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Sunday, March 17, 2013

What is the difference between Bulk Load and Normal Load?

  • Bulk loading, improves the performance of a session that inserts a large amount of data to the target database. When bulk loading, the Integration Service bypasses the database log, which speeds performance. Without writing to the database log, however, the target database cannot perform rollback. As a result, you may not be able to perform recovery.In normal load the databse log is not bypassed and therefore the target databse can recover from an incomplete session.
  • Bulk Load: It is preferable when the volume of data is huge from source system. if we select bulk loading, integration service doesn't create Database log, that's the reason we can’t perform session recovery. But bulk loading can improve the performance of session. Normal Load: If we select normal loading, integration service create Database log before loading the data into Target. This database log having the information of last ROW ID of the record for recent load data. it can support session recovery.
  • Normal Load: Normal load option in session properties will load records one-by-one and generate log for the information. Bulk load: It will load all records at a time and did not generate session log for records. When you enable bulk load the IS invokes sql loaders and bypass database log. In normal we can able to recovery session but bulk load cannot recover the session

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