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`B R O W S E E N C Y C L O P E D I A
`An activity or request. Orders, purchases, payments as well as
`changes, additions and deletions are typical transactions.
`Transactions update one or more master files and serve as both an
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`B R O W S E E N C Y C L O P E D I A
`An activity or request. Orders, purchases, payments as well as
`changes, additions and deletions are typical transactions.
`Transactions update one or more master files and serve as both an
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`audit trail and history for future analyses. Ad hoc queries are a type
`of transaction as well; however, they are usually just acted upon,
`and the query transaction is not saved. Transaction volume is a
`factor in figuring computer system size and speed.
`Keeping Transactions in Sync
`A major problem in a transaction processing system is ensuring
`that all master files are updated before the transaction is
`considered completely processed. For example, if two files must
`be updated, but a system failure occurs after the first one but
`before the second, the software must be able to roll back the first
`update and start over. In a distributed environment, this is called
`"two-phase commit." See
`transaction file, transaction fee and
`crypto transaction.
`
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`Typical Transaction Formats
`The daily transactions in a company reflect the operation of the business.
`Maintenance transactions are processed as required.
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