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Oracle Tutorials - How Data Locks Are Respected

By: FYIcenter.com

(Continued from previous topic...)

How Data Locks Are Respected?

Here are the rules on how data locks are respected:

  • All statements ignore data locks owned its own transaction.
  • SELECT query statements ignores data locks owned by any transactions.
  • INSERT, UPDATE, and DELETE statements in a READ COMMITTED transaction will wait for data locks on their targeted rows by other transactions to be released.
  • INSERT, UPDATE, and DELETE statements in a SERIALIZABLE transaction will fail if their targeted rows has data locks owned by other transactions.

(Continued on next topic...)

  1. What Is a Transaction?
  2. How To Start a New Transaction?
  3. How To End the Current Transaction?
  4. How To Create a Test Table for Transaction Testing?
  5. How To Commit the Current Transaction?
  6. How To Rollback the Current Transaction?
  7. What Happens to the Current Transaction If a DDL Statement Is Executed?
  8. What Happens to the Current Transaction If the Session Is Ended?
  9. What Happens to the Current Transaction If the Session Is Killed?
  10. How Does Oracle Handle Read Consistency?
  11. What Is a READ WRITE Transaction?
  12. What Is a READ ONLY Transaction?
  13. How To Set a Transaction To Be READ ONLY?
  14. What Are the Restrictions in a READ ONLY Transaction?
  15. What Are the General Rules on Data Consistency?
  16. What Are Transaction Isolation Levels Supported by Oracle?
  17. What Is a Data Lock?
  18. How Data Locks Are Respected?
  19. How To Experiment a Data Lock?
  20. How To View Existing Locks on the Database?
  21. What Is a Dead Lock?
  22. How Oracle Handles Dead Locks?

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