ORACLE MONITOR INDEX USAGE

ORACLE MONITOR INDEX USAGE

The topic of Oracle Index has become quite important lately. Many of us use it in some form or other, whether in query writing, data processing, or any other kind of activity. Before we look into how to alter and drop an index in Oracle, let us first understand what an index is, and how it is created.

What is an Oracle index?

An Oracle index is a type of database object, created and stored in the Oracle database. It helps to speed up the access of data by users. An index holds the key to the physical location of each row in the table. It is like an index in a book – it helps the reader to find the information he is looking for more easily.

How is an index created in Oracle?

An index is created in Oracle using the CREATE INDEX command, as follows:

ORACLE MONITOR INDEX USAGE

You must specify the name of the index and the table on which the index is to be created, while executing the command. The syntax of this command looks like this:

CREATE [BITMAP] [UNIQUE] INDEX index_name ON table_name (column_name);

Here, ‘BITMAP’ is an optional keyword. It indicates that the index is a bitmap index, which is useful when columns have a low cardinality. The ‘UNIQUE’ keyword specifies that the index is a unique index. It ensures that each value in the columns is unique.

How to Alter and Drop an Index in Oracle?

Altering an index in Oracle is done using the ALTER INDEX command, as follows:

ALTER INDEX index_name [REBUILD] [parameters]

Here, the ‘REBUILD’ keyword is used to rebuild the index, and the parameters contain the various options that can be used to customize this operation.

Dropping an index in Oracle is just a matter of executing the DROP INDEX command. Here is the syntax of this command:

DROP INDEX index_name

This will delete the index from the system, but the data remains intact in the underlying table.

Conclusion

In conclusion, an Oracle index is a type of database object, created and stored in the Oracle database. It helps to speed up the access of data by users. To create an index, we execute the CREATE INDEX command, specifying the index name and the table on which the index is to be created. To alter an index, we execute the ALTER INDEX command and to drop an index, we execute the DROP INDEX command.

FAQs

What is an Oracle Index?

An Oracle index is a type of database object, created and stored in the Oracle database. It helps to speed up the access of data by users.

How to Drop an Index in Oracle?

To drop an index in Oracle, we execute the DROP INDEX command. Here is the syntax of this command: DROP INDEX index_name



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