| From: | Miroslav Šulc <miroslav(dot)sulc(at)startnet(dot)cz> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PFC <lists(at)boutiquenumerique(dot)com>, John Arbash Meinel <john(at)arbash-meinel(dot)com>, PGSQL mailing list <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: How to read query plan |
| Date: | 2005-03-14 16:33:44 |
| Message-ID: | 4235BCE8.1090705@startnet.cz |
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| Thread: | |
| Lists: | pgsql-hackers pgsql-performance |
Tom Lane wrote:
>Just FYI, I did a quick search-and-replace on your dump to replace
>varchar(1) by "char", which makes the column fixed-width without any
>change in the visible data. This made hardly any difference in the
>join speed though :-(. So that is looking like a dead end.
>
>
I'll try to change the data type to bool but the problem I stand in
front of is that the code expects that SELECTs return 'Y' or 'N' but
what I have found out till now is that PostgreSQL returns 't' or 'f' for
bool data. I think about some solution but they use CPU :-(
>John's idea about re-joining to the main table to pick up the bulk of
>its fields only after joining to the sub-tables might work.
>
>
I'll try that. It seems it could work.
> regards, tom lane
>
>
Miroslav
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| miroslav.sulc.vcf | text/x-vcard | 387 bytes |
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