Storage Data Manager

Storage Data Manager is also known as Database Control Unit.

It further converts the instruction received from Query Optimizer to machine understandable from.

It makes the actual Data Base request

It is also responsible to maintain integrity, consistency throughout the database.

It also controls the user access and makes the correct data available to different users who are logged into database at the same time.

It also guarantees that there is no data loss or data miss match in multi user transactions.

It is also responsible from data back and data recovery.