Media Recovery

• Assumption: Media recovery required at the level of a file or some such (like DBspace, tablespace etc.) entity.
• A fuzzy image copy (also called a fuzzy archive dump) operation involving such an entity can be performed concurrently with modifications to the entity by other transactions.
• With such a high concurrency image copy method, the image copy might contain some uncommitted updates.
• However, if desired, an image copy with no uncommitted updates could be easily produced.
• Image copying directly from the nonvolatile storage version of the object would usually be much more efficient since the device geometry can be exploited during such a copy operation and since the BM overheads will be eliminated.

• Fuzzy image copying
• Media recovery in action