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You can also back up the primary log file using the NORECOVERY syntax puts the primary database in a recovery state. This allows the secondary to repoint back to the primary once the failed server is fixed. However, this option requires the database to be in single user mode, thus requiring a restart before proceeding.
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4. Restore the tail to the secondary and recover the database manually. Now restore the last transactions from the tail of the transaction log to the secondary server and recover the database so users can access it:
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USE master ; RESTORE LOG prod FROM DISK='\\srvbox000fm\h$\sql\backup\tail.trn' WITh RECOVERY ;
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5. Resolve logins. Run the following stored procedure to resolve the logins between the primary and secondary databases (using your own database names):
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EXEC sp_resolve_logins @dest_db = 'prod', @dest_path = '\\srvbox000fm\h$\', @filename = 'syslogins.dat' GO
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See the section titled Failovers: Users, Logins in this chapter for a complete explanation of syslogins and sysusers in the recovery process.
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Substitute your database destination and path in this command.
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At this point, users can now log into the database using their login and passwords that they use on the primary database server. 6. Next point this application to the new database server IP address or change the ODBC DSN connection string and other specifications so the application can find
Part VI
High Availability
the new database server. Additionally, depending on the configuration, you may need to take the new primary database server (that was previously the secondary) and point to a new secondary server. This requires going through the configuration process again. All of this is application-dependent and dependent on how it fits into your site s high availability plan for business continuity. While this may seem cumbersome, you should have all of this scripted out, and it should not take more than a few minutes to complete all of the steps during an emergency. Note
The keys to successful failover are planning, documentation, and testing. Have all of the processes debugged and scripted well in advance. The last thing a DBA needs is to debug a recovery process in an emergency situation. In addition to documenting the system, also have a tape recall policy, support and account numbers, management escalation paths, hotels, and 24-hour food outlets documented.
Removing Log Shipping
Removing log shipping is very easy. Simply go into the log shipping configuration window as discussed in the section Configuring Log Shipping and then clear the Enable This As A Primary Database In A Log Shipping Configuration check box, as shown in Figure 27-3, and click OK to continue. You are prompted that this will remove log shipping. Next, a window pops up that shows you the status of the log shipping jobs being removed.
Tuning Log Shipping: Operations and Considerations
Log shipping can be planned in two basic configurations: one for data availability, and the other for performance and availability. In the former case, the company is looking for access to the data not for performance reasons but for recovery times and accessibility that are faster than going to a backup tape and rebuilding a system. The reasons for this might be an offline reporting server, staggered copies of the data for advanced recovery scenarios, or just having another option in their recovery choices. In this scenario, older systems are typically used. Performance is not a key consideration. In the latter scenario, availability and performance, companies are planning on failing over a production environment to a secondary disaster database. In this case, the company needs a system that can handle as many users and batch processes on the database server as the primary server. The hardware requirements for this case are significantly different than having a system that is used as a reporting server.
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