Logging Level Under Different Conditions in .NET framework

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Table 10-1 Logging Level Under Different Conditions
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Clustered Index Yes Table Empty Has Data Minimal Full No Minimal Minimal
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Nonclustered Indexes Yes Minimal Index No Minimal Minimal
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Note that the table population and indexing criteria are applied at the batch level, not the load level. Therefore, if you load 100,000 rows in 10 batches with 10,000 rows per batch into an empty table with a clustered index, SQL Server logs the first 10,000 rows minimally and fully logs the remaining rows (90,000).
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Why is it useful to switch the recovery mode to Bulk-Logged before bulkloading data Switching logging modes from Full to Bulk-Logged lets the database possibly perform minimal logging during the data load. Data that is loaded during a bulk load usually has no need for the point-in-time recovery capability of the Full recovery model. Decreasing the volume of log writes improves performance and helps alleviate the log bloat that occurs during bulk loads.
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It is important to performance that you complete the bulk load during a maintenance window. The obvious reason is so that the bulk load won t have to contend with users for server resources. But the less obvious reasons are that the bulk load can use a table lock, and the recovery model can be altered. The load operation can acquire a table lock instead of the more granular locks that it would acquire otherwise. A table lock is not only more efficient, it is also required for minimal logging to occur. Additionally, most databases operate using the Full recovery model during normal usage. Therefore, if you perform the bulk load during a maintenance window, you can switch the database to the Bulk-Logged recovery model. Although you can switch the database to the Bulk-Logged recovery model during normal usage, certain recovery capabilities are lost, such as point-in-time recovery. To switch to the Bulk-Logged recovery model,
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use either the ALTER DATABASE Transact-SQL command or SQL Server Management Studio (SSMS). An example of using ALTER DATABASE to set the recovery model to Bulk-Logged follows:
ALTER DATABASE AdventureWorks SET RECOVERY BULK_LOGGED;
After you complete the bulk loads, you should switch the database back to the Full recovery model and immediately perform a transaction log backup. Doing so reenables point-in-time recovery from the time of the log backup forward. This log backup not only stores the minimal logging that occurred during the bulk load but also places a copy of the bulk-loaded data into the log backup. This distinction is important because the log backup needs access to the log files and the data files that were the destination of the bulk load. Starting a log backup while a bulk load is occurring to the same data file might introduce contention, which causes both operations to occur more slowly than they would separately. Therefore, it is usually wise to wait until you have finished the bulk loads and placed the database back into Full recovery mode before starting the log backup.
SQL Server Recovery Models
SQL Server provides three recovery models: Full, Bulk-Logged, and Simple. For the most part, the recovery model affects the way SQL Server uses and manages a database s transaction log. The Full recovery model records every change caused by every transaction at a granular level, which allows for point-in-time recovery. You must back up the transaction log to allow SQL Server to reuse log space. The Bulk-Logged recovery model is similar to the Full recovery model, but varies when you bulk load data. If certain conditions are met, the Bulk-Logged recovery model does not record the row inserts at a granular level; instead, it logs only extent allocations, which saves a significant amount of log space. Like the Full recovery model, you must perform a transaction log backup for SQL Server to reuse log space. The Simple recovery model is the same as Bulk-Logged, except that you do not need to back up the transaction log for space to be cleared and reused. Therefore, when using the Simple recovery model, transaction log backups are unreliable. For more information about recovery models, see 2, Configuring SQL Server 2005.
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