SQL Tips by Namwar Rizvi

August 30, 2009

How to Query Active Directory (AD) from SQL Server

There can be a scenario where you will want to query Active Directory, directly from your stored procedure. This can be achieved by creating a linked server to your target Active Directory and then querying it through OPENQUERY functionality. Following is an example to achieve this:

Step 1: Add Linked Server for Active Directory

sp_addlinkedserver 'ADSI', 'Active Directory Service Interfaces', 'ADSDSOObject', 'adsdatasource'

Step 2: Query the Active Directory

SELECT * FROM OpenQuery
(
ADSI,   --Name of the linked server for Active directory, created in step 1
'SELECT title, displayName, sAMAccountName, givenName, telephoneNumber, facsimileTelephoneNumber, sn   --Fields you want to retreive
FROM ''LDAP://DC=TestDomain''    --Name of your Active Directory Domain
where objectClass = ''User'''         --Type of objects you want to query e.g. User, Person etc...
)

NOTE: The order in which columns will return will be exactly reversed of what you mentioned in your query. For example, in above query we have mentioned 
title, displayName…….,facsimileTelephoneNumber, sn but the resultset will return as
sn,facsimileTelephoneNumber……,displayName,title.
There is no reason of this behaviour and it is just how Active Directory OLEDB Provider works.

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April 13, 2009

SQL Server Client Tools Setup Fails due to MSXML 6

If you are trying to install SQL Server 2005 client tools and continuously getting failure message because of MSXML 6 installation which already exists on your machine then it may be due to the corrupted installation of MSXML 6 which blocks the installation of client tools. You can fix it as follows:

Go to Control Panel-> Administrative Tools->Add Remove Programs and try to remove it. If it removes smoothly then just install the Client Tools as before and you are done. 

OR

If you found that you are unable to uninstall the MSXML 6 because of some wiered error then you need a tool called Windows Install Clean up from here

Donwload it and remove the corrupt installation of MSXML 6. Once removed, you can now install the Client tools as usual.

April 5, 2009

How to create Custom Database Role and Manage its permissions

Filed under: How To,Query,SQL Server 2005,SQL Server 2008,TSQL — namwar @ 8:50 PM
Tags: , , ,

Custom database roles is the best way to manage object permission for the given database in structured way. Following script will demonstrate the steps necessary to create a new role and manage object permissions through it

--- Step 1 -------- Create Role ------------
USE [MyTestDB]
GO
CREATE ROLE [TestRole1] AUTHORIZATION [dbo]
Go

--- Step 2 -------- Assign Permissions to role  ------------
USE [MyTestDB]
GO
GRANT ALTER,EXECUTE, SELECT,INSERT,UPDATE,DELETE
ON SCHEMA ::dbo
TO TestRole1
Go

USE [MyTestDB]
GO
GRANT BACKUP DATABASE,BACKUP LOG To [TestRole1]
Go

--- Step 3 ---- Add user to our role --------------
USE [MyTestDB]
GO
EXEC sp_addrolemember N'TestRole1', N'SPUser7'
GO

-- ******  Create user *********************

--- Step 1 ---- Create Windows Login For SQL Server ------------
USE [master]
GO
CREATE LOGIN [TestDomain\SPUser7] FROM WINDOWS WITH DEFAULT_DATABASE=[MyTestDB]
GO

--- Step 2 ---- Create Database User for our database --------------
USE [MyTestDB]
GO
CREATE USER [SPUser7] FOR LOGIN [TestDomain\SPUser7]
GO

January 15, 2009

How to use more than 4GB RAM on SQL Server?

SQL Server is an highly optimized and well tuned piece of code. It try to utilise Operating System resources as optimum as possible. Due to this, most DBA think that if they will increase RAM on the server then SQL Server will automatically start using it, right? Wrong, SQL Server can only use RAM more than 4GB if and only if,

  • You are running Enterprise Editions of Windows 2003 Servers orAdvanced/Datacenter version of Windows 2000
  • You have enabled Operating System to use the extra RAM you have installed. Please check here for the details and how to do it.
  • You are not running Express or Workgroup version of SQL Server. Please check here for further details about limitations in different versions of SQL Server
  • you have enabled awe enabled option and set max server memory to the maximum memory you can allocate to SQL Server. This is applicatiable for 32 but versions of OS and not required in 64 bit version of Windows servers. Please check here for further details and how to configure the memoryfor SQL Server

January 12, 2009

TSQL Function to convert decimal to Hex, Octal or any other base

Frequently I see the questions in newsgroups about a function to convert integer value to other bases like base 2 (binary), base 8 (octal) and base 16(hex). Following TSQL function, which was orginally mentioned by Itzik Ben-Gan in his book Inside Microsoft SQL Server 2005:TSQL Querying, provides you the ability to convert a given integer into any target base. I have just updated the function with more meaningful names and added some comments to clear the logic.

Here it is:

USE [AdventureWorks]
GO;

IF EXISTS
(
SELECT * FROM sys.objects
WHERE object_id = OBJECT_ID(N'[dbo].[fn_decToBase]')
AND type in (N'FN', N'IF', N'TF', N'FS', N'FT')
)
DROP FUNCTION [dbo].[fn_decToBase]
Go
Create function [dbo].[fn_decToBase]
(
@val as BigInt,
@base as int
)
returns varchar(63)
as
Begin
/* Check if we get the valid base */
If (@val<0) OR (@base < 2) OR (@base> 36) Return Null;

/* variable to hold final answer */
Declare @answer as varchar(63);

/* Following variable contains all
possible alpha numeric letters for any base
*/
Declare @alldigits as varchar(36);
Set @alldigits='0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'

/* Set the initial value of
final answer as empty string
*/
Set @answer='';

/* Loop until your source value is greater than 0 */
While @val>0
Begin
Set @answer=Substring(@alldigits,@val % @base + 1,1) + @answer;
Set @val = @val / @base;
End

</code>

<code>/* Return the final answer */
return @answer;
End

January 8, 2009

Search all columns of all tables for a particular value

Filed under: How To,Object Search,tips,TSQL — namwar @ 7:30 PM
Tags: , , , , ,

Several times I have came across with the question that how can I search all columns of all tables in a SQL Server database for a particular value. Unfortunately, you can not perform this query directly by any already provided system table or object. 

There are some fundamental points to remember:

 

  1. You have to iterate the list of tables and for each table you have to iterate each column and perform an exist query against it. 
  2. You will need three types of queries due to the data types i.e. string, number and date and time.
I have found an excellent article here which provides a good explanation along with the necessary sql script. I would recommend every reader to read this article.

 

January 3, 2009

How to find relationship between tables

As a DBA or even as a SQL Server Programmer, you may need a quick script to find relationship between tables. I found a useful script to do that in a SQL Server newsgroup. With some minor update, here is the script which lists the name of the parent table, child table, Referred table, foreing key table and name of the foreign key constraint. I hope you will find it useful. All credit goes to original author.

Select

object_name(rkeyid) Parent_Table,

object_name(fkeyid) Child_Table,

object_name(constid) FKey_Name,

c1.name FKey_Col,

c2.name Ref_KeyCol

From

sys.sysforeignkeys s

Inner join sys.syscolumns c1

on ( s.fkeyid = c1.id And s.fkey = c1.colid )

Inner join syscolumns c2

on ( s.rkeyid = c2.id And s.rkey = c2.colid )

Order by Parent_Table,Child_Table

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