Abstract: A method and a hybrid distributed database for performing a transaction in a communication network. The distributed data base comprise a pessimistic scheduler for requesting a read/write lock from its associated transaction manager, determining if there is a conflict for the operation and for detecting a conflict of operation. If there is a conflict for the operation, the pessimistic scheduler requests a read/write lock for the transaction until obtaining the read/write lock and if not, the pessimistic scheduler obtains the read/write lock. The distributed database also comprises an optimistic scheduler for determining an operation type, determining if there is a conflict for the operation. If so, the optimistic scheduler determines an operation type until determining that the operation is not in conflict with an operation of another transaction. The pessimistic and optimistic schedulers each access an associated database node for performing the operation for the transaction.