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Re: Unicode combining characters

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tatsuo Ishii <t-ishii(at)sra(dot)co(dot)jp>
Cc: phede-ml(at)islande(dot)org, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Unicode combining characters
Date: 2001-10-02 16:31:40
Message-ID: 200110021631.f92GVeY12814@candle.pha.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
If no one can find a case where multibyte is slower, I think we should
enable it by default.  Comments?


> > Also, have we decided if multibyte should be the configure default now?
> 
> Not sure.
> 
> Anyway I have tested LIKE/REGEX query test using current. The query
> executed is:
> 
> explain analyze select '0000000 5089 474e...( 16475
> bytes long text containing only 0-9a-z chars) like 'aaa';
> 
> and
> 
> explain analyze select '0000000 5089 474e...( 16475
> bytes long text containing only 0-9a-z chars) ~ 'aaa';
> 
> Here is the result:
> 
> 	no MB		with MB
> LIKE	0.09 msec	0.08 msec
> REGEX	0.09 msec	0.10 msec
> 
> LIKE with MB seemed to be resonably fast, but REGEX with MB seemed a
> little bit slow. Probably this is due the wide character conversion
> overhead.
> --
> Tatsuo Ishii
> 
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-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman(at)candle(dot)pha(dot)pa(dot)us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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