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Managing Undo Data (undo data is: (used to support (rollback operations,…
Managing Undo Data
undo data is:
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a copy of original, premodified data
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undo
used for: rollback, read consistency, flashback
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storing undo information
undo information is stored in undo segments, which are stored in an undo tablespace
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require that only one of them be the current writable undo tablespace for a given instance at any given time
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