Process model and resource management in a distributed database

摘要

A deadlock-free resource management for a homogeneous distributed database system is proposed. Consistent database access is guaranteed in sections called transactions. Transactions consist of several processes of hierarchical structure. Transactions with read-and write-operations use a two-phase locking. The read-resources are locked as they are needed. The write-operations are buffered and executed at the end of a transaction. At this point the write-resources can be locked in a given order. Transactions which only read the database, do not lock the resources. It is only checked if these transactions can be serialized. Conflicts are resolved by resetting of transactions. No expensive recovery is needed. No physical controlling centre is used.