Category Archives: SQL Server

Primary Key, Unique Key Constraints – Clustered Index and Non Clustered Index

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You can use the below script to create the Primary Key on the already existing tables. Primary key enforces a uniqueness in the column and created the clustered index as default.

Primary key will not allow NULL values.

-- Adding the NON NULL constraint
ALTER TABLE [TableName]	 
ALTER COLUMN PK_ColumnName int NOT NULL

--Script to add the primary key on the existing table
ALTER TABLE [TableName]
ADD CONSTRAINT pk_ConstraintName PRIMARY KEY (PK_ColumnName)

If you want to define or create the non-clustered index on the existing table, you can use the below script. If the data in the column is unique, you can create the Unique Constraint as well.

Unique Key enforces uniqueness of the column on which they are defined. Unique Key creates a non-clustered index on the column. Unique Key allows only one NULL Value.

--script to create non-clustered Index
create index IX_ColumName on TableName(ColumnName)
--script to create Unique constraint on the existing table
ALTER TABLE TableName ADD CONSTRAINT ConstraintName UNIQUE(ColumnName)

Again Awarded as MVP for 2012-2013

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Dear Friends,

I want to share a good news with you all, I am again 3rd time awarded as MVP in SQL Server. Thanks for reading my site, I will keep posting the best article and always there to solve your queries.

Thanks,
Jugal Shah

You will see the 2012 in below award shortly -:)

Bug Fix: Property IsLocked is not available for Login ‘[sa]’. This property may not exist for this object, or may not be retrievable due to insufficient access rights

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Problem: Property IsLocked is not available for Login ‘[sa]’. This property may not exist for this object, or may not be retrievable due to insufficient access rights. (Microsoft.SqlServer.Smo)

 

Solution: You will get the above error, in case of one of the below issue.

  1. SQL Server authentication mode is Windows Only
  2. SA Account is disable
  3. SA account is locked

SQL Server authentication mode is Windows Only

You can check the SQL Server authentication mode using below query.

SELECT
CASE
SERVERPROPERTY(‘IsIntegratedSecurityOnly’)

WHEN 1 THEN
‘Windows Authentication’

WHEN 0 THEN
‘Windows and SQL Server Authentication’

END
as [Authentication Mode]

If the authentication mode Windows, you have to change the authentication mode is Mix Mode. You can change the authentication mode by right click on Server Properties -> Security tab.
This requires SQL Server Service restart.

SA Account is locked/Disable

You can execute below query to check whether SA account is locked or not. If the account is locked it will return 1 and 0 for un-locked.

SELECT
LOGINPROPERTY(‘sa’,
‘IsLocked’)

You can investigate whether SA account is locked by bad Password using below query. It will return the count of consecutive failed login attempts

SELECT
LOGINPROPERTY(‘sa’,
‘BadPasswordCount’);

GO

Right click on SA account and check the SA account properties, check the below properties of the SA login whether it is disabled or locked.

Execute the below script to unlock and enable the SA account

ALTER
LOGIN [sa] WITH
PASSWORD=N’Password’,

DEFAULT_DATABASE=[master],

DEFAULT_LANGUAGE=[us_english],

CHECK_EXPIRATION=OFF,

CHECK_POLICY=OFF

GO

ALTER
LOGIN [sa] ENABLE

GO

How to setup schedule Maintenance Plan?

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Step 1: Launch SQL Server Management Studio and In the Object Explorer expand the Management folder.

Step 2: Right click on the Maintenance Plans folder and select New Maintenance Plan.

 

Step 3: Give the meaning full name to maintenance plan.


 

Step 4: From the Toolbox drag and drop a Check Database Integrity Task, Rebuild Index Task, Update Statistics Task and place them vertically in the same order.

Step 5: Connect the tasks together by dragging the arrow from one box to the other so they are connected as: Check Database Integrity Task – Rebuild Index Task – Update Statistics Task.


Step 6 Right click on the each tasks and select the databases in maintenance plan.

Step 7 Schedule a maintenance plan to run in off business hours.