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Answers
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C. Incorrect: The Number of Deadlocks/sec performance counter returns the number of lock requests per second that resulted in a deadlock. A high value in this counter can indicate deadlock problems, but the counter is not a good indicator of overall database performance. D. Incorrect: The Transactions/sec counter records transactions that change data, or explicit transactions. The counter is useful for determining whether the number of transactions run against a database has increased substantially, but is not a good indicator of overall database performance. 3. Correct Answer: C A. Incorrect: Read Committed is the default isolation level. It does not permit a transaction to access data that has been modified but not committed by other transactions. B. Incorrect: Creating an indexed view is probably a good idea, but it does not permit a transaction to access data that has been modified but not committed by other transactions. C. Correct: The Read Uncommitted isolation level allows transactions to read uncommitted modifications (dirty reads), which is what is required in this scenario. D. Incorrect: The Repeatable Read isolation level specifies that statements cannot read data that has been modified but not yet committed by other transactions and that no other transactions can modify data that has been read by the current transaction until the current transaction completes.
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Case Scenario: Dealing with Compatibility Problems and Fragmented Indexes
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1. Specify the Read Uncommitted isolation level. Read Uncommitted transactions are not blocked by exclusive locks that would prevent the current transaction from reading rows that have been modified but not committed by other transactions. Because these locks are not required, less memory is needed to manage locks. 2. When you rebuild the index, specify a non-zero fill factor setting say 75 percent and set the pad index option to ON. A non-zero fill factor (zero means 100 percent)
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Answers
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leaves space on leaf-level pages so that less splits occur when data is written. Setting the pad index to ON applies the fill factor to intermediate as well as leaf-level pages. 3. Create a plan guide for the query. Plan guides apply query hints to queries in deployed applications when you cannot or do not want to change the application directly. In this case, the plan guide makes the query ignore the unsuitable query hint. If necessary, you can use the plan guide to apply a different query hint.
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Lesson 1
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1. Correct Answer: B A. Incorrect: If the tempdb database had run out of disk space, other databases on the server also would be experiencing errors. B. Correct: If a significant amount of disk space is still left on a volume and the database is behaving as though it has run out of space, it is likely that a limit has been placed on the database file s expansion. You can remove this limit by enabling auto-grow. C. Incorrect: In this case, it appears that auto-grow has already been disabled and that the resolution to the problem is to enable it. D. Incorrect: In this example, it appears that the database s MAXSIZE has been reached. Reducing this parameter will not fix the problem. 2. Correct Answer: B A. Incorrect: If the tempdb database was full, different error codes would be issued. B. Correct: The SQL Server database engine issues a 9002 error when the transaction log is full. C. Incorrect: If the volume hosting the database files was full rather than the transaction log, errors 1101 or 1105 would be visible in the log rather than error 9002. In both cases, however, the database would be unable to process updates. D. Incorrect: If the version store was full, error 3959 would be generated rather than error 9002.
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