Wednesday, April 14, 2010
Query to find Dependant Objects
Select DISTINCT (OBJECT_SCHEMA_NAME(id)+'.'+ OBJECT_NAME(id)) AS [Object Name] ,(OBJECT_SCHEMA_NAME(depid)+'.'+ OBJECT_NAME(depid)) AS [Is Dependant on], OBJECTPROPERTYEX(id,'BaseType') AS [Object Type],OBJECTPROPERTYEX(depid,'BaseType') AS [Object Type of Is Dependant on] From sys.sysdepends Where OBJECTPROPERTYEX(id,'IsMSShipped')=0 -- To get only user created object
Labels:
SQL Information,
SQL Queries
Thursday, February 18, 2010
List of SQL Server instances currently installed in your network
To get a list of SQL Server instances currently installed in your network, execute either of the below commands
Exec xp_cmdshell 'SQLCMD /L'
OR
Exec xp_cmdshell 'OSQL /L'
If you want to populate a text file with the results then, open the command prompt (Go to Run, Type cmd and click ok) and type this command and hit enter
SQLCMD /L > C:\ListOfServers.txt
This command will populate the text file ListOfServers.txt with the results obtained from SQLCMD /L
Exec xp_cmdshell 'SQLCMD /L'
OR
Exec xp_cmdshell 'OSQL /L'
If you want to populate a text file with the results then, open the command prompt (Go to Run, Type cmd and click ok) and type this command and hit enter
SQLCMD /L > C:\ListOfServers.txt
This command will populate the text file ListOfServers.txt with the results obtained from SQLCMD /L
Labels:
Interview Questions,
SQL Information,
SQL Queries
Friday, February 12, 2010
Identity Column
We all know about setting Identity to a column of a table.
By setting identity to a column, we mean that the column should be populated automatically by incrementing numbers based on the seed and increment option we give.
But all these days, i was setting the identity to a column of a table which had more than 2 columns.
Just think of having a table with only one column and setting identity to that Column.
Create Table IdentityTest
(Slno int identity(1,1))
When you run this query, it will create a table named IdentityTest with the column Slno with identity on it.
What next????
The next question would be, how to insert data to this table?
Any idea, on how to insert data to this table?
Here is how you insert data to this table..
Insert Into IdentityTest Default Values
And now after reading this post, you are now familiar with inserting data to a table which has only one column and identity set on it. :)
By setting identity to a column, we mean that the column should be populated automatically by incrementing numbers based on the seed and increment option we give.
But all these days, i was setting the identity to a column of a table which had more than 2 columns.
Just think of having a table with only one column and setting identity to that Column.
Create Table IdentityTest
(Slno int identity(1,1))
When you run this query, it will create a table named IdentityTest with the column Slno with identity on it.
What next????
The next question would be, how to insert data to this table?
Any idea, on how to insert data to this table?
Here is how you insert data to this table..
Insert Into IdentityTest Default Values
And now after reading this post, you are now familiar with inserting data to a table which has only one column and identity set on it. :)
Labels:
SQL Information,
SQL Queries
Wednesday, January 27, 2010
Useful DBCC Commands
The Transact-SQL programming language provides DBCC statements that act as Database Console Commands for SQL Server.
Database Console Command statements are grouped into the following categories.
1. Maintenance
2. Miscellaneous
3. Informational
4. Validation
DBCC commands take input parameters and return values. All DBCC command parameters can accept both Unicode and DBCS literals.
Some of the Maintenance DBCC Statements are:
DBCC CLEANTABLE
DBCC INDEXDEFRAG
DBCC DBREINDEX
DBCC SHRINKDATABASE
DBCC DROPCLEANBUFFERS
DBCC FREEPROCCACHE
DBCC SHRINKFILE
DBCC UPDATEUSAGE
Some of the Miscellaneous DBCC Statements are:
DBCC dllname (FREE)
DBCC HELP
DBCC FREESESSIONCACHE
DBCC TRACEOFF
DBCC FREESYSTEMCACHE
DBCC TRACEON
Some of the Informational DBCC Statements are:
DBCC INPUTBUFFER
DBCC SHOWCONTIG
DBCC OPENTRAN
DBCC SQLPERF
DBCC OUTPUTBUFFER
DBCC TRACESTATUS
DBCC PROCCACHE
DBCC USEROPTIONS
DBCC SHOW_STATISTICS
Some of the Validation DBCC Statements are:
DBCC CHECKALLOC
DBCC CHECKFILEGROUP
DBCC CHECKCATALOG
DBCC CHECKIDENT
DBCC CHECKCONSTRAINTS
DBCC CHECKTABLE
DBCC CHECKDB
Some of the useful DBCC commands along with their syntax and examples are listed down and are available for download. Click here to download your copy now.
Reference: BOL
Reference: BOL
Labels:
Interview Questions,
SQL Information,
SQL Queries
Monday, January 25, 2010
Index Recommendations
This Query when executed gives the recomendation to your indexes whether it has to reindexed or defraged.
This query also gives the fragmentation level of your indexes.
Select db_name(DB_ID()) as DBName,SS.name as SchemaName,SO.name as TableName, SI.name as Indexname,index_type_desc as IndexType ,avg_fragmentation_in_percent as FragmentationPercentage,
(case when avg_fragmentation_in_percent between 10 and 30 then 'Defrag'
when avg_fragmentation_in_percent > 30 Then 'Reindex'
Else 'Can be Ignored Currently'
End) as Recomendation
from sys.dm_db_index_physical_stats(DB_ID(DB_NAME()), null, null, null, 'DETAILED') IPS ,
sys.indexes SI ,sys.objects SO , sys.schemas SS
where IPS.index_id=SI.index_id and IPS.object_id=SI.object_id and
SI.object_id=SO.object_id and SO.schema_id=SS.schema_id and
IPS.index_type_desc in ('NONCLUSTERED INDEX', 'CLUSTERED INDEX')
Order by Recomendation desc
This query also gives the fragmentation level of your indexes.
Select db_name(DB_ID()) as DBName,SS.name as SchemaName,SO.name as TableName, SI.name as Indexname,index_type_desc as IndexType ,avg_fragmentation_in_percent as FragmentationPercentage,
(case when avg_fragmentation_in_percent between 10 and 30 then 'Defrag'
when avg_fragmentation_in_percent > 30 Then 'Reindex'
Else 'Can be Ignored Currently'
End) as Recomendation
from sys.dm_db_index_physical_stats(DB_ID(DB_NAME()), null, null, null, 'DETAILED') IPS ,
sys.indexes SI ,sys.objects SO , sys.schemas SS
where IPS.index_id=SI.index_id and IPS.object_id=SI.object_id and
SI.object_id=SO.object_id and SO.schema_id=SS.schema_id and
IPS.index_type_desc in ('NONCLUSTERED INDEX', 'CLUSTERED INDEX')
Order by Recomendation desc
Labels:
Index Recommendations,
Indexes,
SQL Information,
SQL Queries
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