Quote: a transaction-time database answers time-slice queries concerning the state of the database at a particular time

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Transaction times [when a transaction executes] and timestamping facilitate … [a] form of multiversion database called a transaction-time … Such databases support time-slice queries that ask to … A current version of data becomes a historical … Historical versions of data are never updated, and … [ref].   Google-1   Google-2

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Quote: historical versions of a transaction-time database are never modified; store on WORM optical disk

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