database systems, it is necessary that all sites are numbered, and transactions that require to access
data items from multiple sites must request the corresponding locks by visiting the sites according
to the predefi ned numbers. The priority of a transaction is the highest number among the locks
that are already owned by the transaction. In this method, as a transaction can only wait for those
transactions that have higher priorities, no deadlock situations can occur.
Deadlock avoidance methods are more suitable than deadlock prevention schemes for database
environments, but they require runtime support for ...
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