Query Optimization for reduce Execution Time

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SQL-Server-2008R2

Hi,

I am doing attendance application. In my application I have a table for store Punch in/out
I create indexing for this table for following columns (EntryDate, EmployeeID)

I need to read First Time In for all Employees so I am using following query

SQL

Select (select min( TimeIn) from tbl_TimeInOutEntry WITH(INDEX( tmescangardindx) 

where EmployeeID = E.EmployeeID and  EntryDate = '2015-03-02' group by 

EntryDate,EmployeeID) as TimeIn

from tbl_employee E where E.CompanyID = 1

But this query Execution is nearly 30 sec.

One scenario is when I have high number of records in tbl_TimeInOutEntry then this query execution is very slow.

Can you give a suggestion for optimize this query

Thanks
Siva Rm K

Attachments

Execution Plan

Timescangard detail -> TimeInTimeout Table

Posted 15-Mar-15 20:54pm

rmksiva

Updated 15-Mar-15 21:54pm

v2

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Comments

Saral S Stalin 16-Mar-15 3:03am

Can you post a screen shot of the execution plan?

An index on TimeIn, EmployeeId columns might help. But if the table is heavily inserted indexes will get fragmented soon. This will require detailed analysis and proper fill factor.

Having another table which has only the first entry for the day also might help. This table can be populated with a trigger or message broker.

rmksiva 16-Mar-15 3:16am

Thanks For your reply. i will share you execution plan in a moment

Maciej Los 16-Mar-15 4:18am

Have you tried to reduce query into single select statement (remove subquery)?

2 solutions

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Mehdi Gholam · Accepted Answer · 2015-03-15T21:26:00

Solution 1

Run the index tuning wizard and optimize your indexes : http://www.datasprings.com/resources/dnn-tutorials/artmid/535/articleid/53/sql-server-2008-profiler-and-tuning-wizard?AspxAutoDetectCookieSupport=1[^]

Posted 15-Mar-15 21:26pm

Mehdi Gholam

Comments

Maciej Los 16-Mar-15 4:24am

Good suggestion. +5!
Please, see my answer ;)

Maciej Los · Accepted Answer · 2015-03-15T22:24:00

As i mentioned in the comment to the question, i'd suggest to create query based on single select statement (reduce the count of subqueries).

If you want to get first time for the selected date and company, try this:

SQL

SELECT MIN(TI.TimeIn) AS TimeIn
FROM tbl_employee EM INNER JOIN tbl_TimeInOutEntry TI ON EM.EmployeeID = TI.EmployeeID
WHERE TI.EntryDate = '2015-03-02' AND  EM.CompanyID = 1

Note: Please, follow the solution1 by Mehdi Gholam[^] to reduce the count of indexes.