Transaction: A transaction is a small set of changes which must be made to the database . The transaction done to the database may or may not affect the changes to the content of the database. The execution takes place as a single unit. Concurrency control: The process of ensuring the data which should be updated correctly and appropriately when multiple transactions are concurrently executed in DBMS then it is termed as concurrency control. It coordinates the simultaneous transaction while preserving from deadlock. It ensures that one user work does not affect the other user’s work. There are two mechanism involved in concurrency control Optimistic concurrency control Pessimistic concurrency control.

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Chapter 6, Problem 6.4RQ

Program Plan Intro

Transaction:

A transaction is a small set of changes which must be made to the database. The transaction done to the database may or may not affect the changes to the content of the database. The execution takes place as a single unit.

Concurrency control:

The process of ensuring the data which should be updated correctly and appropriately when multiple transactions are concurrently executed in DBMS then it is termed as concurrency control.

It coordinates the simultaneous transaction while preserving from deadlock.

It ensures that one user work does not affect the other user’s work.

There are two mechanism involved in concurrency control

Optimistic concurrency control

Pessimistic concurrency control.

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