SQL Query Optimization

Improving the initial speed of a SQL query

I have optimized my SQL query to the maximum extent. The first time I ran the query, it took 7 seconds; the next time it took half a second. Why did this happen? How can I make the query run faster the first time around?

Sql Query in AS400

I am trying to execute a Query String but I receive following error Query exceeded the specified time limit or storage limit however my query length is normal, nevertheless i have executed larger query too. How to solve this problem.

SQL Server 2005 Query Very Slow in the first run

Hi, I have an sql query which takes 8 seconds in the first run. The next run there after takes 0.5 seconds and all consecutive runs take 0.5 seconds. Is the plan getting cached? How do i make this query run in 0.5 second in the first run itself? Please find the query below. select...

Slow SQL Query

when i run below all SQL Query simulataneously against 1500000 Rows its take 10 minutes i put the non-clustered index on the columns TATCallType ,CallTo the data type of both columns is varchar select ID,AuditMaster_ID,CallTo,CallTypeTag into Auditdata_callto from auditdata where...

Finding nth most recent action with SQL

I am trying to determine the date on which a certain number of things have happened cumulatively, eg I have a varying number of buyers each month. I want to find out on what date of that month, those buyers make their 3rd purchase. My SQL doesn't seem to support TOP or ROWCOUNT so I would...

Different Results on Insert Select than Select

I'm struggling, along with others, where I'm getting different results when doing an Insert select verses just the select. Lots of joins to get data from various tables. Only want the first record from the uniqfield table so created the tmp_uniqfieldid table with that item fielded, creation_ts ...

SQL order by Issue

Please help me write this. I need a SQL where the order by is done based on a variable passed to the query.SELECT * FROM (SELECT distinct gl.group_id, gl.group_name, gl.group_description, gl.status_code, gl.member_count, ...