Implementing Log Shipping in VS .NET

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Implementing Log Shipping
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best setup for effective administration of your log shipping process. Table 18-1 defines each component.
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Table 18-1 Log Shipping Terms
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Term Primary database
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Definition The primary database is the original database that s distributed to other servers. The primary database receives the updates from the application. The secondary database is the distributed copy of the primary database. The secondary database is frequently synchronized through transaction log restores. The primary server is the SQL Server database engine instance that owns the primary database. The secondary server is the SQL Server database engine instance that owns a secondary database. You can configure multiple secondary servers. The monitor server is the SQL Server database engine instance that keeps track of the log shipping process and raises alerts when the process fails.
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Secondary database
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Primary server Secondary server
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Monitor server
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Figure 18-1 illustrates these components in a typical log shipping configuration.
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Monitor Server Primary Server Secondary Server
Primary Database
Secondary Database
Figure 18-1 Typical log shipping configuration
Lesson 1: Preparing to Log Ship
BEST PRACTICES
Server configuration
The same server can play different roles within the same log shipping configuration or in different log shipping configurations. For example, you could use the same server as both the primary server and the monitor server in the same configuration. However, to create a more fault-tolerant system, you shouldn t use the monitor server as the primary or secondary server in the same configuration.
The log shipping process consists of three main operations:
Backing up the transaction log of the primary database. Copying the transaction log backup to each secondary server. Restoring the transaction log backup on the secondary database.
Understanding Log Shipping Requirements
Log shipping requires the following infrastructure:
You must have at least two SQL Server 2005 database engine servers or two database engine instances in your log shipping implementation. To configure a separate monitor server, you need three servers or three instances. However, for testing and learning purposes, you can configure the same server as the primary, secondary, and monitor server. All servers participating in the log shipping process must have SQL Server 2005 Standard, Workgroup, Enterprise, or Developer Edition installed. SQL Server 2005 Express Edition does not support log shipping.
IMPORTANT
SQL Server 2003 log shipping version compatibility
Previous versions of SQL Server cannot participate in a SQL Server 2005 log shipping process.
SQL Server Agent services should be running and configured with network credentials. You can configure log shipping with SQL Server Agent services stopped, but the process doesn t run automatically. The primary database must be configured with the Full or Bulk-Logged recovery model. You must have a shared folder to copy the transaction log backups to. The SQL Server Agent service account of the primary server should have read/write access either to the shared folder or to the local NTFS folder. The SQL Server Agent account of the secondary server should have read access to the shared folder. The user configuring the log shipping process must have sysadmin access to the participating servers.
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Implementing Log Shipping
Quick Check
Your manager wants to use SQL Server 2005 Express Edition to monitor the log shipping process. What should you tell him Log shipping is not supported in SQL Server 2005 Express Edition.
Quick Check Answer
Lesson Summary
Log shipping uses SQL Server Agent jobs to automate the process of backing up, copying, and restoring data from a primary database on one server or instance to one or more secondary databases on another server or instance. You can use the secondary database either to improve application performance by allowing distributed queries or to improve availability. You can also configure a monitor server to record the status and historic information about log shipping jobs. Among the prerequisites for log shipping is that the primary database must be in either Full or Bulk-Logged recovery mode.
Lesson Review
The following questions are intended to reinforce key information presented in this lesson. The questions are also available on the companion 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 SQL Server versions can participate in a SQL Server 2005 log shipping configuration as a monitor server (Choose all that apply.) A. SQL Server 2005 Enterprise Edition B. SQL Server 2005 Express Edition C. SQL Server 2000 Standard Edition D. SQL Server 2005 Workgroup Edition
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