Transaction concurrency control model.  
 More...
#include <transaction_consts.h>
Transaction concurrency control model. 
◆ Type
| Enumerator | 
|---|
| OPTIMISTIC | Optimistic concurrency model.  In this mode all cache operations are not distributed to other nodes until Transaction::Commit() is called. In this mode one 'PREPARE'message will be sent to participating cache nodes to start acquiring per-transaction locks, and once all nodes reply'OK', a one-way'COMMIT'message is sent without waiting for reply. Note that in this mode, optimistic failures are only possible in conjunction with ::IGNITE_TX_ISOLATION_SERIALIZABLE isolation level. In all other cases, optimistic transactions will never fail optimistically and will always be identically ordered on all participating grid nodes.  | 
| PESSIMISTIC | Pessimistic concurrency model.  In this mode a lock is acquired on all cache operations with exception of read operations in ::IGNITE_TX_ISOLATION_READ_COMMITTED mode. All optional filters passed into cache operations will be evaluated after successful lock acquisition. Whenever Transaction::Commit() is called, a single one-way 'COMMIT'message is sent to participating cache nodes without waiting for reply. Note that there is no reason for distributed'PREPARE'step, as all locks have been already acquired. | 
 
 
The documentation for this struct was generated from the following file: