This step is optional. To enhance performance, Sybase recommends that you create a unique index that contains only the IDENTITY column. For example, to create a unique index named reviews_id on the IDENTITY column created in the previous procedure, issue:
create unique index reviews_id on reviews(id)
For more information about creating a unique index, see Chapter 11, “Creating Indexes on Tables,” ofthe Transact-SQL User’s Guide.
