Re: [PHP] Speeding up a Mysql Select
Also, probably a stupid question, but, is the `begintime` column indexed? If it isn't, no matter what you do, the whole thing will keep getting slower at an alarmingly fast pace :) Marco On Wed, 2002-10-09 at 07:14, Maurits Lawende wrote: > You should include a LIMIT to the sql-query or mysql parses the whole > database > > example: > > SELECT * FROM `support` WHERE `begintime` > 'timestamp1' AND > `begintime` < 'timestamp2' LIMIT 0,1'; > > > > John W. Holmes wrote: > > >>I'm doing a select on a database that has about 45000 records and > >> > >> > >growing > > > > > >>and its a bit SLOW. > >> > >>Its using a unix timestand to mark the beginning of a call and the end > >> > >> > >of > > > > > >>a > >>call. This is also used so I know what date the call was received. > >> > >>When I do a > >> > >>select * from support where begintime between 'timestamp1' and > >>'timestamp2'; > >> > >>It takes a while to execute... The timestamp fieldtype is > >> > >> > >varchar(10)... > > > > > >>Will I see any speed difference with a different column type? > >> > >>Any advice on how to speed this up would be greatly appreciated! :) > >> > >> > > > >It would probably help to make it an INT column, since that's what > >timestamps are and then index the column. Also, I've heard that it's > >faster to use "begintime > timestamp1 and begintime < timestamp2" > >instead of BETWEEN. It's probably minor, though, compared to the > >advantage you'll get from an indexed INT column. > > > >---John Holmes... > > > > > > > > > > > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] Speeding up a Mysql Select
You should include a LIMIT to the sql-query or mysql parses the whole database example: SELECT * FROM `support` WHERE `begintime` > 'timestamp1' AND `begintime` < 'timestamp2' LIMIT 0,1'; John W. Holmes wrote: >>I'm doing a select on a database that has about 45000 records and >> >> >growing > > >>and its a bit SLOW. >> >>Its using a unix timestand to mark the beginning of a call and the end >> >> >of > > >>a >>call. This is also used so I know what date the call was received. >> >>When I do a >> >>select * from support where begintime between 'timestamp1' and >>'timestamp2'; >> >>It takes a while to execute... The timestamp fieldtype is >> >> >varchar(10)... > > >>Will I see any speed difference with a different column type? >> >>Any advice on how to speed this up would be greatly appreciated! :) >> >> > >It would probably help to make it an INT column, since that's what >timestamps are and then index the column. Also, I've heard that it's >faster to use "begintime > timestamp1 and begintime < timestamp2" >instead of BETWEEN. It's probably minor, though, compared to the >advantage you'll get from an indexed INT column. > >---John Holmes... > > > > > -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Speeding up a Mysql Select
> I'm doing a select on a database that has about 45000 records and growing > and its a bit SLOW. > > Its using a unix timestand to mark the beginning of a call and the end of > a > call. This is also used so I know what date the call was received. > > When I do a > > select * from support where begintime between 'timestamp1' and > 'timestamp2'; > > It takes a while to execute... The timestamp fieldtype is varchar(10)... > Will I see any speed difference with a different column type? > > Any advice on how to speed this up would be greatly appreciated! :) It would probably help to make it an INT column, since that's what timestamps are and then index the column. Also, I've heard that it's faster to use "begintime > timestamp1 and begintime < timestamp2" instead of BETWEEN. It's probably minor, though, compared to the advantage you'll get from an indexed INT column. ---John Holmes... -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
[PHP] Speeding up a Mysql Select
G'day, I'm doing a select on a database that has about 45000 records and growing and its a bit SLOW. Its using a unix timestand to mark the beginning of a call and the end of a call. This is also used so I know what date the call was received. When I do a select * from support where begintime between 'timestamp1' and 'timestamp2'; It takes a while to execute... The timestamp fieldtype is varchar(10)... Will I see any speed difference with a different column type? Any advice on how to speed this up would be greatly appreciated! :) Best Regards Bob Irwin Server Admin & Web Programmer Planet Netcom -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
