DIFFERENCE BETWEEN THE FULL AND BULK-LOGGED RECOVERY MODEL

DIFFERENCE  BETWEEN THE  FULL AND BULK-LOGGED  RECOVERY MODEL 

In bulk logged recovery mode certain bulk operations are minimally logged. In FULL recovery mode these are fully logged. These bulk operations are as mentioned below
1. SELECT INTO
2. BULK IMport operations including BULK INSERT and BCP
3. INSERT INTO SELECT command using the OPENROWSET(BULK) function
4. Partial updates to columns having large value data type
5. Using WRITE clause in UPDATE statements
6. Index operations e.g CREATE INDEX, ALTER INDEX REBUILD , DROP INDEX
In Bulk Logged Recovery Mode when you execute these operations SQL Server only logs the fact that these operation occured and information about space allocation. The actual change in the data is maintained in the BCM (Bulk
Changed Map)
Since the actual changes are not recorded in the log file, the log file size in the reletively less in size but this tradeoff comes with the price of increased backup time. This is so because during the log backup its not just the log being backup, but also
the extents that are marked by the Bulk Changed Map as changed.
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