How to create an Oracle Index

To use an index in an Oracle database, you must first create an Oracle index. The following describes how to create an Oracle index.

You can use indexes appropriately to increase the data retrieval speed and create indexes for fields that frequently need to be queried. Oracle indexes are divided into five types: Unique indexes, composite indexes, reverse key indexes, bitmap indexes, and function-based indexes.

Standard syntax for creating an Oracle index:

Create index name ON table name (column name)

TABLESPACE name;

Create a unique index:

CREATE unique INDEX name ON table name (column name)

TABLESPACE name;

Create a composite index:

Create index name ON table name (column name 1, column name 2)

TABLESPACE name;

Create a reverse key index:

Create index name ON table name (column name) reverse

TABLESPACE name;

The preceding describes how to create an Oracle index.

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