ACID properties, transactions and concurrency
50 min · Intermediate
A transaction is a group of database operations that must succeed or fail as one unit, such as moving Rs 500 from one UPI-linked account to another: the debit and the credit must both happen or neither. The ACID properties describe what a DBMS guarantees for transactions; Section 12's Transactions & ACID module shows them in MySQL.
Topics in this lesson
- ACID with a bank-transfer example
- Transaction states, commit and rollback
- Dirty read, non-repeatable read and phantom read
- Isolation levels and serializability at a high level
- Locks and deadlock in databases
Interview questions this lesson answers
- What is a transaction?
- What are the ACID properties?
- Explain atomicity with an example.
- Explain consistency with an example.
- Explain isolation with an example.
- Explain durability with an example.
- Which component ensures each ACID property?
- What is a write-ahead log?
- What are the states of a transaction?
- What is the difference between COMMIT and ROLLBACK?
Sign in free to continue this lesson
Create a free account to read every lesson, practise with the exercises and keep track of your progress.