From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Zeugswetter Andreas IZ5 <Andreas(dot)Zeugswetter(at)telecom(dot)at> |
Cc: | hackers(at)postgreSQL(dot)org |
Subject: | Re: [HACKERS] Really slow query on 6.4.2 |
Date: | 1999-03-25 15:23:16 |
Message-ID: | 6591.922375396@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Zeugswetter Andreas IZ5 <Andreas(dot)Zeugswetter(at)telecom(dot)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.
regards, tom lane
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