Implementing Log Shipping in .NET

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Implementing Log Shipping
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Lesson 3: Configuring Log Shipping Mode
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You can use log shipping to increase either the availability or the scalability of your applications. The log shipping mode you select determines which operational requirement you want to use the technology for. If you choose No Recovery Mode, you will use the log shipping configuration for availability reasons only, and the secondary database won t be available for users to query. If you select Standby Mode, you allow users read-only access to the secondary database. This configuration increases the scalability of your application by letting you distribute queries across multiple servers and reduces the primary server s workload. In this lesson, you will learn how to configure log shipping s recovery mode.
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After this lesson, you will be able to:
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Explain how log shipping s No Recovery mode works. Explain how log shipping s Standby mode works. Configure the No Recovery and Standby modes.
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Estimated lesson time: 30 minutes
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How to Configure No Recovery Mode
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As you saw in the previous lesson, log shipping uses transaction log backups, copies, and restores to keep the primary and secondary databases synchronized. Seeing how the restoration process handles incomplete transactions will help you understand the purpose of the log shipping mode. The default behavior of the RESTORE command is to read the transaction log backup, apply all the transactions in the log to the database, and roll back all incomplete transactions when the restore finishes reading the log. However, log shipping configurations cannot use this behavior of the RESTORE command. If the transactions are rolled back, the database changes will be lost, and at this point, you would not know whether the next transaction log restore would commit or roll back the changes. This RESTORE command option is called Recovery Mode, and log shipping doesn t use it. Instead, log shipping uses the No Recovery Mode of the RESTORE command as its default setting. This mode does not roll back incomplete transactions. Incomplete transactions are neither rolled back nor rolled forward; they remain incomplete
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Lesson 3: Configuring Log Shipping Mode
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transactions. One side effect of this option is that the database is not available for user queries. Here s how to use SSMS to set the No Recovery mode of a log shipping configuration: 1. In SMSS, right-click the primary database and choose Properties. Select the Transaction Log Shipping page. 2. Below Secondary Server Instances And Databases, select the secondary database you want to configure and click the browse button ( ). (Or click Add if you want to add a new configuration.) 3. In the Secondary Database Settings dialog box, click the Restore Transaction Log tab. Below Database State When Restoring Backups, select No Recovery Mode, as shown in Figure 18-7.
Figure 18-7 Selecting No Recovery Mode
4. Click OK to save your changes and close the Secondary Database Settings dialog box. 5. Click OK to close the Database Properties dialog box for the primary database.
BEST PRACTICES
Availability
When using log shipping for availability reasons only, use No Recovery mode.
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Implementing Log Shipping
Quick Check
1. What is the default recovery mode setting for log shipping 2. When do you use this recovery mode setting
Quick Check Answers
1. The default setting is No Recovery mode. 2. You use No Recovery mode when you are using log shipping for availability reasons; this mode doesn t allow user access.
How to Configure Standby Mode
Standby mode is the RESTORE command option you use to configure standby servers. In this mode, the secondary database is available for read-only access by users and applications, which enables you to use the secondary database to reduce the workload of the primary database. You cannot use a secondary database in Standby mode to update database information. A log shipping configuration in Standby mode reads the transaction log backup, applies all transactions in the log to the database, and rolls back all incomplete transactions when the restore process finishes reading the log. The difference between Recovery mode and Standby mode is that Standby mode saves all incomplete transactions in a separate Transaction Undo File (TUF). The restore process uses this file to maintain transactional integrity; when the next restore process occurs, it restores all the committed transactions. Here s how to use SSMS to configure Standby mode: 1. In the primary database s Properties window, select the Transaction Log Shipping page. 2. Below Secondary Server Instances And Databases, select the secondary database you want to configure and click the browse button ( ). (Or click Add if you want to add a new configuration.) 3. In the Secondary Database Settings dialog box, click the Restore Transaction Log tab. 4. Below Database State When Restoring Backups, select Standby Mode, as Figure 18-8 shows.
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