Multi-version concurrency control method and system based on virtual global clock synchronization
A technology of global clock and control method, applied in database distribution/replication, database design/maintenance, special data processing applications, etc.
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[0064] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0065] A multi-version concurrency control method based on virtual global clock synchronization, including the following steps:
[0066] Step 1: Data reading;
[0067] According to the needs of the current transaction, the accessed tuple is copied, and the data value of the related tuple and the current read and write timestamp are atomically read.
[0068] In one embodiment of the present invention, specifically include:
[0069] Step 101: transaction application lock;
[0070] Step 102: Maintain a separate read set and write set for the current transaction, and the encoding format of each entry in the read or write set is {tuple, data, write timestamp, read timestamp}, where, element Group is a pointer to a tuple in the datab...
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