Micah Stevens ([EMAIL PROTECTED]) wrote: > >Just a note, on your query comments, although I'm not arguing with your >basic point, it's always been my understanding that SELECT statements that >use '*' instead of stating field names are slower. If you don't specify the >field names the database has to spend time figuring out what they are, but >if you name them all it has to do it error if it can't find the name. > >In practice I've noticed it to be only marginally faster to explicitly name >the fields rather than use the '*' wildcard. Not really noticeable unless >you're doing tons of SELECT statements.
Either or not use wildcards it should be faster to get the header in one query instead of five, I think. >Back to the point of your mail though: Is it faster to make one big >conglomerate SQL statement that takes the database longer to parse? If it's >the difference between one connection, and two, I doubt it, but the more >you slim things down the better. That's for sure. If the message is stored directly in "messages" instead of "messages" + "messageblks" the query look like: "SELECT * FROM messages WHERE message_idnr = <msg_nbr> AND status<2 AND unique_id ! = '' AND mailbox_idnr = <mbox>" ...or for exemple: "SELECT from,to,subject,seen_flag FROM messages WHERE message_idnr = <msg_nbr> AND status<2 AND unique_id != '' AND mailbox_idnr = <mbox>" My second question: why to use the extra table messageblks to store the message ? Thanks for spend your time to reply to my questions. Sam. >At 03:26 AM 9/24/2002 +0200, you wrote: >>Hi, >> >>We have noticed that and make some tests with several Webmail and mail >>clients as Netscape, Outlook, vs courier-imap with the same mail >>clients. >> >>First conclusions the PHPs' webmails are very slow except Squirrelmail >>because it use its own imap libraries instead of PHP-IMAP. But it's true >>Courier-IMAP it's much faster than dbmail-imap, we have add the mysql >>indexes as explained in this list, tuned the mysql config and got some >>improvements but never too fast as courier-imap. >> >>Then we have put the trace_level to 5 and make the same tests and we >>have noticed that to get each mail header dbmail-imap need 4 or 5 >>queries and in my opinion I think that it should be possible to get the >>same think with only one or two: >> >>By use a "SELECT * FROM messages" instead "SELECT field-1, field-2..." >>and/or change the table structure to put the mail header on "messages" >>whith the from:, to:, subject:, field and perhaps the body too, or just >>the body on messageblks. >> >>DBmail is the right way to make an isp mail solution with a lot of >>capabilities as CRM, etc, but we have to improve its speed and discuss >>to find the best way to do. >> -- Sam Przyswa - Chef de projet Arial Concept - Intégrateur Internet 36, rue de Turin - 75008 - Paris Tel: 01 40 54 86 04 - Fax: 01 40 54 83 01 Web: http://www.arial-concept.com - Email: [EMAIL PROTECTED]
