On Thu, Jan 10, 2002 at 10:25:55AM -0600, Mike Grover wrote: > > I have a database in Firebird(Interbase) that has 106 million > records at 37.4 gig. > > I imported the database into mySQL and built the same indexes. > > with a query like this: > > select * from experian.experian where latitude >= '038631928' and > latitude <= '038638092' and longitude >= '096671646' and longitude <= > '096680757'; > > Interbase takes 10 seconds to return 70 records, but mySQL takes 18 seconds > to return the same record count. > > Is there any way to speed up mySQL?
Probably, yes. > my Index is: > > ALTER TABLE EXPERIAN.EXPERIAN ADD INDEX latlong (latitude,longitude); > > Both fields are 9 chars long. > > "explain" says it is using the latlong index with a key length of 20. > > Is this the best mySQL will do? Is there a better sql statement I > can use? Is that the speed you see on every query or only the first query? How large is your key buffer? Jeremy -- Jeremy D. Zawodny, <[EMAIL PROTECTED]> Technical Yahoo - Yahoo Finance Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936 MySQL 3.23.41-max: up 7 days, processed 193,814,752 queries (288/sec. avg) --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
