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 (Database Management System) is termed as concurrency control. It coordinates the simultaneous transactions 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. They are, Optimistic concurrency control. Pessimistic concurrency control.

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Two pseudocode questions I need help with: How do I design a module called findSum that will display the sum of two integer passed by parameter, and a module called findArea that will display the area of a rectangle when passed 2 real values for the length and width of the rectangle?

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Chapter 6, Problem 6.6RQ

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 (Database Management System) is termed as concurrency control.

It coordinates the simultaneous transactions 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. They are,

Optimistic concurrency control.

Pessimistic concurrency control.

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