Concurrency Control
Approaches to concurrency control:
- Lock-based
- Synchronise tx execution via locks on relevant part of DB.
- Version-based (multi-version concurrency control)
- Allow multiple consistent versions of the data to exist.
Each tx has access only to version existing at start of tx.
- Validation-based (optimistic concurrency control)
- Execute all tx's; check for validity problems on commit.
- Timestamp-based
- Organise tx execution via timestamps assigned to actions.
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