In the IndexedAccessmethod, a method of indicating that a record or block is in use and is not available for another request.
在索引存取方法中,指明一个记录或数据块处于使用之中而且不再接受另一个使用请求的一种方法。
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It is interesting that no one pointed out the similarity between FriendFeed's solution and the "ancient" technology of ISAM - Indexed Sequential AccessMethod.