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WRITETEXT and UPDATETEXT statements when inserting or appending new data into LOB data columns (text, ntext, or image).
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Minimal logging is not used in these cases when existing data is updated.
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CREATE INDEX, including indexes on views ALTER INDEX REBUILD or DBCC DBREINDEX DROP INDEX. The creation of the new heap is minimally logged, but the page deallocation is always fully logged.
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When you execute one of these bulk operations, SQL Server logs only the fact that the operation occurred and information about space allocations. Every data le in a SQL Server 2008 database has at least one special page called a Bulk Changed Map (BCM) page, or also called a Minimally Logged Map (ML Map) page, which is managed much like the GAM and SGAM pages that I discussed in 3 and the DCM pages that I mentioned previously. Each bit on a BCM page represents an extent, and if the bit is 1, it means that this extent has been changed by a minimally logged bulk operation since the last transaction log backup. A BCM page is located on the eighth page of every data le and every 511,230 pages thereafter. All the bits on a BCM page are reset to 0 every time a log backup occurs. Because of the ability to minimally log bulk operations, the operations themselves can potentially be carried out much faster than in FULL recovery mode. However, the speed improvement is not guaranteed. The only guarantee with minimally logged operations is that the log itself is smaller. Minimal logging might actually be slower than fully logged operations in certain cases. Although there are not as many log records to write, with minimal logging SQL Server forces the data pages to be ushed to disk before the transaction commits. This forced ushing of the data pages can be very expensive, especially when the I/O for these pages is random. You can contrast this to full logging, which is always sequential I/O. If you don t have a fast I/O subsystem, it can become very noticeable that minimal logging is slower than full logging. In general, minimal logging does not mean no logging, and it doesn t minimize logging for all operations. It is a feature that minimizes the amount of logging for the operations described previously, and if you have a high-performance I/O subsystem, performance likely improves as well. But on lower-end machines, minimally logged operations are slower than fully logged operations. If your database is in BULK_LOGGED mode and you have not actually performed any bulk operations, you can restore your database to any point in time or to a named log mark because the log contains a full sequential record of all changes to your database. The trade-off to having a smaller log comes during the backing up of the log. In addition to copying the contents of the transaction log to the backup media, SQL Server scans the BCM
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pages and backs up all the modi ed extents along with the transaction log itself. The log le itself stays small, but the backup of the log can be many times larger. So the log backup takes more time and might take up a lot more space than in FULL recovery mode. The time it takes to restore a log backup made in BULK_LOGGED recovery mode is similar to the time it takes to restore a log backup made in FULL recovery mode. The operations don t have to be redone; all the information necessary to recover all data and index structures is available in the log backup.
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The SIMPLE recovery model offers the simplest backup-and-restore strategy. Your transaction log is truncated whenever a checkpoint occurs, which happens at regular, frequent intervals. Therefore, the only types of backups that can be made are those that don t require log backups. These types of backups are full database backups, differential backups, partial full and differential backups, and legroup backups for read-only legroups. You get an error if you try to back up the log while in SIMPLE recovery mode. Because the log is not needed for backup purposes, sections of it can be reused as soon as all the transactions that it contains are committed or rolled back, and the transactions are no longer needed for recovery from server or transaction failure. In fact, as soon as you change your database to SIMPLE recovery model, the log is truncated. Keep in mind that SIMPLE logging does not mean no logging. What s simple is your backup strategy, because you never need to worry about log backups. However, all operations are logged in SIMPLE mode, even though some operations may have fewer log records in that mode than in FULL mode. A log for a database in SIMPLE mode might not grow as much as a database in FULL mode because the bulk operations discussed earlier in this chapter also are minimally logged in SIMPLE mode. This does not mean you don t have to worry about the size of the log in SIMPLE mode. As in any recovery mode, log records for active transactions cannot be truncated, and neither can log records for any transaction that started after the oldest open transaction. So if you have large or long-running transactions, you still might need lots of log space.
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