Why transactions ensure data integrity in MySQL - Quick Recap

Recall & Review

beginner

What is a transaction in a database?

A transaction is a group of one or more operations executed as a single unit. It ensures that either all operations succeed or none do, keeping data consistent.

intermediate

What does ACID stand for in database transactions?

ACID stands for Atomicity, Consistency, Isolation, and Durability. These properties guarantee reliable processing of database transactions.

beginner

How does atomicity help maintain data integrity?

Atomicity ensures that all parts of a transaction complete successfully or none do. This prevents partial updates that could corrupt data.

intermediate

Why is isolation important in transactions?

Isolation keeps transactions separate from each other until they finish, preventing interference and ensuring data stays accurate.

intermediate

What role does durability play in transactions?

Durability guarantees that once a transaction is committed, its changes are saved permanently, even if the system crashes.

Which property of transactions ensures all operations succeed or none do?

A Consistency

B Isolation

C Durability

D Atomicity

Atomicity means the transaction is all or nothing, so partial changes do not happen.

What does isolation prevent during concurrent transactions?

A Interference between transactions

B Data loss

C Permanent storage

D Rollback of changes

Isolation keeps transactions from affecting each other until they complete.

Which ACID property ensures data remains correct after a transaction?

A Isolation

B Atomicity

C Consistency

D Durability

Consistency ensures the database stays in a valid state after transactions.

What happens if a transaction fails before commit?

A All changes are rolled back

B Changes become permanent

C Partial changes are saved

D Data becomes inconsistent

If a transaction fails, all changes are undone to keep data integrity.

Durability guarantees that committed data is:

A Temporary

B Saved permanently

C Lost on crash

D Isolated from other transactions

Durability means committed changes survive system failures.

Explain how the ACID properties of transactions help ensure data integrity.

Think about how each property protects data during and after transactions.

Describe what happens when a transaction fails and how it affects data integrity.

Focus on the all-or-nothing nature of transactions.