Svetlin Nakov - Database Transactions
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Svetlin Nakov - Database Transactions
- 1. Database Transactions and Transaction Management Svetlin Nakov National Academy for Software Development academy.devbg.org
- 4. What is a Transaction?
- 6. A Transaction Rollback Commit Read Write Write Durable starting state Durable, consistent, ending state Collection of reads and writes
- 46. Sample REDO Log File
- 48. Transactions and SQL Language
- 51. Transactions in SQL Server: Example (2) UPDATE ACCOUNT set balance = balance - ammount WHERE id = from_account; IF SQL%ROWCOUNT <> 1 THEN ROLLBACK; RAISE_APPLICATION_ERROR(-20001, 'Invalid src account!'); END IF; UPDATE ACCOUNT set balance = balance + ammount WHERE id = to_account; IF SQL%ROWCOUNT <> 1 THEN ROLLBACK; RAISE_APPLICATION_ERROR(-20002, 'Invalid dst account!'); END IF; COMMIT; END;
- 56. When and How to Use Transactions?
- 59. Database Transactions and Transaction Management Questions ?