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You should receive some sort of message acknowledging the termination of the transaction.
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4. Now you ll confirm that the update you attempted in the preceding step was indeed rolled
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back. Enter and execute the following SQL statement:
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SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832;
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The SELECT statement should return the following query results:
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CD_TITLE ---------------------------That Christmas Feeling Patsy Cline 12 Greatest Hits Out of Africa Blues on the Bayou IN_STOCK -------8 32 29 27
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The IN_STOCK values shown in these results are what were contained in the COMPACT_ DISCS table before you executed the transaction. If the transaction had not been rolled back, each of these values would have been increased by 2.
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5. Now you re going to add a savepoint to the transaction we created in the previous step. You
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want to be sure to reference the savepoint in the ROLLBACK statement. You will also add a SELECT statement before the savepoint. Enter and execute the following SQL transaction:
START TRANSACTION ISOLATION LEVEL SERIALIZABLE; SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832; SAVEPOINT SECTION_1; UPDATE COMPACT_DISCS SET IN_STOCK = IN_STOCK + 2 WHERE LABEL_ID = 832; ROLLBACK TO SAVEPOINT SECTION_1;
Now your transaction will roll back only to the point preceding the UPDATE statement. In addition, because your transaction included a SELECT statement, you should receive the query results that you received in the previous step.
6. In the preceding transaction, the SELECT statement came before the savepoint, which
means that the SELECT statement was executed before the UPDATE statement. If the transaction did not roll back the update, the query results would not reflect the correct information. As a result, you should verify that the UPDATE statement was rolled back. Enter and execute the following SQL statement:
SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832;
Your query results should show the same IN_STOCK values as the query results returned in the previous two steps.
7. Close the client application.
Try This Summary
In this Try This exercise, you created and initiated three transactions. In the first one, you simply queried data and committed the transaction. In the next two, you updated data and then rolled back the updates. However, as you saw in the third transaction, it is possible to roll back a transaction to a specified savepoint. This allows you to protect certain portions of your transaction without having to reprocess statements that have been executed successfully. Because you rolled back the updates that you made, the INVENTORY database should have been left in the same state it was in when you began this exercise.
16:
Managing SQL Transactions
16 Self Test
1. Which transaction characteristic refers to the all-or-nothing nature of a transaction A Atomic B Consistent C Isolated D Durable 2. A(n) ____________ is a unit of work that is made up of one or more SQL statements that
perform a related set of actions.
3. What statement can you use to explicitly initiate a transaction 4. Which SQL statements will terminate a transaction A SAVEPOINT B SET TRANSACTION C ROLLBACK D COMMIT 5. What are the three types of transaction modes that you can specify in a SET
TRANSACTION statement
6. Which access level options can you include in a START TRANSACTION statement A READ ONLY B UPDATE C LOCAL D READ WRITE 7. Two concurrent transactions are active in your system. The first transaction modifies data in
a table. The second transaction sees those modifications before they re actually committed to the database. The first transaction then rolls back the modifications. Which type of data phenomenon has occurred
A Phantom read B Repeatable read C Dirty read D Nonrepeatable read
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8. A(n) ____________ read can occur when a transaction reads a table based on some sort of
search condition, then a second transaction updates the data in the table, and then the first transaction attempts to reread the data, but this time different rows are returned because of how the search condition is defined.
9. What type of constraint can you specify in a SET CONSTRAINTS statement 10. Which isolation level fully isolates one transaction from another transaction 11. You re using a SET TRANSACTION statement to configure transaction modes. You want
to ensure that no nonrepeatable reads and no dirty reads can occur within that transaction. However, you re not concerned about phantom reads. Which isolation level should you use
A READ UNCOMMITTED B READ COMMITTED C REPEATABLE READ D SERIALIZABLE 12. You re setting up a transaction that defers the application of the CK_CD_STOCK constraint
until you execute several SQL statements. After you execute the statements, you want to explicitly apply the constraint to the changes you made to the database. What SQL statement should you use to apply the constraints
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