What Is a Data Lock


What Is a Data Lock? - Oracle DBA FAQ - Understanding SQL Transaction Management

✍: FYIcenter.com


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.

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