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How to avoid Deadlocks ? More DBA job interview questions and answers at
http://dba.fyicenter.com/Interview-Questions/
(Continued from previous question...) How to avoid Deadlocks ?
Using both row-level locking and the TRANSACTION_READ_COMMITTED isolation level makes it likely that you will avoid deadlocks (both settings are Derby defaults). However, deadlocks are still possible. Derby application developers can avoid deadlocks by using consistent application logic; for example, transactions that access Accounts and Orders should always access the tables in the same order. That way, in the scenario described above, Transaction B simply waits for transaction A to release the lock on Orders before it begins. When transaction A releases the lock on Orders, Transaction B can proceed freely.
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Other Job Interview Questions
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