What are DML locks?

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What are DML locks?

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DML locks are used for locking tables while performing DML operations (INSERT, UPDATE, and DELETE) on them. DML locks ensure that only a single operation is performed on a row at a time. This helps in maintaining data consistency. DML locks are maintained at two levels:

  • Table level
  • Row level
DML locks are implicitly created by Oracle. However, these locks can also be obtained manually. In case the locks are obtained manually, the upper limit is controlled by the DML_LOCKS parameter.


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