Acording to the text, ROLLBACK is an operation that

The expression "which either completes completely or not at all" , underlined in the text, means

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Every organization trusts in computer and information technology to better operate.

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Well-trained employees has no longer been required to work with technological advances.

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New tasks demanded by new technologies are already known by workers.

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Computer systems analysts must be able to deal with the specific needs of an organization as far as its computer problems are concerned.

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Systems analysts cannot apply existing systems resources to further operations.

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What is Wikipedia?

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When was the Wikipedia launched?