What Is a Data Lock

Q

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

✍: FYIcenter.com

A

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.

2007-04-17, 4775👍, 0💬