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Optimistic concurrency control (OCC), also known as optimistic locking, is a non-locking concurrency control method applied to transactional systems such as relational database management systems and software transactional memory. OCC assumes that multiple transactions can frequently complete without interfering with each other.
The two types of locking are pessimistic locking and optimistic locking: Pessimistic locking: a user who reads a record with the intention of updating it places an exclusive lock on the record to prevent other users from manipulating it. This means no one else can manipulate that record until the user releases the lock.
The most common mechanism type in database systems since their early days in the 1970s has been Strong strict Two-phase locking (SS2PL; also called Rigorous scheduling or Rigorous 2PL) which is a special case (variant) of Two-phase locking (2PL). It is pessimistic.
Record locking is the technique of preventing simultaneous access to data in a database, to prevent inconsistent results. The classic example is demonstrated by two bank clerks attempting to update the same bank account for two different transactions.
Meta CEO Mark Zuckerberg is among the world’s wealthiest individuals, with a net worth topping $100 billion. While a number of factors explain his success, one might simply be his optimistic nature.
Timestamp locking [ edit ] Even though this technique is a non-locking one, in as much as the object is not locked from concurrent access for the duration of a transaction, the act of recording each timestamp against the Object requires an extremely short duration lock on the Object or its proxy.
This is the perfect example of the optimistic vs. pessimistic explanatory styles. 8. "Perception of my life, and not my circumstances, determines my happiness." Circumstances come and go. Some are ...
A new study from Michigan State University says that there's a physical, biological difference in the brains of optimists and pessimists. The study took 71 female participants and pre-screened ...