Query takes time on comparing non numeric data of two tables, how to optimize it?

Posted by Muhammad Kashif Nadeem on Stack Overflow See other posts from Stack Overflow or by Muhammad Kashif Nadeem
Published on 2010-04-21T14:15:51Z Indexed on 2010/04/21 17:03 UTC
Read the original article Hit count: 242

Filed under:

sql

|

tsql

|

sql-server

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sql-server-2005

I have two DBs. The 1st db has CallsRecords table and 2nd db has Contacts table, both are on SQL Server 2005.

Below is the sample of two tables.

Contact table has 1,50,000 records
CallsRecords has 75,000 records

Indexes on CallsRecords:
CallFrom
CallTo
PickUP

Indexes on Contacts:
PhoneNumber

alt text

I am using this query to find matches but it take more than 7 minutes.

SELECT *
    FROM CallsRecords r INNER JOIN Contact c ON r.CallFrom = c.PhoneNumber 
        OR r.CallTo = c.PhoneNumber OR r.PickUp = c.PhoneNumber

In Estimated execution plan inner join cost 95%

Any help to optimize it.

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