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CONSTRAINT PKLists PRIMARY KEY (HomeNo), CONSTRAINT FKAgentld FOREIGN KEY (Agentld) REFERENCES Agent, CONSTRAINT FKHomeNo FOREIGN KEY (HomeNo) REFERENCES Home )

DB-25 DB-37

When a detection algorithm determines that a deadlock exists, the system must recover from the deadlock The most common solution is to roll back one or more transactions to break the deadlock Three actions need to be taken: 1 Selection of a victim Given a set of deadlocked transactions, we must determine which transaction (or transactions) to roll back to break the deadlock We should roll back those transactions that will incur the minimum cost Unfortunately, the term minimum cost is not a precise one Many factors may determine the cost of a rollback, including a How long the transaction has computed, and how much longer the transaction will compute before it completes its designated task b How many data items the transaction has used c How many more data items the transaction needs for it to complete d How many transactions will be involved in the rollback 2 Rollback Once we have decided that a particular transaction must be rolled back, we must determine how far this transaction should be rolled back The simplest solution is a total rollback: Abort the transaction and then restart it However, it is more effective to roll back the transaction only as far as necessary to break the deadlock Such partial rollback requires the system to maintain additional information about the state of all the running transactions Speci cally, the sequence of lock requests/grants and updates performed by the transaction needs to be recorded The deadlock detection mechanism should decide which locks the selected transaction needs to release in order to break the deadlock The selected transaction must be rolled back to the point where it obtained the rst of these locks, undoing all actions it took after that point The recovery mechanism must be capable of performing such

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The McGraw Hill Companies, 2001

16

The approach to convert generalization hierarchies mimics the entity relationship notation as m u c h as possible Rule 6 converts each entity type o f a generalization hierarchy into a table The only column appearing that are different from attributes in the associated E R D is the in herited primary key In Figure 627, EmpNo SalaryEmp and HourlyEmp is a column in the SalaryEmp and HourlyEmp ta bles because it is the primary key o f the parent entity type (Employee) In addition, the Employee

DB-60 DB-60 DB-60

partial rollbacks Furthermore, the transactions must be capable of resuming execution after a partial rollback See the bibliographical notes for relevant references 3 Starvation In a system where the selection of victims is based primarily on cost factors, it may happen that the same transaction is always picked as a victim As a result, this transaction never completes its designated task, thus there is starvation We must ensure that transaction can be picked as a victim only a (small) nite number of times The most common solution is to include the number of rollbacks in the cost factor

Until now, we have restricted our attention to read and write operations This restriction limits transactions to data items already in the database Some transactions require not only access to existing data items, but also the ability to create new data items Others require the ability to delete data items To examine how such transactions affect concurrency control, we introduce these additional operations: delete(Q) deletes data item Q from the database insert(Q) inserts a new data item Q into the database and assigns Q an initial value An attempt by a transaction Ti to perform a read(Q) operation after Q has been deleted results in a logical error in Ti Likewise, an attempt by a transaction Ti to perform a read(Q) operation before Q has been inserted results in a logical error in Ti It is also a logical error to attempt to delete a nonexistent data item

DB-15 DB-15 DB-25

After converting an E R D to relational tables, your work is not yet finished You need to analyze the tables for redundancies that can make the tables difficult to use This section describes why redundancies can make a table difficult to use and presents an important kind o f constraint to analyze redundancies

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