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Oracle Tutorials - What Is a Dead Lock

By: FYIcenter.com

(Continued from previous topic...)

What Is a Dead Lock?

A dead lock is phenomenon happens between two transactions with each of them holding a lock that blocks the other transaction as shown in the following diagram:

(transaction 1)                (transaction 2)
update row X to create lock 1
                               update row Y to create lock 2
                               update row X
                               (blocked by lock 1)
update row Y
(blocked by lock 2)

(dead lock created)

(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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