barcodelib.barcode.rdlc reports.dll 10: Disaster Recovery in .NET

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10: Disaster Recovery
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TIP If point-in-time restores are required, you must use a full recovery model The bulk-logged recovery model does not support restores using STOPAT to recover to a specific point in time if the log backup contains bulk-logged changes A subtlety is that STOPAT can be used if the bulk-logged recovery model is used and the transaction log does not contain any bulk-logged changes
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The Bulk-Logged Recovery Model
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In the bulk-logged recovery model, most transactions are logged into the transaction log Bulk-loads (a bulk import of data via methods such as SSIS packages or bcp scripts) are not recorded line by line, but are instead recorded as a single event The only time the log is truncated is when it is backed up The bulk-logged recovery model would be used when we want the capability to recover our data up to the point of failure, except for bulk-loads Similar to the full recovery model, everything is logged and the complete log is retained between backups However, let s say that at 9 AM every day, we do a bulk import of thousands of lines of data that aren t otherwise modified during the day If we were to use the full recovery model, these thousands of lines would be recorded in the transaction log It could impact the performance of the server during the bulkload, and it could make the transaction log unacceptably large With the recovery model set to bulk-logged, the bulk-load of thousands of lines instead logs only a couple of lines such as bulk-load started and bulk-load ended The method of bulk-load isn t important It could be from a legacy DTS package, an SSIS package, or even using the bcp command-line utility
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Figure 10-7 A disk failure on the drive holding the database after a bulk-load
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Full backup midnight 1 2 3 4 5 6 7 8 INSERT Start Start Start UPDATE Start Commit DELETE Start Commit Commit Commit
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Bulk-load 9 am
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MCITP SQL Server 2005 Database Developer All-in-One Exam Guide
EXAM TIP Any time you want to ensure that a bulk-load event has minimal impact on the transaction log, set the recovery model to bulk-logged What happens if we have a disk crash Take a look at Figure 10-7 It shows a backup last night at midnight, a bulk-load (at 9 AM), and a disk failure at 2 PM The first thing we do is back up the transaction log We can then restore the full backup and the transaction log It gives us everything except the data loaded in at 9 AM We would now repeat the bulk-load, and find ourselves back to where we were before the disk crash So, we use the bulk-logged recovery model to allow recovery up to the moment of failure, but without logging bulk-loaded data
The Simple Recovery Model
In the simple recovery model, only minimal amount of data is logged into the transaction log It s still used for recovery purposes and to ensure the database can survive power failures, but the data in the transaction log is not available to us as database administrators The log is truncated at every checkpoint The simple recovery model would be used when we never need the capability to recover any data other than what was included in the last backup, such as in databases that don t have few changes In early versions of SQL Server, an option called trunc log on chkpt existed Setting this caused the transaction log to be truncated at every checkpoint The simple recovery model replaces this With the simple recovery model selected, the log is continuously being truncated at every checkpoint A benefit is that the database administrator (DBA) doesn t need to manage the transaction log it will not grow out of control, taking over the disk A drawback is that transactions recorded in the transaction log aren t available to be recovered if a disk failure occurs In other recovery models, the only time the transaction log is truncated is during backups All transactions since the last backup are available When we experience a disk failure, we back up the transaction log and have the transactions since the last backup available for the restore This capability is not available in the simple recovery model
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