Category Archives: SQL Server 2008

Script to find out Orphaned AD/Windows Logins

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It is easy to find out the orphaned SQL logins by comparing the SID of SQL Login and User, but what in case of windows login.

Take an example if windows login is dropped and it is still exists in SQL Server. You can find out all the delete windows login which is orphaned in SQL Server, using below procedure.

Sp_validatelogins
Reports information about Windows users and groups that are mapped to SQL Server principals but no longer exist in the Windows environment.

CREATE TABLE #dropped_windows_logins
  (
     [sid]  VARBINARY(85),
     [name] SYSNAME
  )

INSERT #dropped_windows_logins
EXEC sys.Sp_validatelogins

SELECT *
FROM   #dropped_windows_logins

DROP TABLE #dropped_windows_logins

Script to create Folder/Directory using SSMS

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One of my blog reader requested that, how to create the directory using Script/SSMS. Here is the answer.

— Below query will list out the directories on C drive
EXEC MASTER.sys.Xp_dirtree ‘C:\JugalA’

— Below query will create the folder JugalA on C drive
EXEC MASTER.dbo.Xp_create_subdir ‘C:\JugalA’

— Below query will create the folder JugalB on C:\JugalA drive
EXEC MASTER.dbo.Xp_create_subdir ‘C:\JugalA\JugalB’

Query to Check the SQL Server Restart time

You can simply run one of the below query to check the SQL Server last restart time.


SELECT Dateadd(s, ( ( -1 ) * ( osd.[ms_ticks] / 1000 ) ), Getdate()) AS serverrestartdatetime,
       osd.sqlserver_start_time
FROM   sys.[dm_os_sys_info] osd;  

OR

SELECT name,
       crdate
FROM   sys.sysdatabases
WHERE  name = 'tempdb'

Useful Links for Microsoft SQL Server Certification

http://www.microsoft.com/learning/en/us/certification/cert-sql-server.aspx

http://www.microsoft.com/learning/en/us/exam.aspx?ID=70-432

http://www.measureup.com/70-432-TS-Microsoft-SQL-Server-2008-Implementation-and-Maintenance–P586.aspx

https://mcp.microsoft.com/mcp

Troubleshooting CPU bottleneck

sys.dm_os_schedulers is a useful DMV to find out the CPU pressure. It returns one row per scheduler in SQL Server where each scheduler is mapped to an individual processor.

We can use this DMV to monitor the condition of a scheduler or to identify runaway tasks. It will help us to identify if there is any CPU bottleneck in the SQL Server machine.

We have to check for “runnable_tasks_count” column value which indicates the count of workers that have tasks assigned to them that are just waiting for their share of time on the scheduler (logical CPU). The value of runnable_tasks_count should be as low as possible.

Permission
Requires VIEW SERVER STATE permission on the server

SELECT scheduler_id,
status,
cpu_id,
is_online,
current_tasks_count,
runnable_tasks_count,
current_workers_count,
active_workers_count,
work_queue_count,
pending_disk_io_count,
load_factor
FROM sys.dm_os_schedulers
GO

If you find the the avg(runnable_tasks_count) greater then 0 that means system is waiting for CPU time. If Pending_disk_io_count is greater then 0, that means system is bound by IO you need to get disks to perform better.