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However, the theory is to inspect each lock request for the potential to cause contention and not permit the lock to take place if a deadlock is possible The more common approach is deadlock detection, which then aborts one of the requests that caused the deadlock This can be done either by timing lock waits and giving up after a preset time interval or by periodically inspecting all locks to nd two sessions that have each other locked out In either case, one of the requests must be terminated and the transaction s changes rolled back in order to allow the other request to proceed..

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:

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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.

Table A-2.

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Choose the correct responses to each of the multiple-choice questions. Note that there may be more than one correct response to each question. 1. A transaction a. May be partially processed b. May not be partially processed

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:

Appendix:

SELECT CD_TITLE, IN_STOCK FROM COMPACT_DISCS WHERE LABEL_ID = 832;

c. Changes the database from one consistent state to another d. Is sometimes called a unit of work e. Has properties described by the ACID acronym 2. The A in the ACID acronym stands for a. Automatically b. Auxiliary c. Atomicity d. Augmented e. Availability 3. The C in the ACID acronym stands for a. Correlated b. Consistency c. Committed d. Calculated e. Consolidated 4. The I in the ACID acronym stands for a. Integration b. Immediacy c. Iconic d. Isolation e. Information 5. The D in the ACID acronym stands for a. Durability b. Dedication c. Duality d. Database e. Distribution 6. The process that backs out changes made by a failed transaction is called a. Transaction logging b. Commit c. Rollback

Your query results should show the same IN_STOCK values as the query results returned in the previous two steps.

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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:

Database backups When you are dealing with database backups, several other considerations must be made. Relational database management systems (RDBMSs) such as SQL Server have transaction logs and typically use large files that must remain internally consistent. The overall concepts are the same backups can store either all information or just changes. We ll look at the details in later chapters.

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