Basic Oracle Concepts and Programming Question: Download Questions PDF
What Is a Data Lock in Oracle?
Answer:
A data lock is logical flag the Oracle server is placed on data objects to give an exclusive right to a transaction. Statements in other transactions needs to respect data locks based on certain rules. Rules on data locks are:
► SELECT query statements do not create any data locks.
► INSERT, UPDATE, and DELETE statements create data locks on the affected rows.
► Data locks are released when the owner transaction ends.
► SELECT query statements do not create any data locks.
► INSERT, UPDATE, and DELETE statements create data locks on the affected rows.
► Data locks are released when the owner transaction ends.
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