What does EXPLAIN SELECT <query> show? Have you read the chapter in the manual on optimizing queries? Do you have all the proper indices set up?
--Michael > -----Original Message----- > From: Apollo (Carmel Entertainment) [mailto:[EMAIL PROTECTED] > Sent: Wednesday, August 20, 2003 2:52 PM > To: [EMAIL PROTECTED] > Cc: [EMAIL PROTECTED] > Subject: RE: Need help optimizing query, awfully slow on only > 20000 records > > > When following query is pulled up, it takes about whole 1-2 > minutes to come up. "inquiries" table has 17000 records, > "contacts" has about 7000, "individual_contacts" has about > 16000. It has gotten worse once I upgraded to 4.0 and latest > MyODBC. Clients are separate machines (mix of Win98 and > WinXP). Those 20K records is what feeds the Access97 form, > pull down list filters out some and pulls up about 3K and > people just start typing a name and then (since there > multiple inquiries for some clients) pull down the list to > pick inquiry they want. > > > What are you defining as a huge performance hit? > > > > Is the result set 20K records, or the base tables? How big are the > > base tables? > > > > Are the client and server on the same machine? Pulling 20K records > > across the network could take some time. Formatting 20K > records into a > > pull -down list in access will also take a long time. > Anyway who reads > > a 20K list? > > > > Which parts of the process are slow? How does the query > perform from > > the mysql command line? > > > > > -----Original Message----- > > > From: Apollo (Carmel Entertainment) [mailto:[EMAIL PROTECTED] > > > Sent: 19 August 2003 17:29 > > > To: [EMAIL PROTECTED] > > > Subject: Need help optimizing query, awfully slow on only 20000 > > > records > > > > > > > > > 1.2Ghz Pentium, with 1/2Gig of ram, 4.0.14MySQL, RedHat9.0 > > > > > > I have about 20K records that result from the following > query. Front > > > end for the database is ACCESS97 and pulling up 20K > records makes a > > > huge performance hit. > > > For the form in question I am using PASSTHROUGH type query > > > (the one that just > > > passes everything straight to server without ODBC). > > > NOTE: souce_for_inquiries_form is the join table and is > > > searchable in the from > > > (it feeds a pull-down list). > > > > > > SELECT inquiries.inquiry_id, inquiries.contact_id, > > > inquiries.indiv_contact_id, inquiries.phone, inquiries.fax, > > > inquiries.agent_id, inquiries.inquiry_date, > > > inquiries.event_type, inquiries.letter_type, inquiries.event_date, > > > inquiries.event_date_general, inquiries.event_location, > > > inquiries.guests, > > > inquiries.hours, inquiries.budget, inquiries.event_description, > > > inquiries.talent_description, inquiries.past_use, > > > inquiries.referred_by, > > > inquiries.date_sent, inquiries.end_user, inquiries.event_id, > > > inquiries.notes, > > > source_for_inquiries_form.organization, > > > source_for_inquiries_form.mailing_address_1, > > > source_for_inquiries_form.mailing_address_2, > > > source_for_inquiries_form.city, > > > source_for_inquiries_form.state, source_for_inquiries_form.zip, > > > source_for_inquiries_form.contact_type, > > > individual_contacts.contact_name_first, > > > individual_contacts.contact_name_last, > > > individual_contacts.contact_prefix, > > > individual_contacts.contact_title, individual_contacts.email > > > FROM inquiries > > > LEFT JOIN individual_contacts ON inquiries.indiv_contact_id = > > > individual_contacts.indiv_contact_id > > > INNER JOIN contacts AS source_for_inquiries_form ON > > > inquiries.contact_id = > > > source_for_inquiries_form.contact_id > > > ORDER BY inquiries.inquiry_id DESC; > > > > > > ------------------------------------------------- > > > > ------------------------------------------------- > Visit CARMEL MUSIC & ENTERTAINMENT website http://carmelme.com > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: > http://lists.mysql.com/mysql?> [EMAIL PROTECTED] > > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
