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Define the Immediate Update
The immediate update methods may apply changes to the database on disk before the transaction arrives a successful conclusion. Though, these changes are usually recorded in the log on disk by force writing previous to they are applied to the database, making recovery still possible.
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brief history,definition,current trends and future trends if any of data fragmentation
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What is the used of specifying alias? Specifying alias: is used to rename column or attribute in a table.
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