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You can use a SELECT statement to query a queue by using the queue name in the FROM clause as if it were a source table or view. Be sure to use the NOLOCK hint so applications attempting to read the queue are not blocked inadvertently. However, you cannot use an INSERT, UPDATE, DELETE, or TRUNCATE statement to modify the queue. Here is an example to query the queue described earlier in this chapter:
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USE MyDatabase; SELECT * FROM dbo.MyRequestQueue WITH (NOLOCK);
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Of course, you need messages in the queue awaiting retrieval to see the results.
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Summary
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After reading this chapter, you should have a general understanding of how Notification Services and Service Broker can be used to share information. Whether sending messages
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Part V
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Microsoft SQL Server 2005 Business Intelligence
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to subscribers when events of interest occur or exchanging messages asynchronously between applications, these technologies expand the potential of your SQL Server environment. The basic examples provided in this chapter are simply a starting point for the development of your skills with these messaging components. Be sure to read the recommended materials to gain a deeper understanding of Notification Services and Service Broker in preparation for developing production-ready systems for your organization.
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Part VI
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High Availability
25 Disaster Recovery Solutions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .815 26 Failover Clustering Installation and Configuration . . . . . . . . . . . . . . . . . . .831 27 Log Shipping and Database Mirroring . . . . . . . . . . . . . . . . . . . . . . . . . . . . .871
25
Disaster Recovery Solutions
What Are High Availability and Disaster Recovery . . . . . . . . . . . . . . . . . .816 Fundamentals of Disaster Recovery and Disaster Survival . . . . . . . . . . . . .817 Microsoft SQL Server Disaster Recovery Solutions . . . . . . . . . . . . . . . . . . .820 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .829
Database administrators are constantly plagued with how to ensure that their business and mission critical databases are always available. Failure to ensure availability can adversely affect revenues and customer satisfaction. To protect the company s data resources, you must establish an architecture that can account for each component of the data infrastructure to provide high availability and recoverability. However, high availability and disaster recovery are not synonymous concepts, as they each provide a different level of database protection. There are many types of protection that provide for many types of disaster scenarios. Disasters can take the form of a natural disaster such as Hurricane Katrina, or a manmade disaster such as the DBA deleting a table in the production database when it should have been deleted in the test database. Whether the disaster is major, such as the loss of a data center, or as minor as the loss of a single table, the effect can be just as devastating. There is not one single solution that will protect you from all disasters. You should build upon a number of technologies to protect you from different failure scenarios. For example, you might choose to set up a standby database, which is very good. However, this should not preclude you from using a RAID I/O subsystem to protect you against a disk failure. Creating a highly available, robust system involves many layers, starting with redundant components such as disk drives to protect you against disk failure, backups to protect you against user error, hardware failures and software failures, and redundant data centers to protect against a large-scale disaster such as the loss of the data center. No one solution will cover everything. In addition, the disaster recovery components and plan must be thoroughly documented and tested. The person putting together the plan might not be available when it is necessary to put it into play; therefore, it must be well documented. The entire IT staff must be
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