| From: | ITAGAKI Takahiro <itagaki(dot)takahiro(at)oss(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com> |
| Cc: | "Andrew Dunstan" <andrew(at)dunslane(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: like/ilike improvements |
| Date: | 2007-09-21 09:41:38 |
| Message-ID: | 20070921180728.68E4.ITAGAKI.TAKAHIRO@oss.ntt.co.jp |
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| Lists: | pgsql-hackers pgsql-patches |
"Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com> wrote:
> It's better but still slower than 8.2.
It probablly comes from 'var-varlena' feature in 8.3. Now we store
text fields in a compact format on disks and extract them on access.
It consumes some CPU cycles. If all of data are in buffer cache
and the encoding of database is single-byte encodings, the performance
of LIKE in 8.3 was 10-20% slower than 8.2 on my tests.
Regards,
---
ITAGAKI Takahiro
NTT Open Source Software Center
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