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Re: is it possible to get the optimizer to use indexes

From: Erki Kaldjärv <erki(at)webware(dot)ee>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: pg(at)fastcrypt(dot)com,Christopher Kings-Lynne <chriskl(at)familyhealth(dot)com(dot)au>,pgsql-performance(at)postgresql(dot)org
Subject: Re: is it possible to get the optimizer to use indexes
Date: 2003-12-19 16:00:25
Message-ID: 3FE32099.40901@webware.ee (view raw or flat)
Thread:
Lists: pgsql-performance
Hello,

i got indexes to work with "text_pattern_ops" for locale et_EE.

So instead of:
create index some_index_name on some_table(some_text_field);

nor

create index some_index_name on some_table(some_text_field text_ops);

try to create index as follows:
create index some_index_name on some_table(some_text_field 
text_pattern_ops);

Note that text_pattern_ops is available pg >= 7.4.

Regards,

Erki Kaldjärv
Webware OÜ
www.webware.ee

Tom Lane wrote:

>Dave Cramer <pg(at)fastcrypt(dot)com> writes:
>  
>
>>So even in a north-american locale, such as en_CA this will be a
>>problem?
>>    
>>
>
>If it's not "C" we won't try to optimize LIKE.  I know en_US does not
>work (case-insensitive, funny rules about spaces, etc) and I would
>expect en_CA has the same issues.
>
>If you're using 7.4 you have the option to create a special index
>instead of re-initdb'ing your whole database.
>
>			regards, tom lane
>
>---------------------------(end of broadcast)---------------------------
>TIP 4: Don't 'kill -9' the postmaster
>  
>

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