Question

I am using mysql [InnoDB engine] Index but the query response is still very slow (high response time):

I studied here Full Text Search In MySql that

we can’t be implemented on Mysql default innoDB storage engine tables.

I created a auto-suggest where user type City name then my query fetches City, Country name format.

$search = $_GET['term'];
mysql_query("CREATE INDEX index_plc ON projects(pro_loc_city)");
$result = mysql_query("SELECT CONCAT_WS(', ', p.pro_loc_city, c.country_name) 
                       as location FROM projects p
                   LEFT JOIN countries c ON c.country_id = p.country_id 
                   WHERE p.pro_loc_city LIKE '%$search%' 
                   GROUP BY p.country_id") or die('Something went wrong');
mysql_query("DROP INDEX index_plc ON projects");

In firebug the response time is approx 5 to 3 seconds.

Projects Table

----------------------------------
pro_id | pro_loc_city | country_id
----------------------------------
   1     Karachi          50
   2     Lahore           60
   3     Karachi          50
   4     Abc              70
   5     Karachi          50

Countries

-------------------------
country_id | country_name
-------------------------
   50         Pakistan
   60         A Country
   70         B Country

This is what Firebug says.

please guide me what I am doing wrong.

Answer 1

Creating an index on a large table is an expensive operation. Indexes are in most cases there to stay. Creating one, executing a query and dropping it – won’t help the speed. Try creating the index, leaving it and query again 🙂