Page History

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To store an additional 8 bytes partition meta shifted by 8 bytes.To support binary compatibility and keep code clean we creating a new successor of PageMetaIO - PageIndexMetaIO with the new type T_INDEX_META.

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• Background re-encryption may affect performance. Performance impact can be managed using the following configuration options:
  1. reencryptionThreadCnt - number of threads used for re-encryption.
     
  2. reencryptionBatchSize - number of pages that are scanned during re-encryption under checkpoint lock.
     
  3. reencryptionRateLimit - page scanning speed limit in megabytes per second.
     
  4. reencryptionThreadCnt - number of threads used for re-encryption(?).
• The WAL history can be not enough to store all entries between checkpoints (this should be carefully tuned by properly setting the size of the WAL history and tuning the re-encryption performance).
• The WAL history (for delta rebalancing) may be lost for all cache groups due to background re-encryption.

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