| From: | reedstrm(at)wallace(dot)ece(dot)rice(dot)edu (Ross J(dot) Reedstrom) |
|---|---|
| To: | pierre(at)desertmoon(dot)com |
| Cc: | pgsql-sql(at)postgreSQL(dot)org |
| Subject: | Re: [SQL] 6.4.x vs. 6.5 oddity |
| Date: | 1999-03-08 19:53:02 |
| Message-ID: | m10K65G-000LJgC@wallace.ece.rice.edu |
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| Lists: | pgsql-sql |
Pierre -
Are you sure the databases are identical? Including indicies? The only
significant difference I can see is the choice of index by the 6.5 plan
for the scan on pcat:
> V6.5
> Index Scan using pcat_dcat_id_idx on pcat c (cost=264.24 size=4465 width=4)
>
> V6.4
> Index Scan using pcat_prod_id_idx on pcat c (cost=2.00 size=4457 width=4)
Strangely enough, the estimated total cost difference is about the same ratio.
--
Ross J. Reedstrom, Ph.D., <reedstrm(at)rice(dot)edu>
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St., Houston, TX 77005
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