From: Gnanakumar <gnanam@zoniac.com>
To: 'Richard Huxton' <dev@archonet.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: How to boost performance of queries containing pattern matching characters
Date: Mon, 14 Feb 2011 13:16:07 +0530
Message-ID: <004801cbcc1b$3f1d4fe0$bd57efa0$@com> (raw)
In-Reply-To: <4D58DC35.8010007@archonet.com>
References: <004601cbcc14$acfe99d0$06fbcd70$@com>
<4D58D752.2000100@archonet.com>
<004701cbcc18$c54c8980$4fe59c80$@com>
<4D58DC35.8010007@archonet.com>
> If you really need to match all those options, you can't use an index. A
> substring-matching index would need to have multiple entries per
> character per value (since it doesn't know what you will search for).
> The index-size becomes unmanageable very quickly.
> That's why I asked what you really wanted to match.
To be more specific, in fact, our current application allows to delete
email(s) with a minimum of 3 characters. There is a note/warning also given
for application Users' before deleting, explaining the implication of this
delete action (partial & case-insensitive, and it could be wide-ranging
too).
> So, I'll ask again: do you really want to match all of those options?
Yes, as explained above, I want to match all those.
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To: pgsql-performance@postgresql.org
Cc: gnanam@zoniac.com, dev@archonet.com
Subject: Re: How to boost performance of queries containing pattern matching characters
In-Reply-To: <004801cbcc1b$3f1d4fe0$bd57efa0$@com>
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