Question

I have a table:

+--------+------------------+------+-----+---------+----------------+
| Field  | Type             | Null | Key | Default | Extra          |
+--------+------------------+------+-----+---------+----------------+
| idurl  | int(11)          | NO   | PRI | NULL    | auto_increment |
| idsite | int(10) unsigned | NO   | MUL | NULL    |                |
| url    | varchar(2048)    | NO   |     | NULL    |                |
+--------+------------------+------+-----+---------+----------------+

the select statement is:

SELECT idurl,
       url
  FROM URL
 WHERE idsite = 34
   AND url REGEXP '^https\\://www\\.domain\\.com/checkout/step_one\\.php.*'

The query needs 5 seconds on a table with 1000000 rows.
Can I achieve a speedup with indexes or something else?

Answer 1

You could use the LIKE operator instead of a regular expression. But as your regular expression is simple, this may or may not improve performance.

You could split out the domain into a separate field, index it and use that in your where clause. If the URLs that you store are from many different domains then such an index could improve performance considerably.