Indexes in Oracle

 Indexes in Oracle

Indexes are used to improve the performance of queries by allowing data to be retrieved more quickly. They are created on one or more columns of a table and are used to speed up searches and sorts. Here is an example:

CREATE INDEX emp_name_idx ON employees (last_name, first_name);

This creates an index named "emp_name_idx" on the "last_name" and "first_name" columns of the "employees" table.