Massive Concurrent Deletion of Keys in B*-Tree
B*-tree is an improved variant of well known B-tree data structure which has extensive applications in data storage and retrieval systems including parallel database systems. In this paper, we present an algorithm for deleting keys of B*-tree concurrently in the case that the number of to-be-deleted keys is more than a half of the total keys in the tree. The proposed algorithm can be implemented on CREW PRAM model in optimal O(log2n + BlogBn) time with the total processors equal to the keys to be deleted. n is the total number of keys in B*-tree and B is equal to half of the keys in an internal node containing maximum keys. It counts as an improvement upon the previous comparable known algorithms by a reduction of factor B in the (log2n)-term of the time complexity.
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