Wednesday, December 10, 2008

Clear Transaction Log in SQL Server 2005 database

  1. Backup DB
  2. Detach DB
  3. Rename Log file
  4. Attach DB
  5. New log file will be recreated
  6. Delete Renamed Log file.

Above just is 1 of the way to clear the transaction log file

Monday, December 1, 2008

SQL Combine 2 Different Table

This SQL is use to combine 2 different table together for other purpose.
SELECT ISNULL(a.Col1,b.Cola) , ISNULL(a.Col2,b.Colb)
FROM Table1 a
FULL JOIN Table2 b
ON a.Col1 = b.Cola

Here is 2 Different Table,
Table Name : Salary

Table Name: Flight
Kuala Lumpur265

Below Sql is use to combine above 2 Tables Become below 1 Table
SELECT ISNULL(a.Name,b.FlightTicket) AS Col1, ISNULL(a.Salary,b.Price) AS Col2 FROM Salary a
FULL JOIN Flight b ON a.Name = b.FlightTicket

Kuala Lumpur265

Thursday, November 27, 2008


DBCC FREEPROCCACHE to clear the plan cache carefully. Freeing the plan cache can causes, for example, a stored procedure to be recompiled instead of reused from the cache. This can cause a sudden, temporary decrease in query performance.

DBCC SQLPERF(logspace)

DBCC SQLPERF(logspace) is an absolutely functional command if you are only interested in consumption of your database log files. It provides the cumulative size for each log file for each database on the SQL Server instance as well as the amount of space consumed (as a percentage of total log file size). A drawback is the fact that the results are an aggregate for the database.

logspace can be 1 of the value below:
UMSStats - SQL thread management
WaitStats - resources, wait types
IOStats - outstanding reads & writes (note: always zeros)
RAStats - read ahead activity (note: always returns zeros)
Threads - I/O / CPU / memory usage per thread
SpinLockStats - statistics on spinlocks
UMSSpinStats - statistics on UMS
NetStats - ODS statistics
LRUStats - LRU-MRU chain statistics (Note: free page scan always zero)


This DBCC command provides us the data files for the current database that you select. DBCC SHOWFILESTATS or DBCC SHOWFILESTATS WITH NO_INFOMSGS is the command to display the current database File Name, Database Name, Total Extend, Used Extent, Field ID and File Group.

Friday, November 21, 2008

Get the ID of a Newly Inserted Row Using SCOPE_IDENTITY()

SCOPE_IDENTITY() command will give you the last identity value that was generated in the current scope.

@@Identity will return the last identity value that was generated in the current session but in any scope.

If you database got trigger to insert a new row, @@Identity will give you the id that generated by trigger instead of ID of the last row you inserted.

In order to get the ID of the row that you inserted, which is just what SCOPE_IDENTITY() will give you.

Below is the SQL to get the last inserted ID in the current scope that need to execute together with the commands.

string sqlString = "INSERT INTO Table(Col1, Col2) VALUES (@Col1, @Col2); SELECT SCOPE_IDENTITY () As NewID";
SqlCommand objCmd = new SqlCommand(sqlString, MyConnection);
objCmd.Parameters.Add(new SqlParameter("@Col1", Col1Value));
objCmd.Parameters.Add(new SqlParameter("@Col2", Col2Value);

SqlDataReader dataReader = objCmd.ExecuteReader();

if (dataReader.HasRows)
newRowID = Convert.ToInt32(dataReader["NewID"]);


Friday, November 14, 2008

SQL Update Multiple Columns

Below Sql use to update multiple column for a table in 1 shot


SET (Col1, Col2, Col3, Col4) =
(SELECT Col1a, Col2a, Col3a, Col4a FROM Table2 WHERE Col5a=Table1.Col5)
WHERE Col5 IN (SELECT Col5a FROM Table2 )


Identity column not getting sequential values

Identity values are not sequential. Even if you do not delete rows, you can end up with missing identity values. If a transaction inserts a new record to the table and ROLLS BACK, you can end up with a missing identity value.

Tuesday, October 7, 2008

Connect to Sql Server 2005 Express for Window SharePoint Service

If you wanna to connect to the sql server 2005 express after u install window share point to your window server 2003 and when u try to connect to the ServerName\Microsoft##SSEE, it return you error.
Actualy you can't connect to WSS database remotely because network connectivity is disabled by default. ( or without SQL Server Agent Services not installed)

You can use below as ur server name like the image below, it will let you to connect to your share point database

Thursday, August 21, 2008

The Hibernate Query Language - HQL

NHibernate is equipped with an extremely powerful query language that looks very much like SQL. Hibernate Query Language (HQL) is fully object-oriented, understanding notions like inheritence, polymorphism and association.

The simplest possible Hibernate query is of the form:
- "From Employee" - (similar to SQL "Select * From Employeetbl"
* Employee is a mapping class
if you map the table Employeetbl to a mapping class, so you can use the HQL to select from the mapping file.

Example of Mapping Class for NHibernate
<class table="Employeetbl" name="Employee" lazy="false">
<id type="string" column="Employeeid" name="Employeeid">
<generator class="increment">
<property type="string" column="EmployeeName" name="EmployeeName"></property>

Saturday, August 9, 2008


NHibernate is a port of Hibernate Core for Java to the .NET Framework. It handles persisting plain .NET objects to and from an underlying relational database. Given an XML description of your entities and relationships, NHibernate automatically generates SQL for loading and storing the objects. Optionally, you can describe your mapping metadata with attributes in your source code.

NHibernate uses the following ways to retrieve objects from the database:
  • Hibernate Query Language (HQL)
  • Query By Criteria (QBC) and Query BY Example (QBE) using Criteria API
  • Native SQL queries

NHibernate can work on these Database

  • Microsoft SQL Server 2005/2000
  • Oracle
  • Microsoft Access
  • Firebird
  • PostgreSQL
  • DB2 UDB
  • MySQL
  • SQLite


Saturday, July 26, 2008

SQL Server Express Edition Comparison Table

Express Edition Products for SQL Server Compared
FeatureSQL Server 2005 Express EditionSQL Server 2005 Express Edition with Advanced ServicesSQL Server 2005 Express Edition Toolkit

Database Engine



Client Components




Full Text Search


Reporting Services


Management Studio Express



Business Intelligence Developer Studio


Comparation between the SQL Server Database Between:

1. SQL Server 2005 Express Edition

2. SQL Server 2005 Express Edition with Advanced Services

3. SQL Server 2005 Express Edition Toolkit

SQL Server 2005 Management Studio Express

Free to download, free to redistribute, free to embed, and easy for new developers to use immediately, a simple but powerful development environment for building data-driven applications.

The advanced query optimization engine of SQL Server 2005 delivers fast performance with full-text search. Load databases easily through the XCopy feature. Native XML support ensures that your Web environment can easily interoperate with other applications through Web services.

SQL Server 2005 Reporting Services provides a complete, server-based platform for creating, managing, and delivering traditional and interactive reports. Easily create sophisticated reports with tables, charts, and graphics, and then embed them in applications.

Configure SQL Server Express to dynamically tune database parameters to respond to changing usage characteristics. SQL Server Express delivers user updates directly using Microsoft Update, easily plugs in to most enterprise management environments, and supports either silent installs or GUI-based setup and installations.

SQL Server Express Edition

Friday, July 25, 2008

List of DBCC in SQL SERVER 2005

DBCC stands for database consistency checker. We use these commands to check the consistency of the databases.
Example, maintenance, validation task and status checks.

DBCC CHECKALLOC - Check consistency of disk allocation.
DBCC CHECKCATALOG - Check catalog consistency
DBCC CHECKCONSTRAINTS - Check integrity of table constraints.
DBCC CHECKDB - Check allocation, and integrity of all objects.
DBCC CHECKFILEGROUP - Check all tables and indexed views in a filegroup.
DBCC CHECKIDENT - Check identity value for a table.
DBCC CHECKTABLE - Check integrity of a table or indexed view.
DBCC CLEANTABLE - Reclaim space from dropped variable-length columns.
DBCC dllname - Unload a DLL from memory.
DBCC DROPCLEANBUFFERS - Remove all clean buffers from the buffer pool.
DBCC HELP - Help for DBCC commands.
DBCC INPUTBUFFER - Display last statement sent from a client to a database instance.
DBCC OPENTRAN - Display information about recent transactions.
DBCC OUTPUTBUFFER - Display last statement sent from a client to a database instance.
DBCC PROCCACHE - Display information about the procedure cache
DBCC SHOW_STATISTICS - Display the current distribution statistics
DBCC SHRINKDATABASE - Shrink the size of the database data and log files.
DBCC SHRINKFILE - Shrink or empty a database data or log file.
DBCC SQLPERF - Display transaction-log space statistics. Reset wait and latch statistics.
DBCC TRACE - Enable or Disable trace flags
DBCC UPDATEUSAGE - Report and correct page and row count inaccuracies in catalog views
DBCC USEROPTIONS - Return the SET options currently active
DBCC deprecated commands

Thursday, July 24, 2008

New Feature in MySQL 6.0

1. The new Falcon transactional storage engine.

2. Support for additional Unicode character sets: utf16, utf32, and 4-byte utf8. These character sets support supplementary Unicode characters; that is, characters outside the Basic Multilingual Plane (BMP).

3. BACKUP DATABASE and RESTORE statements for backup and restore operations.

4. Optimizer enhancements for faster subqueries and joins, including batched index access of table rows for sequences of disjoint ranges by the MyISAM and InnoDB storage engines.

5.The syntax for the LOCK TABLES statement has been extended to support transactional table locks that do not commit transactions automatically. Following LOCK TABLES ... IN SHARE MODE or LOCK TABLES ... IN EXCLUSIVE MODE, you can access tables not mentioned in the LOCK TABLES statement. You can also issue LOCK TABLES statements that acquire transactional locks many times in succession, adding additional tables to the locked set, and without unlocking any tables that were locked previously. When using LOCK TABLES with IN SHARE MODE or IN EXCLUSIVE MODE, tables are not unlocked until the transaction ends.
Transactional locks acquired with LOCK TABLES are released when the transaction ends, either explicitly with COMMIT or ROLLBACK, or implicitly due to a statement that causes implicit commit or because the connection ends.

6. Support for extended comments for tables, columns, and indexes.

More details, visit here


SQLyog GUI is the most powerful MySQL manager and admin tool, combining the features of MySQL Query Browser, Administrator, phpMyAdmin and various other MySQL Front Ends and MySQL clients in a single intuitive interface.

Wednesday, July 9, 2008

LINQ to SQL in C#

This article provides an introduction to employing LINQ to SQL within a Windows Forms application.
Article will address the incorporation of LINQ to SQL into a win forms project, how to use LINQ to SQL to select, insert, update, and delete data, and how to use LINQ to SQL to execute stored procedures.

The article shows some simple examples of LINQ to SQL; from it you can see how easy it is to query against single and related tables and to write filtered queries, execute stored procedures, perform aggregation, and how to insert, update, and delete records from the database.

DataClasses1DataContext dc = new DataClasses1DataContext();
var q =
from a in dc.GetTable()
where a.CustomerID.StartsWith("A")
orderby a.OrderDate ascending
select a;
dataGridView1.DataSource = q;

click here for full article

LINQ tutorials convert a Linq Query resultset to DataTable object

This LINQ tutorials convert a Linq Query resultset to DataTable object.
The tutorials attached with the source code

full article, click here

LINQ Begginer Tutorials

In this tutorial, we looked at the current state of today's data access story. Then we looked at how LINQ and the new language features in C# 3.0 solve these issues by providing us with a consistent set of Standard Query Operators that we can use to query any collection that implements IEnumerable. In this installment, we only focused on in-memory collections of data in order to avoid the confusion that most people have when mixing LINQ with DLinq and XLinq, but rest assured these will be covered in the future installments of this article. Furthermore, because LINQ is just a set of methods that adhere to the naming conventions for the Standard Query Operators, anybody can implement their own LINQ based collections for accessing any other type of data.

More Details, please visit the link

Thursday, June 26, 2008

Relational database management system (RDBMS)

A Relational database management system (RDBMS) is a database management system (DBMS) that is based on the relational model as introduced by E. F. Codd. Most popular commercial and open source databases currently in use are based on the relational model.

A short definition of an RDBMS may be a DBMS in which data is stored in the form of tables and the relationship among the data is also stored in the form of tables.

Monday, June 23, 2008

Not be enough virtual memory - SQL Server

For each updated database, SQL Server allocates at least one 64-KB block for use in formatting log records before they are written to disk. This allocation occurs when the first log record is generated for the database, such as during an INSERT, UPDATE, or DELETE statement. Depending on the activity and the size of the generated log records, subsequent modifications might trigger the allocation of additional 64-KB allocations. SQL Server 7.0 will allocate no more than three 54-KB blocks. In SQL Server 2000, the upper number of allocations for each database is a function of the number of processors that SQL Server is configured to use.

Use the -g startup parameter to leave additional, unreserved virtual memory available for these database allocations. The -g parameter is documented in the Readme.txt of the SQL Server 7.0 service pack, and in SQL Server 2000 Books Online. The "More Information" section in this article includes the settings that Microsoft recommends you use to determine the appropriate value for this setting.

Sql Server 2005 - Twelve Tips For Optimizing Query Performance

1. Turn on the execution plan, and statistics
2. Use Clustered Indexes
3. Use Indexed Views
4. Use Covering Indexes
5. Keep your clustered index small.
6. Avoid cursors
7. Archive old data
8. Partition your data correctly
9. Remove user-defined inline scalar functions
10. Use APPLY
11. Use computed columns
12. Use the correct transaction isolation level

Original Article

Tuesday, June 10, 2008

LINQ - .NET Language Integrated Query

LINQ to SQL is an O/RM (object relational mapping) implementation that ships in the .NET Framework "Orcas" release, and which allows you to model a relational database using .NET classes. You can then query the database using LINQ, as well as update/insert/delete data from it.

LINQ to SQL fully supports transactions, views, and stored procedures. It also provides an easy way to integrate data validation and business logic rules into your data model.

Developers can use LINQ with any data source. They can express efficient query behavior in their programming language of choice, optionally transform/shape data query results into whatever format they want, and then easily manipulate the results. LINQ-enabled languages can provide full type-safety and compile-time checking of query expressions, and development tools can provide full intellisense, debugging, and rich refactoring support when writing LINQ code.

LINQ supports a very rich extensibility model that facilitates the creation of very efficient domain-specific operators for data sources. The "Orcas" version of the .NET Framework ships with built-in libraries that enable LINQ support against Objects, XML, and Databases.

For More details about the LINQ :
Part 1: Introduction to LINQ to SQL
Part 2: Defining our Data Model Classes
Part 3: Querying our Database
Part 4: Updating our Database
Part 5: Binding UI using the ASP:LinqDataSource Control
Part 6: Retrieving Data Using Stored Procedures
Part 7: Updating our Database using Stored Procedures
Part 8: Executing Custom SQL Expressions
Part 9: LINQ to SQL (Part 9 - Using a Custom LINQ Expression with the control)

Sunday, April 27, 2008


SQL IDENTITY_INSERT is allow values to be inserted into the identity column of a table.
Identity column creates a numeric sequence value for you automatic.

It only alow one table in a session can have the IDENTITY_INSERT property set to ON.
If you need to change the table, you need to set the existing table IDENTITY_INSERT back to OFF.


If the value inserted is larger than the current identity value for the table, SQL Server automatically uses the new inserted value as the current identity value.


Tuesday, April 15, 2008

SQL Get Rows Number

Below SQL Statement return rows number for each row in a partition.

select R1.CategoryName,
rank = (select count(distinct R2.CategoryName) from categories R2 where R1.CategoryName <= R2.CategoryName) from categories R1 Order by Rank

Below is the result after use the row number sql statement:

Friday, March 28, 2008


When you perform any data modification operations (INSERT, UPDATE, or DELETE statements) table fragmentation can occur. When changes are made to the data that affect the index, index fragmentation can occur and the information in the index can get scattered in the database. Fragmented data can cause SQL Server to perform unnecessary data reads, so a queries performance against a heavy fragmented table can be very poor.

Rebuilding an index is a more efficient way to reduce fragmentation in comparison with dropping and re-creating an index, this is because rebuilding an index is done by one statement.

The DBCC DBREINDEX statement cannot automatically rebuild all of the indexes on all the tables in a database it can only work on one table at a time. You can write your own script to rebuild all the indexes on all the tables in a database

TableName - Is the name of the table in your DataBase.
Index_name - Is the name of the index to rebuild. (refer to image below)
Fillfactor - Is the percentage of space on each index page to be used for storing data when the index is created or rebuilt. Default is 100.

DBCC DBREINDEX ('TableName','Index_Name',fillfactor)

DBCC DBREINDEX ('Categories')
DBCC DBREINDEX ('Categories','Categoryname',80)

- It Can improve your database perfomance.

Wednesday, March 19, 2008

WITH RECOMPILE - Re Compile Execution Query Plan

WITH RECOMPILE is specified SQL Server does not cache a plan for this stored procedure; the stored procedure is recompiled each time it is executed. Use the WITH RECOMPILE option when stored procedures take parameters whose values differ widely between executions of the stored procedure, resulting in different execution plans to be created each time. Ideally, you should not use this option because by using this option, you lose most of the advantages you get by substituting SQL queries with the stored procedures. However, you can use this option during early development stages of the project where database structure is still evolving and stored procedures should be recompiled as a result of these changes.

Below is the simple example for using With Recompile in creating STORE PROCEDURE
Select Column1, column2 from Table

Except the above method, you also can using with Recompile when u Execute the Store procedure in Query Analyzer.

Below is the example for using With Recompile in Query analyzer
EXEC sp_MyTable1 'Parameter1', 'Parameter2' WITH RECOMPILE

This tells SQL Server to throw away the existing query plan or do not cache the previous execution query plan and build another one query plan but only this once.

Thursday, February 28, 2008

sp_changedbowner - SQL Change DB Owner

- Changes the owner of the current database.

After sp_changedbowner is executed, the new owner is known as the dbo user inside the database. The dbo has implied permissions to perform all activities in the database.

The owner of the master, model, or tempdb system databases cannot be changed.
To display a list of the valid login values, execute the sp_helplogins stored procedure.
Executing sp_changedbowner with only the login parameter changes database ownership to login and maps the aliases of users who were previously aliased to dbo to the new database owner.

Only members of the sysadmin fixed server role can execute sp_changedbowner.

This example makes the user Emil the owner of the current database and maps
existing aliases to the old database owner to Emil.

EXEC sp_changedbowner 'Emil'

Wednesday, February 27, 2008

Overview of DTS Package

DTS Introduction

Many organizations need to centralize data to improve corporate decision-making. However, their data may be stored in a variety of formats and in different locations. Data Transformation Services (DTS) addresses this vital business need by providing a set of tools that lets you extract, transform, and consolidate data from disparate sources into single or multiple destinations supported by DTS connectivity. By using DTS tools to graphically build DTS packages or by programming a package with the DTS object model, you can create custom data movement solutions tailored to the specialized business needs of your organization.

DTS Basics

Data Transformation Services (DTS) provides a set of tools that lets you extract, transform, and consolidate data from disparate sources into single or multiple destinations. You create a DTS solution as one or more packages. Each package may contain an organized set of tasks that define work to be performed, transformations on data and objects, workflow constraints that define task execution, and connections to data sources and destinations. DTS packages also provide services, such as logging package execution details, controlling transactions, and handling global variables.

DTS supplies a number of tasks that are part of the DTS object model that can be accessed graphically, through DTS Designer, or programmatically. These tasks, which can be configured individually, cover a wide variety of data copying, data transformation, and notification situations. For example:

Importing and exporting data
DTS can import data from a text file or an OLE DB data source (for example, a Microsoft Access 2000 database) into SQL Server. Alternatively, data can be exported from SQL Server to an OLE DB data destination (for example, a Microsoft Excel 2000 spreadsheet). DTS also allows high-speed data loading from text files into SQL Server tables.
Transforming data
DTS Designer includes a Transform Data task that allows you to select data from a data source connection, map the columns of data to a set of transformations, and send the transformed data to a destination connection. DTS Designer also includes a Data Driven Query task that allows you to map data to parameterized queries.
Copying database objects
With DTS, you can transfer indexes, views, logins, stored procedures, triggers, rules, defaults, constraints, and user-defined data types in addition to the data. In addition, you can generate the scripts to copy the database objects.
Sending and receiving messages to and from other users and packages
DTS includes a Send Mail task that allows you to send an e-mail if a package step succeeds or fails. DTS also includes an Execute Package task that allows one package to run another as a package step, and a Message Queue task that allows you to use Message Queuing to send and receive messages between packages.
Executing a set of Transact-SQL statements or Microsoft ActiveX scripts against a data source
The Execute SQL and ActiveX Script tasks allow you to write your own SQL statements and scripting code and execute them as a step in a package workflow.

Thursday, February 21, 2008

SQL Server 2008 New DATETIME DataTypes

The DATETIME function’s major change in SQL Server 2008 is the four DATETIME data types introduced. They are DATE, TIME, DATETIMEOFFSET and DATETIME2. IN addition to these newly introduced data types, there are new DATETIME functions all well.

TIME Datatype
SET @dt = getdate()


The range for the DATE datatype is from 00:00:00.0000000 through 23:59:59.9999999..

DECLARE @dt7 datetime2(7)
SET @dt7 = Getdate()
2007-10-28 22:11:19.7030000

for above example, (7) is the Fraction

Fraction Output
0 2007-10-28 22:11:20
1 2007-10-28 22:11:19.7
2 2007-10-28 22:11:19.70
3 2007-10-28 22:11:19.703
4 2007-10-28 22:11:19.7030
5 2007-10-28 22:11:19.70300
6 2007-10-28 22:11:19.703000
7 2007-10-28 22:11:19.7030000

Monday, February 4, 2008

Maps an existing database user to a SQL Server login using SP_CHANGE_USERS_LOGIN

Automatically mapping a user to a login, creating a new login if it is required
The following example shows how to use Auto_Fix to map an existing user to a login of the same name, or to create the SQL Server login Mary that has the password 123456 if the login Emil does not exist.

EXEC SP_Change_Users_Login 'Auto_Fix','Emil',Null,'123456'

- it is useful when u restore a existing DB to new Server. After u restore the DB, user in DB cannot link to SQL Server Login. So, you need to use the sql command instead of SQL Server GUI to update user Access Right.

Auto_FixLinks a user entry in the sys.database_principals system catalog view in the current database to a SQL Server login of the same name. If a login with the same name does not exist, one will be created. Examine the result from the Auto_Fix statement to confirm that the correct link is in fact made. Avoid using Auto_Fix in security-sensitive situations.
When you use Auto_Fix, you must specify user and password if the login does not already exist, otherwise you must specify user but password will be ignored. login must be NULL. user must be a valid user in the current database. The login cannot have another user mapped to it.

Use sp_change_users_login to link a database user in the current database with a SQL Server login. If the login for a user has changed, use sp_change_users_login to link the user to the new login without losing user permissions. The new login cannot be sa, and the user cannot be dbo, guest, or an INFORMATION_SCHEMA user.
sp_change_users_login cannot be executed within a user-defined transaction

Identify your SQL Server version and edition

This article show you your current Microsoft SQL Server version number and the corresponding product or service pack (SP) level. It also describes how to identify the specific edition Microsoft SQL Server.

Result - Microsoft SQL Server 2000 - 8.00.2039 (Intel X86) May 3 2005 23:18:38 Copyright (c) 1988-2003 Microsoft Corporation Standard Edition on Windows NT 5.2 (Build 3790: Service Pack 2)

SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY ('productlevel'), SERVERPROPERTY ('edition')
Result - 8.00.2039 , SP4 , Standard Edition