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You can accomplish log shipping either by using the components built into SQL Server or by custom coding all the logic. Both methods are used extensively within the industry. The built-in log shipping components consist of a set of stored procedures and tables. The stored procedures are used to configure the jobs that do all the work in a log ship ping architecture as well as maintain the entries in the log shipping tables. The log shipping tables are simply a repository of data that tracks the configuration and oper ational state of the log shipping environment.
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Custom-coded solutions operate on principles that are very similar to the built-in code that Microsoft ships. Log shipping is, very simply, the automation of continuously copy ing and restoring transaction log backups. Custom-coded solutions generally contain stored procedures that accomplish the backup and restore process. SQL Server Agent jobs are then manually created to execute the procedure to back up the transaction logs on a routine basis, copy the backups to one or more secondary servers, and execute the stored procedure to restore the transaction log backups in order on the secondary.
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Log shipping relies on transaction log backups. If the recovery model is changed to simple, log shipping ceases to function. Similarly, issuing a BACKUP LOG WITH TRUNCATE_ONLY command also breaks log shipping.
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Log shipping is an automated way to continuously apply backups to one or more standby servers. The primary database is online and accepting transactions. The secondary database has a continuous chain of transaction log backups applied to it. The monitor server is an optional component that sends alerts when the second ary database gets too far out of sync with the primary database.
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You can use the following questions to test your knowledge of the information in Les son 1, Overview of Log Shipping. The questions are also available on the compan ion CD if you prefer to review them in electronic form.
NOTE
Answers
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.
1. Which of the following are valid roles for log shipping A. Principal B. Primary C. Distributor D. Standby
Lesson 2: Initializing Log Shipping
Lesson 2: Initializing Log Shipping
Log shipping operates by taking a continuous chain of transaction log backups against the primary database and applying them to the secondary database. To ensure that transaction log backups can be applied to the secondary database, you must ensure that both primary and secondary databases are synchronized. This lesson explains the process required to initialize a log shipping session.
After this lesson, you will be able to:
Specify the primary server and secondary server.
Estimated lesson time: 25 minutes
Log Shipping Initialization
Getting a log shipping architecture running is a fairly straightforward process that does not incur any downtime on the primary database.
NOTE
Built-in or custom-coded
The only difference between using custom-coded log shipping and using the built-in components that ship with SQL Server involves variances related to business requirements. Custom-coded log shipping generally accounts for additional requirements of a specific business environment. Both methods operate on the same principles: continuously restoring transaction logs to a secondary database. To simplify the explanation of log shipping, we confine the remaining two lessons in this chapter to the built-in components that ship with SQL Server 2005.
The basic process for initializing log shipping is as follows: 1. Because the backups need to be accessed across servers, you need to create a share on both the primary and secondary. 2. Create jobs to back up transaction logs, copy logs to the secondary, and restore the logs. 3. Restore full backup to the secondary database. 4. Restore all subsequent transaction logs. 5. Start up jobs to automate restoration of the logs. 6. Copy any instance-level objects that the secondary database depends on to ser vice applications.
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