Tag Archives: Script

ORIGINAL_LOGIN() and SUSER_SNAME() functions

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ORIGINAL_LOGIN() function returns the name of the original login that connected to the instance of SQL Server and is used to identify original login in all sessions. Even though you will do the security context switch it will return the original login name.

SUSER_SNAME returns the name of user in the current security context. 

--connect SQL Using LoginDEMO account
SELECT ORIGINAL_LOGIN() Original_Login_func, SUSER_SNAME() Suser_Name_Login_Func

--Executing query using LoginTest account
execute as login = 'LoginTest'
SELECT ORIGINAL_LOGIN() Original_Login_func, SUSER_SNAME() Suser_Name_Login_Func
revert

--Again executing query be reverting the change
SELECT ORIGINAL_LOGIN() Original_Login_func, SUSER_SNAME() Suser_Name_Login_Func

Check below output image for more information. I connected SQL Server using LoginDemo account.
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Script to get the database backup history

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For the point time recovery or in case of failure it is essential that you should have the backup history of the database. You can execute the below query against the database to get the backup history.

SELECT  
   CONVERT(CHAR(100), SERVERPROPERTY('Servername')) AS Server, 
   msdb.dbo.backupset.database_name,  
   msdb.dbo.backupset.backup_start_date,  
   msdb.dbo.backupset.backup_finish_date, 
   msdb.dbo.backupset.expiration_date, 
   CASE msdb..backupset.type  
       WHEN 'D' THEN 'Database'  
       WHEN 'L' THEN 'Log'  
   END AS backup_type,  
   msdb.dbo.backupmediafamily.logical_device_name,  
   msdb.dbo.backupmediafamily.physical_device_name,   
   msdb.dbo.backupset.name AS backupset_name, 
   msdb.dbo.backupset.description 
FROM   msdb.dbo.backupmediafamily  
   INNER JOIN msdb.dbo.backupset ON msdb.dbo.backupmediafamily.media_set_id = msdb.dbo.backupset.media_set_id 
WHERE 
(CONVERT(datetime, msdb.dbo.backupset.backup_start_date, 102) >= '2013-01-08 00:04:49.000')  and (CONVERT(datetime, msdb.dbo.backupset.backup_start_date, 102) <= '2013-01-08 23:59:59')  
and  msdb.dbo.backupset.database_name = 'Mention the database name'
ORDER BY  
   msdb.dbo.backupset.backup_finish_date desc

Script to check the database Properties

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It is always good to have the idea about the database properties while doing the migration, performance tuning or configuration.

You can execute the below script to get the database property information.

select 
 sysDB.database_id,
 sysDB.Name as 'Database Name',
 syslogin.Name as 'DB Owner',
 sysDB.state_desc,
 sysDB.recovery_model_desc,
 sysDB.collation_name, 
 sysDB.user_access_desc,
 sysDB.compatibility_level, 
 sysDB.is_read_only,
 sysDB.is_auto_close_on,
 sysDB.is_auto_shrink_on,
 sysDB.is_auto_create_stats_on,
 sysDB.is_auto_update_stats_on,
 sysDB.is_fulltext_enabled,
 sysDB.is_trustworthy_on
from sys.databases sysDB
INNER JOIN sys.syslogins syslogin ON sysDB.owner_sid = syslogin.sid

Steps to Check the Host Name for a Clustered SQL Server Instance

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Problem
While troubleshooting a SQL Server cluster failover issue, it is essential to know the time needed for the cluster failover and the node name where SQL Server was running before the failover occurred. In this tip, I will show you the different options to find the failover time and node name where SQL Server was running before the failover over.

Solution
http://www.mssqltips.com/sqlservertip/2744/steps-to-check-the-host-name-for-a-clustered-sql-server-instance/

Script to determine identity table and identity column

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Script to determine the identity tables and columns in the databases.

USE <DBNAME>
--script to determine the table with the identity column
select name, OBJECTPROPERTY(id, 'TableHasIdentity') AS TableHasIdentityCol
from sysobjects
where xtype = 'U'

--script to determine the table and columne with the identity on
SELECT OBJECT_NAME(id) as TblName, name as ColName
FROM syscolumns
WHERE status = 0x80

--script to determine the table and columne with the identity on using ColumnProperty
SELECT OBJECT_NAME(id) as TblName, name as ColName
FROM syscolumns
WHERE COLUMNPROPERTY(id, name, 'IsIdentity') = 1

Setting the PowerShell Execution Policy

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Problem
Recently I moved PowerShell script files to a production environment and when executing it from the command prompt, I got this error: “File cannot be loaded because the execution of scripts is disabled on this system. Please see “get-help about_signing” for more details”. In this tip we cover what needs to be done to resolve this issue.

Solution
http://www.mssqltips.com/sqlservertip/2702/setting-the-powershell-execution-policy/