如何优化这个简单的SQL查询？

Question

I have a very simple and straightforward SQL query that is taking over 100 seconds to complete. There are about 10,000 rows of data in the table being searched. What can I do to speed up this query?

The table structure that the query is searching is..

id (int 10)
forumId (varchar 255)
username (varchar 255)
email (varchar 255)
timestamp (int 10)

For example the query is..

SELECT * FROM users WHERE forumId = 'minecraft' AND username = 'test'

It is taking over 100 seconds

Answer 1

add compound index,

ALTER TABLE ADD INDEX(forumId, username)

also lower your string length to about 75 :)