Practical Exercises to Master MySQL Transactions and Concurrency
Transactions and Concurrency Exercises with solutions [20 exercises with solution]
1. Start a Transaction and Commit Changes
Write a MySQL query to start a transaction, update a column, and commit the changes.
2. Rollback a Transaction on Error
Write a MySQL query to start a transaction, attempt to update a column, and rollback the changes if an error occurs.
3. Set Isolation Level to Read Committed
Write a MySQL query to set the isolation level to READ COMMITTED and perform a read operation.
4. Set Isolation Level to Serializable
Write a MySQL query to set the isolation level to SERIALIZABLE and perform a read operation.
5. Handle Deadlocks
Write a MySQL query to handle a deadlock situation by retrying the transaction.
6. Use Savepoints in a Transaction
Write a MySQL query to create a savepoint within a transaction and rollback to that savepoint if needed.
7. Demonstrate Dirty Read
Write a MySQL query to demonstrate a dirty read by reading uncommitted data from another transaction.
8. Demonstrate Non-Repeatable Read
Write a MySQL query to demonstrate a non-repeatable read by reading different data in the same transaction.
9. Demonstrate Phantom Read
Write a MySQL query to demonstrate a phantom read by reading new rows inserted by another transaction.
10. Use Explicit Locking with FOR UPDATE
Write a MySQL query to use FOR UPDATE to lock rows for update within a transaction.
11. Use Explicit Locking with LOCK IN SHARE MODE
Write a MySQL query to use LOCK IN SHARE MODE to lock rows for reading within a transaction.
12. Demonstrate Lost Update Problem
Write a MySQL query to demonstrate the lost update problem when two transactions update the same row concurrently.
13. Prevent Lost Updates with FOR UPDATE
Write a MySQL query to prevent the lost update problem using FOR UPDATE.
14. Use Transactions to Ensure Atomicity
Write a MySQL query to demonstrate how transactions ensure atomicity when transferring funds between two accounts.
15. Rollback on Constraint Violation
Write a MySQL query to rollback a transaction if a constraint violation occurs.
16. Set Isolation Level to Repeatable Read
Write a MySQL query to set the isolation level to REPEATABLE READ and perform a read operation.
17. Demonstrate Read Uncommitted Isolation Level
Write a MySQL query to demonstrate the READ UNCOMMITTED isolation level by reading uncommitted data.
18. Use Transactions to Ensure Consistency
Write a MySQL query to demonstrate how transactions ensure consistency when updating multiple tables.
19. Demonstrate Serializable Isolation Level
Write a MySQL query to demonstrate the SERIALIZABLE isolation level by preventing phantom reads.
20. Use Transactions to Ensure Durability
Write a MySQL query to demonstrate how transactions ensure durability by committing changes..
More to Come !
Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.
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