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What are the types of indexes available with SQL Server?

Posted By :Shashi Ray     Posted Date :October 03, 2008    Points :10   Category :Sql Server 
There are basically two types of indexes that we use with the SQL Server. Clustered and the Non-Clustered.

You can also find related Interview Question to What are the types of indexes available with SQL Server?  below: 

What are the types of indexes available with SQL Server?

There are basically two types of indexes that we use with the SQL Server. Clustered and the Non-Clustered. (More...)

How many types of tables are present in SQL SERVER?

There are 2 types of temporary tables, local and global in sql server.

Local temporary tables are created using a single pound (#) sign and are visible to a single connection and automatically dropped when that connection ends.

Global temporary tables are created using a double pound (##) sign and are visible across multiple connections and users and are automatically dropped when all SQL sessions stop referencing the global temporary table. (More...)

Indexes in SQL Server?

Indexes in SQL Server are similar to the indexes in books. They help SQL Server retrieve the data quicker.

Indexes are of two types. Clustered indexes and non-clustered indexes. When you craete a clustered index on a table, all the rows in the table are stored in the order of the clustered index key. So, there can be only one clustered index per table. Non-clustered indexes have their own storage separate from the table data storage. Non-clustered indexes are stored as B-tree structures (so do clustered indexes), with the leaf level nodes having the index key and it's row locater. The row located could be the RID or the Clustered index key, depending up on the absence or presence of clustered index on the table.

If you create an index on each column of a table, it improves the query performance, as the query optimizer can choose from all the existing indexes to come up with an efficient execution plan. At the same t ime, data modification operations (such as INSERT, UPDATE, DELETE) will become slow, as every time data changes in the table, all the indexes need to be updated. Another disadvantage is that, indexes need disk space, the more indexes you have, more disk space is used. (More...)

How many types of Stored Procedures are there in Sql Server?

1. User Defined Stored Procedures.
a. Transact-SQL stored procedure
b. CLR Stored Procedure.

2. System Stored Procedures (More...)

What are the two types of Triggers in SQL Server?

1. After Triggers : Fired after Insert, Update and Delete operations on a table.
2. Instead of Triggers: Fired instead of Insert, Update and Delete operations on a table.


What are the 2 types of Temporary Tables in SQL Server?

1. Local Temporary Tables
2. Global Temporary Tables


What are the Lock Types in SQL server?

Shared lock
Update lock
Exclusive lock (More...)

What are different types of cursors available in SQL Server?

Following are different types of cursors available in SQL Server 2005
Base table
Base table: Base table cursors are the lowest level of cursor available. Base table cursors can scroll forward or backward with minimal cost, and can be updated
Static: Cursor can move to any record but the changes on the data can't be seen.
Dynamic: Most resource extensive. Cursor can move anywhere and all the changes on the data can be viewed.
Forward-only: Cursor moves one step forward, can't move backwards.
Keyset-driven: Only updated data can be viewed, deleted and inserted data cannot be viewed. (More...)

Database Concurrency in Sql Server.

When two or more user try to update same type of data in a table then Database Concurrency helps in this situation.

There are 2 types of Database Concurrency

Pessimistic: When one user try to change the data with pessimistic concurrency then a lock is placed on the data in a table so that another user cannot change data. when one user finishes then other user can able to change.

Optimistic: When two user works on the same data in a table and one change that data first then second user cannot change that same data becasue the which he have using is allready changed so he cannot do the change becasue change apply to another data that is changed by first user. (More...)

Is it true that COM objects no longer need to be registered on the server?

Yes and No. Legacy COM objects still need to be registered on the server before they can be used. COM developed using the new .NET Framework will not need to be registered. Developers will be able to auto-register these objects just by placing them in the 'bin' folder of the application. (More...)

What are server controls?

ASP.NET server controls are components that run on the server and encapsulate user-interface and other related functionality. They are used in ASP.NET pages and in ASP.NET code-behind classes. (More...)

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