MySQL query optimization

Posted on 2011-03-10
Last Modified: 2012-05-11
I want to add an index to improve performance of this  query.
From your experience, which index do you think I would benefit the most?  MyTable has several million rows.  There are maybe about 100 unique client_code, view, batch_timestamp combinations.

Please include your thoughts.

select   client_code
              , view
              , batch_timestamp
              , sum(if(file_reference = null,  1, 0)) as pending
              , count(*) as total
       from mytable
              batch_timestamp >= '20110310'
             and batch_timestamp < DATE_ADD('20110310', INTERVAL 1 DAY)
       group by client_code, view, batch_timestamp
       order by batch_timestamp ;
Question by:rudy201
  • 2
LVL 77

Expert Comment

ID: 35097233
could you post the show create table mytable

batch_timestamp, client_code shold have an index.

Accepted Solution

mayankagarwal earned 500 total points
ID: 35097399
create a Nonclustered Index on  client_code, view, batch_timestamp.

Expert Comment

ID: 35097432
create nonclustered index idx_mytable_idx1 on mytable(client_code, view, batch_timestamp)

Author Closing Comment

ID: 35175589

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Mysql Left Join Case 10 70
Very Large data in MYSQL 7 73
mysql query for sum() 3 28
Using PhpMyAdmin (or Mysql) for a find and replace operation 11 12
SQL Command Tool comes with APEX under SQL Workshop. It helps us to make changes on the database directly using a graphical user interface. This helps us writing any SQL/ PLSQL queries and execute it on the database and we can create any database ob…
When it comes to protecting Oracle Database servers and systems, there are a ton of myths out there. Here are the most common.
Video by: Steve
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

861 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question