Review: The ACID properties
 | A tomicity: All actions in the Xact happen, or none happen.
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| C onsistency: If each Xact is consistent, and the DB starts consistent, it ends up consistent.
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| I solation: Execution of one Xact is isolated from that of other Xacts.
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| D urability: If a Xact commits, its effects persist.
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| The Recovery Manager guarantees Atomicity & Durability.
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