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Oracle® Database SQL Language Reference
12c Release 1 (12.1)

E17209-15
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Manual Data Locking

Oracle Database always performs locking automatically to ensure data concurrency, data integrity, and statement-level read consistency. However, you can override the Oracle default locking mechanisms. This can be useful in situations such as the following:

You can override automatic locking at two levels:

Note:

When overriding Oracle default locking, the database administrator or application developer should ensure that data integrity is guaranteed, data concurrency is acceptable, and deadlocks are not possible or, if possible, are appropriately handled. For more information on these criteria, see Oracle Database Concepts.