Monday, December 31, 2007

My Web site URL

http://chnagendra.page.tl/

Sunday, December 30, 2007

Saturday, December 29, 2007

Thursday, December 27, 2007

What Methods are fired during the page load? / Web Form Events

Life Cycle of ASP.NET Request

From the moment a user first requests an ASP.NET Web Form to the moment the server actually sends the response, quite a few events and processes occur. A few of the most important ones are described in the following sections.

Init() - when the page is instantiated (Initialize objects and variables needed throughout the life cycle of the request.)

LoadViewState() – View state information is loaded into the viewStatepropery of web controls that have it enabled.

Load() - when the page is loaded into server memory. (All the controls are loaded and initialized and their properties set.)

SaveViewState() – View state information is serialized to a string. The information is transmitted to the client in a hidden form.

PreRender() - the brief moment before the page is displayed to the user as HTML. (Output is generated to the clent.)

Dispose() – Final cleanup of objects associated with the request.Unload() - when page finishes loading.

Friday, December 21, 2007

Thursday, December 20, 2007

Optimizing SQL Queries


** Use stored procedures instead of heavy-duty queries.

This can reduce network traffic as your client will send to the server only the stored procedure name
(perhaps with some parameters) instead of all the text from a large heavy-duty query. Stored procedures can be used to enhance security.

** Avoid recompile the stored procedures.

Stored procedures are recompiled using the WITH RECOMPILE clause in the CREATE PROCEDURE or the EXECUTE statement.
Running stored procedures with sp_recompile

The WITH RECOMPILE option prevents reusing the stored procedure execution plan, so SQL Server does not cache a plan for this procedure and the procedure is always recompiled at run time.

Recompilations cannot be helped. So don’t create stored procedures with recompile.
Specify KEEPFIXED PLAN (to avoid recompiles) Forces the query optimizer not to recompile until schema is changed.

** Include the SET NOCOUNT ON statement in your stored procedures to stop the message indicating the number of rows affected by a Transact-SQL statement.

This can reduce network traffic due to the fact that your client will not receive the message indicating the number of rows affected by a Transact-SQL statement.

** Call stored procedures using their fully qualified name.

The complete name of an object consists of four identifiers: the server name, database name, owner name, and object name. An object name that specifies all four parts is known as a fully qualified name.
Using fully qualified names eliminates any confusion about which stored procedure you want to run and can boost performance because SQL Server has a better chance to reuse the stored procedures execution plans if they were executed using fully qualified names.

** Don't use the prefix "sp_" in the stored procedure name if you need to create a stored procedure to run in a database other than the master database.

This special prefix is reserved for system stored procedures. Although using this prefix will not prevent a user defined stored procedure from working, what it can do is to slow down its execution ever so slightly.

The reason for this is that by default, any stored procedure executed by SQL Server that begins with the prefix "sp_", is first attempted to be resolved in the Master database. Since it is not there, time is wasted looking for the stored procedure.

If SQL Server cannot find the stored procedure in the Master database, then it next tries to resolve the stored procedure name as if the owner of the object is "dbo". Assuming the stored procedure is in the current database, it will then execute. To avoid this unnecessary delay, don't name any of your stored procedures with the prefix "sp_".

** Before you are done with your stored procedure code, review it for any unused code
That you may have forgotten to remove while you were making changes, and remove it. Unused code just adds unnecessary bloat to your stored procedures.

** If you need to delete all the rows in a table
, doesn’t use DELETE to delete them all, as the DELETE statement is a logged operation and can take time. To perform the same task much faster, use the TRUNCATE TABLE instead, which is not a logged operation.

** Indexes should be considered on all columns that are frequently accessed by the WHERE, ORDER BY, GROUP BY, TOP, and DISTINCT clauses.
Without an index, each of these operations will require a table scan of your table, potentially hurting performance.

** Try to avoid using temporary tables inside your stored procedures.

Using temporary tables inside stored procedures reduce the chance to reuse the execution plan.

** Use the sp_executesql stored procedure instead of temporary stored procedures.
Temporary stored procedures do not support the reuse of execution plans. Use the sp_executesql system stored procedure instead of temporary stored procedures in order to have a better chance of reusing the execution plans.

** Use SQL Server Profiler

To determine which stored procedures have been recompiled too often.
Deadlocks etc..

Application Domain

The logical and physical boundary created around every .NET application by the Common Language Runtime (CLR). The CLR can allow multiple .NET applications to be run in a single process by loading them into separate application domains. The CLR isolates each application domain from all other application domains and prevents the configuration, security, or stability of running .NET applications from affecting other applications. Objects can only be moved between application domains by the use of remoting.

Wednesday, December 19, 2007

YuvaRaja 6's


video

How do you test your database?

This is a very generic question. I will be describing my generic database testing method as well as stored procedure testing methods.

Testing Databases:
  • Table Column data type and data value validation.
  • Index implementation and performance improvement.
  • Constraints and Rules should be validated for data integrity.
  • Application field length and type should match the corresponding database field.
  • Database objects like stored procedures, triggers, functions should be tested using different kind of input values and checking the expected output variables.


Testing Stored Procedures:
  • Understand the requirements in terms of Business Logic.
  • Check that code follows all the coding standards.
  • Comparing the fields' requirements of application to the fields retrieved by a stored procedure. they should match.
  • Repeatedly run stored procedures many times with different input parameters and compare the output with expected results.
  • Pass invalid input parameters and see if a stored procedure has good error handling..


what are the five top responsibilities of DBA?

I rate following five tasks as the most important responsibilities of DBA.

1. Securing the database from physical as well as logical integrity damage.
2. Restore the database from backup as part of disaster management plan.
3. Optimize the queries performance by proper indexing and optimizing joins, where conditions, select clause etc.
4. Design the new schema and support legacy schema as well legacy database systems.
5. Help developers to be better at writing SQL related code.

Saturday, August 11, 2007

Wednesday, August 8, 2007

Will india win series

We have a chance of winning the series if we work it out as a team.