DBCC TRACEON / DBCC TRACEOFF/ DBCC TRACESTATUS

DBCC TRACEON / DBCC TRACEOFF/ DBCC TRACESTATUS

DBCC TRACEON - Enable trace flags.
DBCC TRACEOFF - Disable trace flags.
DBCC TRACESTATUS - Display the status of trace flags.

-->  Turn flag on for only the session level 

DBCC TRACEON (1222)

DBCC TRACEON (1205,1222)
GO

--> Turn flag on globally at server for all the sessions

DBCC TRACEON (1222, -1)
GO

-- >Turn flag off

DBCC TRACEOFF (1222);
GO

--> Show flag status

DBCC TRACESTATUS (1205,1222)

DBCC TRACESTATUS (-1)

Login failed for user 'sa' because the account is currently locked out. The system administrator can unlock it.

Error Description

Login failed for user 'sa' because the account is currently locked out. The system administrator can unlock it.

Root Cause

SQL Account only locked out, if it is enfoced to use password policies.



Resolution

You can unlock it by exeuction below command.

ALTER LOGIN sa WITH PASSWORD = 'password' UNLOCK

OR

You can do it GUI as well by unchecked locked checkbox

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Index Rebuild vs Index Reorganize. Diffrence beweent Index Rebuild and Index Reorganize

Index Rebuild	Index Reorganize
It is offline operation	It is online operation
Option is available in all SQL Server 2005 edition	Option is available in SQL Server 2005 Enterprise and Developer edition only
Index rebuilds works by re-creating the index internally again and when that has been achieved, it drops the existing index.	Index reorganize is the process of physically re-organizing the leaf nodes of the index
Index rebuild need more log space so it is advisable to change the database recovery model Simple or Bulk-logged	Reorganize swaps one page with another and thus does not require free space for this operation like rebuild does. Infect, reorganize can free up some pages as it does the reorganize in two phases – compaction and defrag. A reorganize can remove almost all of the logical fragmentation but it cannot necessarily fix extent fragmentation in which the previous and the next extents are physically contiguous.
During the index rebuild process, It will also re-compute index statistics	Reorganize on the other hand does not update the statistics
Can be done on any data type column because it is offline operation.	Another point to note is that an index (clustered or non-clustered) cannot be built online if it contains LOB data (text, ntext, varchar(max), nvarchar(max), varbinary(max), image and xml data type columns).
If you want to rebuild an index with multiple partitions in an online environment, you need to rebuild the entire index which means rebuilding all the partitions.	Regarding partitions of an index, if an index has multiple partitions, then you cannot rebuild a single partition online. You can reorganize a single index partition online
USE AdventureWorks; GO ALTER INDEX ALL ON Production.Product REBUILD GO	USE AdventureWorks; GO ALTER INDEX ALL ON Production.Product REORGANIZE
Index should be rebuild when index fragmentation is great than 40%.	Index should be reorganized when index fragmentation is between 10% to 40%
ONLINE option will not keep index available during the rebuilding.	ONLINE option will keep index available during the rebuilding.

How to check SQL Services status from management studio?

You can use the below commands to check the sql services status from manangement studio.

xp_servicecontrol querystate, MSSQLAgent
xp_servicecontrol querystate, MSSQLServer
xp_servicecontrol querystate, msdtc