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Is there any conceptual difference between a SERIALIZABLE Transaction and a Flashback Query?

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They are completely unrelated concepts.

  • Serializable is a type of isolation level (read here for more info)
  • Flashback Query is an Oracle technology for getting querying data as it was at a certain point in time - for example, if certain conditions are met you can use Flashback Query to get those million rows back after committing that transaction that accidentally deleted them.

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