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to another is accomplished by matching pairs of debit and credit entries, manual correction of a damaged database is simpli ed When the accounting entries are further properly identi ed with the name of the originator and the number of the transaction, a deadlock recovery system can present the request for correction in a simple form Automatic correction (without rollback) may be possible but is not advisable since no adequate audit of data entry exists when transactions are not properly completed 13-2-5 Techniques The e ort to avoid or detect deadlock can be signi cant The time is a ected by the number of transactions and the number of objects being locked If both are small, a (transaction object) matrix can describe the locking pattern The matrix elements need only one or two bits (allocated, or claimed and allocated) For claims to resource classes, integers to denote the number claimed and received will be needed If there are many objects (locking units are small: blocks or records), a static matrix becomes infeasible and dynamic lists have to be managed The better algorithms to detect deadlock, for instance, the bankers algorithm of Example 13-6, require on the order of (#transactions #objects) operations In addition, all claims, allocations, and releases have to be noted If the probability of deadlock is low, it may be feasible to test for deadlock only periodically This may allow the deadlock to spread as other transactions attempt to use the blocked regions It is important that the deadlock checking algorithm itself does not need to claim resources which might be blocked Transaction-oriented systems tend to mimimize potential interference by keeping the number of active transactions small A high priority is assigned to transactions which hold resources so that they will leave the system as fast as possible Two lists are adequate for deadlock detection, one to keep track of objects and one to record the state of each transaction For each active transaction there is an entry in the lexically ordered object list If an object when requested is found already in the list, and the owning transaction is blocked, there is a possibility of deadlock and the test for circularity is made 13-2-6 Deadlock Management in Distributed Databases Deadlock involving multiple nodes of distributed system can occur when transactions lock resources at multiple nodes A deadlock in a distributed system can be localized to a single node Subtransactions created by a remote transaction can be involved in a local deadlock Except for the fact that the cost of aborting a subtransaction can be hard to evaluate and may well be high, the methods for handling local deadlocks remain unchanged In this section we consider deadlocks involving multiple nodes The four principles of deadlock creation and resolution apply also when the deadlock involves more than one node The risk and the cost of deadlock can be greater because the communication times increase the interval that resources may have to be held The notion that a remote user can claim and block local computations is also in con ict with the concept of distributed authority and responsibility.

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