What Is a Rule That Applies to the Two-Phase Locking

question 20

Multiple Choice

What is a rule that applies to the two-phase locking protocol?

• A)Two transactions cannot have conflicting locks.
• B)No unlock operation can precede a lock operation in a different transaction.
• C)No data is affected until all locks are released.
• D)No data is affected until the transaction is in its locked position.

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Definitions:

Tailgating

A breach of physical security that occurs when an unauthorized person enters a secure space behind an authorized person. Training and diligence by all employees are the only ways to stop tailgating.

Mantrap

A method of separating a nonsecure area from a secure area to prevent unauthorized access and tailgating.

Computer Cage

A secure and protective enclosure designed to house and safeguard computer hardware components, typically used in server and professional computing environments.

Shoulder Surfing

Someone behind you looking at what you type or what is on the screen to glean unauthorized information.