Virtual Immediate Basins of Newton Maps

The present invention relates to a method of handling the risk of a deadlock between simultaneous transactions T1, T2 in a database 1. The method is based on allocating to respective objects 01, 02 in the database 1 a lockout queue L1, L2 in which transactions T1, T2, T3, . . . , T8 that request access to an object 01, 02 are placed to await the access to said object of a preceding transaction. The handling procedure comprises going through, or perusing, the lockout queues L1 belonging to different objects 01 to detect so-called locking transactions T1 that can cause a deadlock and, subsequent to detection, comparing said locking transaction with other transactions T2, T6, T1. T7, T8 in other lockout queues L2 therewith enabling the risk of deadlock between a first and a second transaction T1, T2 that have both requested access to the same first and second object 01, 02 to be detected. Combinations of transactions that are ongoing or active in the database and that, according to said comparison, can cause a deadlock are divided into locking and non-locking combinations respectively. Solely the detection of a locking combination will cause further action to be taken.