Who is Active ? October 25, 2010Posted by furrukhbaig in DMV's, Execution Plan, Optimize, Queries running on the server, sp_who, sp_who2, sp_whoisactive, system monitoring, Tips, XML Execution Plan.
Tags: dmv, optimize, sp_who, sp_who2, sp_whoisactive, system monitoring, xml execution plan
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Adam Machanic has released new build of system monitoring stored procedure SP_WhoIsActive. Its really useful and I would like to congratulate him for his efforts.
check out the link below for his original post and to download the code.
Find out whats running on SQL Server 2005 December 13, 2007Posted by furrukhbaig in DMV's, Execution Plan, Optimize, Performance, Performance Tuning, Profiler, Queries running on the server, SQL Server 2005, SQL Server 2005 features, XML Execution Plan.
Tags: dmv, execution plan, profiler, queries running on server, whats running on sql server
Everyone wants to know whats running on the box. Specially if your job is to stabalise server you always concern what is killing the box.
A Friend of mine has published very usefull post with scripts to find out whats running on the SQL Server with their execution plan.
The same can also be managed if you run profiler and capture XML execution plan which is not always possible due to security issue and overhead of profiler itself.
SEEK is better then SCAN August 17, 2007Posted by furrukhbaig in DMV's, dm_db_index_physical_stats, dm_db_index_usage_stats, Execution Plan, Index tuning, Index usefulness, Indexes, Optimize, Performance, Performance Tuning, Query hint, SEEK vs Scan, SQL Server 2005, SQL Server 2005 features, TSQL, XML Execution Plan.
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I have been involved in performance tuning for several databases and usually come across a situation where indexes has been created but due to poorly written SQL Code those indexes are not utilized or badly used by optimizer. To find out how optimizer using your index use query below. This will provide you the frequency optimizer is uses SEEK, SCAN and LOOKUP operation on indexes.
As a rule of thumb SEEK is better then SCAN. But there are few scenarios where SCAN operator perform better then SEEK specially when large number of rows are expected to return by operation.SELECT Table_Name = OBJECT_NAME(usg.object_id), ind.name, usg.user_seeks, user_scans, user_lookups, last_user_seek, last_user_scan, last_user_lookup FROM sys.dm_db_index_usage_stats usg INNER JOIN sys.indexes ind ON usg.object_id = ind.object_id AND usg.index_id = ind.index_id WHERE — Your table list goes here OBJECT_NAME(usg.object_id) IN ( ‘Table_Name1’, ‘Table_Name2’ ) ORDER BY Table_Name