Oracle Database Interview Question:

How Data Locks Are Respected in Oracle?

Submitted by: Administrator

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.

Submitted by: Administrator