On Fri, Mar 16, 2001 at 12:17:41PM +0300, áÎÁÔÏÌÉÊ âÏÒÉÓÏ×ÉÞ wrote:
> Hello!
>
> There's a need to design a system (something like online forum) that will be
>storing huge amount of small messages in database.
> There must be fast access only to messages for the last 3 days (guess this means
>that main table with indexes on it must be kept small?), while other messages can be
>stored in rarely accessed archive (different table?). What's the best practice for
>implementing archiving in MySQL? In Oracle there's an ability to "switch off" part of
>the table and then move it to archive in background mode. What about MySQL?
>
Take a look at MERGE tables in the manual.
With some Perl or other scripting, you can create a table for each day which
you use to INSERT new messages. Create a MERGE table on the tables for the
last three days which you use for your SELECTs.
You can keep a separate MERGE table on the older tables. You might want to
combine some per-day tables into a larger (per week or month) table before
creating a MERGE table on them, because MySQL will have less tables to open
then, which makes it faster. You also may want to optimize the older tables
to speed things up.
Regards,
Fred.
--
Fred van Engen XO Communications B.V.
email: [EMAIL PROTECTED] Televisieweg 2
tel: +31 36 5462400 1322 AC Almere
fax: +31 36 5462424 The Netherlands
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