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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
Determine the best creation method. Indexes are created in the following ways: By defining a PRIMARY KEY or UNIQUE constraint on a column by using CREATE TABLE or ALTER TABLE. The SQL Server Database Engine automatically creates a unique index to enforce the uniqueness requirements of a PRIMARY KEY or UNIQUE constraint.