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Generator EAN / UCC - 13 in Visual C# Part III

Part III
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eliminating the need for a backup of the production database. This is a costly solution, but it is beneficial for very large, critical databases. Important SQL Server 2005 does not allow you to back up a mirror database (the mirror copy in a database mirroring scenario) because it is not in a recovered state, nor does it allow backing up any kind of SQL Server database snapshot. This capability may be an enhancement in a future release of SQL Server. As of the writing of this book, SQL Server 2005 does not allow taking a backup of a mirror database because it is in a state of no recovery. A database must be in a recovered, online state in order to be backed up. A database snapshot, or SQL Server snapshot, can be taken of a mirror database. Such a snapshot can be accessed only in a read-only manner, such as for reporting, but like a mirror database, database snapshots cannot be backed up. Generally, backups should be performed regularly and frequently for all critical databases that allow data modifications. The more often modifications are made and the more critical the data, the more frequently backups should occur. Less critical databases, such as development and test systems, may need to be backed up only occasionally or not at all. A clear plan for backing up all user databases and pertinent SQL Server system databases (discussed in the next section) should be developed.
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Real World
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Although there are many options for backup strategies and types of backups that can be taken, the majority of cases are well suited to a simple strategy that is easy to restore from. The following is an example of such a common backup strategy for backing up critical user databases. 1. Perform a full database backup every Saturday night 2. Perform a differential database backup every Wednesday night 3. Perform continual transaction log backups every 30 minutes This can be scheduled to run automatically using the Database Maintenance Plan Wizard.
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The Real World example shows a common backup strategy scenario, and specific days and times may vary. Such a schedule is very beneficial because it is simple to implement,
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14
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Backup Fundamentals
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understand, and restore from. However, if your database is very big or if user activity requires continuous uptime and optimal performance, this schedule may not be possible. File or filegroup backups may be necessary in these cases, although administration complexity is increased. Here is a sample strategy for backing up a very large database, assuming it has only two filegroups (Filegroup1, the primary filegroup, and Filegroup2, a secondary filegroup): 1. Full filegroup backup of Filegroup1 on Saturday night (provides the base) 2. Full filegroup backup of Filegroup2 on Sunday night (provides the base) 3. Differential filegroup backup of Filegroup1 on Tuesday night 4. Differential filegroup backup of Filegroup2 on Wednesday night 5. Differential filegroup backup of Filegroup1 on Thursday night 6. Differential filegroup backup of Filegroup2 on Friday night 7. Continual transaction log backups every 30 minutes This backup plan allows recovery of the database by following these steps: 1. Restore the two filegroup base backups (from steps 1 and 2 above). 2. Restore the most recent differential backup of Filegroup1 (from step 5 above). 3. Restore the transaction logs backups taken since Filegroup1 differential backup. 4. Restore the most recent differential backup of Filegroup2 (from step 6 above). 5. Restore the transaction log backups taken since Filegroup2 differential backup. The differential backups from steps 3 and 4 do not need to be restored because all of the changes since the base backup are incorporated into the most recent differential backup. Nor do any log backups taken before the most recent file differential backups need to be restored. Taking differential backups reduces the number of transaction log backups that must be restored. A common and easy way to set up straight-forward SQL Server backups is to use the Database Maintenance Plan Wizard in SQL Server Management Studio. See 17 for details on how to set up database maintenance plans. Important
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You absolutely should test restoring from your backups (onto a test system) to verify your backup and restore strategy work as expected. Perform these restore tests regulary, such as every few months or more often.
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