Create, Drop and alter index
In SQL Server 2008, an index is a database object that improves the performance of queries by providing a fast and efficient way to retrieve data from a table. Indexes can be created, dropped, and altered using SQL commands.
Here’s a brief overview of how to create, drop, and alter indexes in SQL Server 2008:
Create Index:
To create an index, you can use the CREATE INDEX statement followed by the name of the index, the table name, and the columns to include in the index. Here’s an example:
arduino
CREATE INDEX idx_name ON table_name (column1, column2);This will create an index named “idx_name” on the “table_name” table, using the “column1” and “column2” columns.
Drop Index:
To drop an index, you can use the DROP INDEX statement followed by the name of the index and the table name. Here’s an example:
graphql
DROP INDEX idx_name ON table_name;This will drop the “idx_name” index from the “table_name” table.
Alter Index:
To alter an index, you can use the ALTER INDEX statement followed by the name of the index, the table name, and the options you want to modify. Here’s an example:
graphql
ALTER INDEX idx_name ON table_name REBUILD;This will rebuild the “idx_name” index on the “table_name” table.
In addition to rebuilding an index, you can also use the ALTER INDEX statement to disable or enable an index, or to modify its properties such as the fill factor or partition scheme. It’s important to note that creating, dropping, or altering an index can have an impact on the performance of your database queries, so it’s important to carefully consider the indexes you create and maintain them regularly.
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