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Quiz on lock and timestamp based protocols, deadlock handling, multiversion schemes, validation based protocols, insert and delete operations.
Concurrency control in a relational database management system (RDBMS) manages operations that happen simultaneously so that they don't conflict with each other. This ensures that data integrity is maintained when updates are made to the database in a multi-user environment
Here are some concurrency control mechanisms: Optimistic concurrency control (OCC): Allows multiple transactions to read and modify the same data without locking or blocking each other, as long as they don't conflict. OCC assumes that conflicts are rare and can be detected and resolved at the end of each transaction. Timestamp-based protocol: Every transaction has a timestamp associated with it, and the ordering is determined by the age of the transaction. For example, a transaction created at 0002 clock time would be older than all other transactions that come after it. Multiversion concurrency control (MVCC): aEvery database record has a version number. Concurrent reads happen against the record with the highest version number.
Related Test: DBMS Basics Practice Test: Concurrency Control
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