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Posts Tagged ‘SQLServer 2008 R2’

SQL Server – Different Ways to Check Object Definition

April 14, 2014 2 comments

sp_helptext is widely used for checking object definition in SQL Server. sp_helptext can be used to check definition of various database objects like Views, Stored Procedures and User Defined Functions.

There are two other options which can be used to retrieve object definition:

OBJECT_DEFINITION( object_id ) – is a built-in function. It can also retrieve definitions of CHECK/DEFAULT constraints

sys.sql_modules – is a catalog view which returns definitions of all modules in current database

Each of these can be used as follows:


USE [SqlAndMe]
GO

sp_helptext 'MyProcedure'
GO

-- Use OBJECT_ID() function to get object id
SELECT    OBJECT_DEFINITION(OBJECT_ID('MyProcedure'))
GO

-- Use OBJECT_ID() function to get object id
SELECT    [definition]
FROM    sys.sql_modules
WHERE    object_id = OBJECT_ID('MyProcedure')
GO

OBJECT_DEFINITION(object_id) and sys.sql_modules returns results as a single-line when in “Results to Grid” (Ctrl + D) mode. Switch to “Results to Text” (Ctrl + T) for formatted output which will include line breaks.

Hope This Helps!

Vishal

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SQL Server – How to get last access/update time for a table

March 11, 2014 6 comments

Modify date and create date for a table can be retrieved from sys.tables catalog view. When any structural changes are made the modify date is updated. It can be queried as follows:


USE [SqlAndMe]
GO

SELECT    [TableName] = name,
create_date,
modify_date
FROM    sys.tables
WHERE    name = 'TransactionHistoryArchive'
GO

 

 

sys.tables only shows modify date for structural changes. If we need to check when was the tables last updated or accessed, we can use dynamic management view sys.dm_db_index_usage_stats. This DMV returns counts of different types of index operations and last time the operation was performed.

It can be used as follows:


USE [SqlAndMe]
GO

SELECT    [TableName] = OBJECT_NAME(object_id),
last_user_update, last_user_seek, last_user_scan, last_user_lookup
FROM    sys.dm_db_index_usage_stats
WHERE    database_id = DB_ID('SqlAndMe')
AND        OBJECT_NAME(object_id) = 'TransactionHistoryArchive'
GO

 

 

last_user_update – provides time of last user update

last_user_* – provides time of last scan/seek/lookup

It is important to note that sys.dm_db_index_usage_stats counters are reset when SQL Server service is restarted.

 

Hope This Helps!

Vishal

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SQL Server – SELECTing/Displaying Top N rows from a table

July 15, 2013 Leave a comment

To SELECT only top N rows from a table we can use TOP clause in SELECT statement. Using TOP clause we can also specify percentage option.

For example, both of these statements are valid:

USE SqlAndMe

GO

 

SELECT TOP 5 EmployeeId,FirstName,LastName

FROM   dbo.Table_Employees

GO

 

SELECT TOP 5 PERCENT EmployeeId,FirstName,LastName

FROM   dbo.Table_Employees

GO

EmployeeId    FirstName     LastName

1             Ken           Sánchez

2             Terri         Duffy

3             Gail          Erickson

4             Ken           Sánchez

5             Terri         Duffy

 

(5 row(s) affected)

 

 

 

EmployeeId    FirstName     LastName

1             Ken           Sánchez

 

(1 row(s) affected)

Another way to limit rows in result set is to use SET ROWCOUNT N statement. SET ROWCOUNT N stops processing the query after specified number of rows are returned.

It can be used as below:

USE SqlAndMe

GO

 

SET ROWCOUNT 5

GO

 

SELECT EmployeeId,FirstName,LastName

FROM   dbo.Table_Employees

GO

 

SET ROWCOUNT 1

GO

 

SELECT EmployeeId,FirstName,LastName

FROM   dbo.Table_Employees

GO

EmployeeId    FirstName     LastName

1             Ken           Sánchez

2             Terri         Duffy

3             Gail          Erickson

4             Ken           Sánchez

5             Terri         Duffy

 

(5 row(s) affected)

 

 

EmployeeId    FirstName     LastName

1             Ken           Sánchez

 

(1 row(s) affected)

Using SET ROWCOUNT N affects current session, to turn off this setting we need to set it to 0.

SET ROWCOUNT 0

GO

There are some differences between using SET ROWCOUNT N and TOP N [PERCENT]. You can read about these differences here: SET ROWCOUNT VS TOP in SQL Server

Hope This Helps!

Vishal

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SQL Server – How to change SQL Server ERRORLOG location

July 8, 2013 4 comments

By default SQL Server ERRORLOG is stored in "C:\Program Files\Microsoft SQL Server\InstanceFolder\MSSQL\Log" folder. The ERRORLOG location is configured as a startup parameter for SQL Server Service.

image

To change the location of ERRORLOG you need to modify the startup parameter -e.

For example, if you need to move logs to C:\Logs\ then replace the startup parameter as below:

Step 1:

Replace "-eC:\Program Files\Microsoft SQL Server\MSSQL11.SQL2012\MSSQL\Log\ERRORLOG"

to "-eC:\Logs\ERRORLOG"

Step 2:

Restart SQL Server Service to apply changes. The ERRORLOG will be created to "C:\Logs" after SQL Server is restarted.

 

To change location for SQL Server Agent Logs:

Location for SQL Server Agent Log can be changed using T-SQL or SQL Server Management Studio.

Method 1: To change SQL Server Agent Log location right click on "Error Logs" node and select "Configure"

image

Provide new location for Log file in "Error Log File" path:

image

Click on "OK" and restart SQL Server Agent to apply changes.

Method 2: To change log location using T-SQL

To change log location using T-SQL you can use below code:

USE [msdb]

GO

EXEC   msdb.dbo.sp_set_sqlagent_properties

       @errorlog_file = N'C:\Logs\SQLAGENT.OUT'

GO

Execute this code and restart SQL Server agent to apply changes.

Hope This Helps!

Vishal

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EMail me your questions -> Vishal@SqlAndMe.com
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