how can i make query more faster

Question

I have one complex queries and which fetches data from database based on search keywords. I have written two query to fetch data based on keyword by joining two tables. And each table contains more than 5 millions of records. But the problem is, this query takes 5-7 seconds to run so the page take more time to laod. The queries are:

SELECT DISTINCT( `general_info`.`company_name` ), 
               general_info.* 
FROM   general_info 
       INNER JOIN `financial_info` 
               ON `financial_info`.`reg_code` = `general_info`.`reg_code` 
WHERE  ( `financial_info`.`type_of_activity` LIKE '%siveco%' 
          OR `general_info`.`company_name` LIKE '%siveco%' 
          OR `general_info`.`reg_code` LIKE '%siveco%' ) 

Answer 1

The parentheses around distinct don't make a difference. distinct is not a function. So your query is equivalent to:

SELECT gi.* 
FROM   general_info gi INNER JOIN
      `financial_info` gi
       ON fi.`reg_code` = gi.`reg_code` 
WHERE fi.`type_of_activity` LIKE '%siveco%' OR
      gi.`company_name` LIKE '%siveco%' OR
      gi.`reg_code` LIKE '%siveco%';

For the join , you should have indexes on general_info(reg_code) and financial_info(reg_code) . You may already have these indexes.

The real problem is probably the where clause. Because you are using wildcards at the beginning of the pattern, you cannot optimize this with a regular index. You may be able to do what you want using full text search, along with the matches clause. The documentation for such an index is here . This will work particularly well if you are looking for complete words in the various names.