How can I improve the response time on my query when using ibatis/spring/mysql? -


i have database 2 tables, must run simple query `

    select *      tablea,tableb      tablea.user = tableb.user      , tablea.email "%user_input%"

where user_input part of string of tablea.email has match.

the problem:

the table carry 10 million registers , taking while, cache of ibatis (as far know) used if previous query looks same. example: user_input = john_doe if second query john_doe again cache willt work, if john_do not work(that is, said, far know).

current, tablea structure this:

id int(11) not_null auto_increment email varchar(255)not_null many more fields...

i dont know if email , varchar of 255 might long , take longer time because of that, if decrease 150 characters example, response time shorter?

right query taking long... know upgrade more memory servers know if there other way improve code.

tablea , tableb have 30 fields each , related id on relational schema.

im going create index tablea.email.

ideas?

i'd recommend running execution plan query in db. that'll tell how db plans execute query, , you're looking "full table scan". i'd guess you'll see that, due like clause, , index email field won't part.

if need search substrings of email addresses might want consider granularity of how store data. example, instead of storing email addresses in single field usual split them 2 fields (or maybe more), before '@' in 1 field , domain name in another. search either component without needing like , indexes speed things significantly. example, search:

where tablea.email_username = 'user_input' or tablea.email_domain = 'user_input'

of course have concatenate 2 fields recreate email address, think ibatis let add method data object in single place instead of on app (been while since used ibatis, though, wrong).


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