15: Managing Concurrency in .NET

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request_session_id 75 What is request_session_id 75, or how can you easily find out what it is A It is the master database B It is the tempdb database C By executing sp_who 75, you can identify who it is D It s impossible to tell with the information given 4 You are called in as a consultant to help a company improve the performance of reports You identify that the reports are running slowly due to contention with the sales application that is making frequent changes to the data The CEO says that users should be able to see changes made to data even if they haven t been committed yet What do you do A Configure the reports to use a transaction isolation level of Read Committed B Configure the reports to use a transaction isolation level of Read Uncommitted C Configure the sales application to use a transaction isolation level of Read Committed D Configure the sales application to use a transaction isolation level of Read Uncommitted 5 You are called in as a consultant to help a company track down some deadlock events You need to be able to identify the causes of the deadlocks What tool would you use A System Monitor B SSMS C Activity Monitor D SQL Profiler
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70-431 1 B Of the three pages in Activity Monitor, the only one that has Blocked By or Blocking columns is the Process Info page The Locks By Object and Locks By Process pages do not have these columns Since you suspect Sally is being blocked, you would check the Blocked By column 2 A The sysdm_exec_requests DMV can be used to identify details of specific sessions The blocking_session_id column would identify the source of the block if one exists The sysdm_tran_locks DMV does not have a blocked_by or blocking_session_id column
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3 B The Kill Process command is available in the Activity Monitor, available in the Management container of SSMS It is not available in the other tools mentioned 4 A We want to kill the process that is doing the blocking 76 in this question The command is Kill with the number of the process There is no such command as Kill Process xx 5 C A 1205 error indicates deadlocks To capture data on all participants in the deadlock event, use the Lock:Deadlock Chain event class in SQL Profiler The Lock: Deadlock event class doesn t capture information on participants leading up to the deadlock System Monitor doesn t have any counters for transaction isolation levels, and it isn t possible to set transaction isolation levels for the server 70-444 1 A You want to reset the statistics in the sysdm_os_wait_stats DMV This can be done with the DBCC SQLPERF(DMV, CLEAR) command It s not possible to reset individual columns (such as the max_wait_time column) Restarting service will impact the users 2 D The sysdm_tran_locks DMV returns information on currently occurring locks Since the problem is occurring now, it should be used and compared with the results when the problem is not occurring Sleeping processes are normal The sysdm_exec_requests DMV can be used to obtain details on specific sessions once a locking problem has been confirmed There isn t a stored procedure named sp_Kill_Locking_Process 3 C The sp_who stored procedure can be used to easily identify details on a session ID 4 B Since users can view changes to data even if they haven t been committed, the logical choice is Read Uncommitted Read Committed would use locks to prevent dirty reads Since the reports are reading the data, and the application is modifying the data, the transaction isolation level would be placed on the reports transaction 5 D SQL Profiler using the Deadlock, Deadlock Graph, and Deadlock Chain events would allow you to identify the causes System Monitor will help you verify deadlocks are occurring, but it isn t easily used to identify the cause SSMS includes Activity Monitor Activity Monitor can be used to identify locks occurring now, but isn t useful when trying to capture activity
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