计算机术语“update by copy”的中英文意思、释义、翻译及用法-计算机英汉双解词典

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术语	update by copy
释义	update by copy 拷贝更新(法) A method of updating a sequential file by merging it with an amendment file and writing the resultant version to a different storage device than the one used to hold the preupdated file. It is performed sequentially with the key of each record in the file being updated checked against the keys of the amendment file to locate matches and keys not included in the sequence. Where no match is found, the record is copied to the new location. Where a match is found, the record in the amendment file is written to the new location. If a record in the amendment file has a key that is not represented in the file being updated, it is written to the new location in its correct sequence. Update by copy has the advantage of retaining the preupdated version, of being able to accommodate variable length records, and providing for easy insertion of “missing” records without the need to leave unused space for them. 一种更新顺序文件的方法.它利用一个修改文件与原顺序文件进行合并，合并的结果并不取代原文件，而是写到另一存储设备上，也就是顺序地使用原文件中的每个记录的键与修改文件中相应的键进行比较，以找出匹配的和没有的键，当两者不同时，将原文件的记录拷贝到新的位置；当两者相同时，则把修改文件中的记录写到新的位置.如果在修改文件中的某一记录键在原文件中没有表示出来，那么就将修改文件中的记录以修改次序写到新的位置.拷贝更新具有保留原文件以及能适当变长记录等优点，并提供了容易插入“丢失”记录的方法，而不需要再为“丢失”的记录保留未使用的空间. 参阅update in situ
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