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so today we shall discuss index index it is a pointer locates the physical address of data it will improve performance of oracle while retrieving or manipulating data from table it is automatically activated when indexed column is used in where clause it is stored in user underscore indexes system table normal index so let us try this in a sql environment just type c youamp;#39;ll get the command prompt right click on it run as administrator say yes letamp;#39;s maximize the screen sql plus plus forward slash as s y s h d b a so we are successfully connected to sql let us clear this screen so screen has been cleared we shall try as example create index idx 1 on employee job so you can see index created composite index maximum 32 columns allowed create index idx on student name comma course so letamp;#39;s test example copy and paste you can see index created unique index create unique index idx 3 on department d name copy and paste and see index has been created successfully functio