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ROLLBACK;

Web-based product and technology information is available free from Microsoft via the Seminar Online website at www.microsoft.com/seminar (see Figure A-4). By utilizing web-based audio and video streaming technologies, visitors to this website can receive online technical content similar to that received at live conferences. The format includes descriptive slides along with voice narration. It s available on demand, and it works well even in low-bandwidth situations.

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You could have included the WORK keyword and the AND NO CHAIN clause, and the statement would have performed the same function. If you want a new transaction to be initiated when the current transaction is terminated, you must specify the AND CHAIN clause. Keep in mind, however, that you cannot specify the AND CHAIN clause and the TO SAVEPOINT clause because AND CHAIN relies on the transaction being terminated in order to start a new transaction. If you do specify the TO SAVEPOINT clause, you must include the name of the savepoint. For example, the following ROLLBACK statement specifies the SECTION_1 savepoint:

Most RDBMSs also support the use of a FOR UPDATE OF clause on a SELECT statement to allow locks to be placed when the database user declares their intent to update something Some locks may be considered read-exclusive, which prevents other sessions from even reading the locked data Many RDBMSs have session parameters that can be.

ROLLBACK TO SAVEPOINT SECTION_1;

Figure A-3.

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If this statement is executed, all changes that occurred after the SECTION_1 savepoint was created are rolled back to the state the database was in when the SAVEPOINT statement was executed. Even if other savepoints were created after the SECTION_1 savepoint, changes are still rolled back to SECTION_1.

Figure A-4.

Q: A:

set to help control locking behavior. One of the locking behaviors to consider is whether all rows fetched using a cursor are locked until the next COMMIT or ROLLBACK, or whether previously read rows are released when the next row is fetched. Consult your database vendor documentation for more details. The main problem with locking mechanisms is that locks cause contention, meaning that the placement of locks to prevent loss of data from concurrent updates has the side effect of causing concurrent sessions to compete for the right to apply updates. At the least, lock contention slows user processes as sessions wait for locks. At the worst, competing lock requests can stall sessions inde nitely, as you will see in the next section.

Are there any performance implications to using transactions Indeed there are. The DBMS must carefully log the effects of every SQL statement inside a transaction so that changes can be rolled back when needed. And it is possible to fill the memory areas set aside for tracking transactions. To counter this, SQL programmers sometimes break processes that apply lots of changes to the database into multiple transactions using commits. Check your DBMS documentation to see if there are restrictions on using commits during program loops, particularly when cursors are open.

For technical and usage support on Microsoft products, users can call Microsoft s phone-based support. Pricing structures and levels of support vary based on the product, purchased support options, and special arrangements with companies. For more information on contacting Microsoft Technical Support, see support.microsoft.com.

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