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Oracle Tutorials - General Rules on Data Consistency

By: FYIcenter.com

(Continued from previous topic...)

What Are the General Rules on Data Consistency?

Here is a list of general rules on data consistency:

  • All SQL statements always work with a snapshot of the database to provide data consistency.
  • For READ WRITE transactions, the snapshot is taken when each statement starts.
  • For READ ONLY transactions, the snapshot is taken when the transaction starts.
  • The snapshot never include uncommitted changes from other transactions.
  • The snapshot always include uncommitted changes from its own transaction.

(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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