我在MySQL上执行的查询需要超过51个小时才能完成

Question

The structure of the query is as follows:

SELECT DISTINCT field from table where (param1 IS NULL OR param1=CURDATE()) and (param2 IS NULL or param2=CURDATE())

There are no indexes on param1 or param2. We have a lot of data, and I want to have a cron job run a script that runs this query on a daily basis.

Suggestions? Should I somehow split this into multiple smaller queries?

EDIT: I'm expecting around 10 million results.

Answer 1

Adding this index is likely to help:

INDEX(param1, param2, field)

(It would help to know the size of the table, the schema, etc)