How Does Multi-Version Concurrency Control (MVCC) in DBMS Works?
- In the database, every tuple has a version number. The tuple with the greatest version number can have a read operation done on it simultaneously.
- Only a copy of the record may be used for writing operations.
- While the copy is being updated concurrently, the user may still view the previous version.
- The version number is increased upon successful completion of the writing process.
- The upgraded version is now used for every new record operation and every time there is an update, this cycle is repeated.
What is Multi-Version Concurrency Control (MVCC) in DBMS?
Multi-Version Concurrency Control (MVCC) is a database optimization method, that makes redundant copies of records to allow for safe concurrent reading and updating of data. DBMS reads and writes are not blocked by one another while using MVCC. A technique called concurrency control keeps concurrent processes running to avoid read/write conflicts or other irregularities in a database.
Whenever it has to be updated rather than replacing the old one with the new information an MVCC database generates a newer version of the data item.
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