Basic Oracle Concepts and Programming Question:
How Data Locks Are Respected in Oracle?
Answer:
Here are the rules on how data locks are respected:
► All statements ignore data locks owned its own transaction.
► SELECT query statements ignores data locks owned by any transactions.
► INSERT, UPDATE, and DELETE statements in a READ COMMITTED transaction will wait for data locks on their targeted rows by other transactions to be released.
► INSERT, UPDATE, and DELETE statements in a SERIALIZABLE transaction will fail if their targeted rows has data locks owned by other transactions.
► All statements ignore data locks owned its own transaction.
► SELECT query statements ignores data locks owned by any transactions.
► INSERT, UPDATE, and DELETE statements in a READ COMMITTED transaction will wait for data locks on their targeted rows by other transactions to be released.
► INSERT, UPDATE, and DELETE statements in a SERIALIZABLE transaction will fail if their targeted rows has data locks owned by other transactions.
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