This isn't exactly what I was looking for, but it works like a charm for
both my needs and the sys admins.
Go figure everyone is happy now!
Kishore Jalleda wrote:
> The delete would definitely depend upon the size of the record set being
> deleted, anyway assuming I comprehended your situation correctly ,I
> would suggest using the Merge storage engine for your needs , and keep
> every single day of data in a seperate MyISAM table, and merge all those
> tables together into a single merge table, so when you want to do any
> maintenance on any data older than x days just alter the table and take
> that <mailxx> table out of the merge table , delete it compress it, do
> anyhting with it and then just add a other one (you could easily run a
> nightly cron job for this)
> Please look at
> Kishore Jalleda
> On 1/31/07, *sendmail-admin@stripped
> <mailto:sendmail-admin@stripped>> wrote:
> I'm trying to wrap my head around a performance problem our
> institution is
> having on our Mysql Server which hosts all of our logs from around
> Specifically our MailLogs tables.
> What I'm having a hard time with is we have metadata such as:
> CREATE TABLE mail00 (
> host varchar(32) default NULL,
> fromMTA varchar(44) default NULL,
> nextMTA varchar(44) default NULL,
> messageID varchar(44) default NULL,
> messageID2 varchar(44) default NULL,
> sender varchar(80) default NULL,
> recipient varchar(120) default NULL,
> recipient2 varchar(120) default NULL,
> date date default NULL,
> time time default NULL,
> program varchar(44) default NULL,
> ACTION varchar(44) default NULL,
> detail varchar(120) default NULL,
> msg text,
> seq int(10) unsigned NOT NULL auto_increment,
> PRIMARY KEY (seq),
> KEY host (host),
> KEY sender (sender),
> KEY recipient (recipient),
> KEY MessageID (messageID),
> KEY seq (seq),
> KEY time (time),
> KEY date (date),
> KEY ACTION (ACTION),
> KEY messageID2 (messageID2),
> KEY fromMTA (fromMTA)
> ) TYPE=MyISAM MAX_ROWS=99000000;
> We might end up storing two to three gigs of logging data per day
> from our
> mail servers.
> When we had the process setup to purge data out of this table that
> is older
> than 14 days, it would lock and take great deal of time process the
> My question is, is the structure of my table the problem or is it
> just the
> size of the data that is just going to take that long due to Disk IO?
> This isn't a table structure that I came up with, I'm just looking to
> optimize the performance of the server.
> Currently around midnight the sysadmin currently drops table 13,
> then moves
> 12 -> 13, 11 -> 12, etc... and creates a 00.
> All of this is because it takes to long to purge out one days worth
> of data
> . This will eventually cause a problem when we try to develop a
> program to
> scan the logs, it will need to scan through all 14 tables instead of
> just one.
> Is there a better way that mitigates the performance and flexibility?
> Or just a better way in general?
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