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external event to finish. When you diagnose blocking issues, you need to remember that external waits do not always imply that the worker is idle because the worker might be actively running external code. Specific types of wait times during query execution can indicate bottlenecks within the query. Similarly, high wait times or server-wide wait counts can indicate bottlenecks in query interactions within the server instance. For example, lock waits indicate data contention by queries, page I/O latch waits indicate slow I/O response times, and page latch update waits indicate incorrect file layout. All data returned by this DMV is cumulative since the last time you reset the statistics or started the server. Therefore, if the DMV returns a high value for (say) max_wait_ time_ms, you need to determine whether this is a result of current performance problems. If it is, you need to reset the statistics in the DMV and query the counters again when new statistics have accumulated. You can reset the contents of this DMV view by running the following command:

What is the difference between a hot standby and a warm standby Both hot standby solutions and warm standby solutions can have auto matic failure detection. However, a hot standby solution has a mechanism to automatically fail over, whereas a warm standby solution requires a man ual failover mechanism.

A warm standby solution can have either a manual or automatic failure detection mechanism, but it requires manual intervention to fail over. A hot standby solution has a mechanism to automatically detect failure as well as automatically fail over. Implementing a procedure to continuously evaluate and make improvements to processes and procedures within your environment ensures that the technology needed to achieve high availability will continue to meet business needs.

Once the partition is created, you can see the new partition records using the sys.partitions object catalog view. For example, the following Transact-SQL statement can be used to view all partitions for the object named Product :

You can use the following questions to test your knowledge of the information in Les son 3, Planning a Database Migration Strategy. The questions are also available on the companion CD if you prefer to review them in electronic form.

2

select * from sys.partitions where object_name(object_id) = 'Product'

7

Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.

Before the partition scheme was added, the previous query would have returned four records. Each record represented one of the four indexes for the Production.Product table. Now that the partition has been created, the query will return six records, as follows:

1. Which of the following is a hot standby technology choice A. Failover clustering B. Log shipping C. Database Mirroring D. Replication

6. From the Programs menu, select Microsoft SQL Server 2005 and click SQL Server Management Studio. Connect to the database engine on your member server. Specify Windows Authentication, the TCP/IP protocol, and the AdventureWorks database. 7. Click New Query to start the Query Editor 8. In the Query pane, type the following text:

To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:

Partition ID 72057594056278016 72057594056343552 72057594056409088 72057594056474624 72057594056540160 72057594056605696 Object ID 1429580131 1429580131 1429580131 1429580131 1429580131 1429580131 Index ID Partition Number 0 0 0 2 3 4 1 2 3 1 1 1 Hobt ID 72057594056278016 72057594056343552 72057594056409088 72057594056474624 72057594056540160 72057594056605696 Rows 129 176 199 504 504 504

Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenario. This scenario sets up a real-world situation involv ing the topics of this chapter and asks you to create solutions. Complete the suggested practices. Take a practice test.

The last column in the query result is the number of rows, and the first three records represent the partition for the Product ID index. Notice that the number of rows for these records totals 504, which is the number of records in the Production.Product table. You can see how many records exist within each partition. If the distribution is not acceptable, you would need to drop and re-create the partition function to specify a different range. As shown in Table 8-2, in addition to the sys.partitions view, SQL Server 2005 includes four other views that can be used to query partition information.

Summary

USE AdventureWorks GO SELECT DISTINCT * FROM HumanResources.Employee WHERE SUBSTRING(NationalIDNumber,1,1) = 8