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A new server can be installed, configured, and tested as required with SQL Server 2008 loaded and configured. A full backup of the source 2005 database is made and copied to the new server. The 2005 database is restored to the new 2008 instance on the new server in recovering mode. Log shipping is set up between the old and new server instances with transaction logs shipping on a regular basis. When the upgrade time arrives, users are disconnected from the 2005 instance, remaining logs shipped to the 2008 instance, and the database is then recovered with applications reconfigured to point at the new instance.

Until step 5, the original 2005 instance continues to run with no user interruption. The only downtime comes in step 5, which will typically be very short given the small number of transactions to ship across. The other benefit of this approach is that the original 2005 server still exists as a rollback point with its data still accurate as at the time of the last transaction log ship. This solution could also be used when upgrading or decommissioning server hardware, but like database mirroring, log shipping is implemented on a database-by-database basis, so if a given server has many databases, it may not be the best approach. To further highlight the options and benefits of log shipping, let s walk through an implementation using the SQL Server Management Studio tool.

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You establish a log shipping session in SQL Server Management Studio by right-clicking a database and choosing Tasks > Ship Transaction Logs. Note that the selected database must be using either the Full or Bulk_Logged recovery model. As shown in figure 11.3, the resulting screen provides the option Enable this as a primary database in a log shipping configuration. If the database is already log shipped, you can deselect this option to remove log shipping from the database. After choosing the option to enable the database for log shipping, click the Backup Settings button. In the resulting screen, shown in figure 11.4, you can set a number of properties, such as the transaction log backup destination (including a file share accessible from the log shipping destination server), the log backup retention period, the backup frequency, and whether to use backup compression.

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Figure 11.3 The initial log shipping configuration screen permits access to the various configuration components, including backup settings and secondary servers.

Figure 11.4 The Transaction Log Backup Settings screen enables the configuration of log backup frequency, destination, and retention period.

It s not always fun at the top, as Carly Fiorina, CEO of Hewlett-Packard, found out in 2001 after major restructuring in the company Fiorina was hired away from Lucent Technologies in July 1999 for a pay package valued at $90 million; the value of the package dropped to $38 million by May 17, 2001, as a result of the downturn in the economy and the company s recent performance A recent survey of 8,000 angry HP workers cites poor communication, sloppy execution, and a disconnect between the words and actions of top management

Figure 11.5 On the Initialize Secondary Database tab you can specify how the log shipped database will be created on the destination server.

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