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Define the structure of a log record as a variant record in PASCAL or C .Use the type of log record (begin_transaction ,undo_redo,commit,abort,global_commit,global_abort,prepare,ready,complete,and checkpoint) as the tag field of the Pascal record (or in similar structure in C language).For the definition of the undo_redo log record ,assume that all database tuples have the same length and that they have an unique identifier of the type integer. °ÝÍи÷λ´óÏÀ°ïæһÏÂÁË¡«Ð»Ð» |
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