsylvania19026
В списке pgsql-hackers по дате отправления: