A New Approach to Concurrency Control in XML Databases

One of the most important features of a database in a multi-user environment is its concurrency control mechanism. The existing protocols either provide a restricted concurrency level which is less than what logically could be or provide a high level of concurrency which may lead to some defects. To overcome these problems, we offer a novel locking protocol with some rich locks named "XML Path Locking by Child Consideration" (XPLC). In our approach unlike the existing ones, we consider the child of the node which we want to lock. Also our locks have different granularities according to their types.