How parallel hint works on the full table scan?
DBAsupport.com Forums - Powered by vBulletin
Results 1 to 6 of 6

Thread: How parallel hint works on the full table scan?

Hybrid View

  1. #1
    Join Date
    Dec 2005
    Posts
    195

    How parallel hint works on the full table scan?

    I have couple of interview questions. Can any one please through some lights on this.

    1. What are the init parameters to improve the full tablespace in SQL QUERY?

    2. I have table which has huge number of records. Let us say, table has 500 million records. My business logic is forcing me to scan the entire table. I am using PARALLEL hint to get better performance. How the parrellel process works internally? How multiple process works on the same table and join the results?? Since there is only one table and how multiple process hit the same table and join the result?

  2. #2
    Join Date
    Nov 2000
    Location
    greenwich.ct.us
    Posts
    9,092
    1. what is a full tablespace scan?
    2. tahiti.oracle.com
    Jeff Hunter
    marist89@yahoo.com
    http://marist89.blogspot.com/
    Get Firefox!
    "I pledge to stop eating sharks fin soup and will not do so under any circumstances."

  3. #3
    Join Date
    Dec 2005
    Posts
    195
    1. Sorry. It is my tying mistake. It is Full table scan. Not full tablespace.
    2. What is this? tahiti.oracle.com

  4. #4
    Join Date
    Sep 2002
    Location
    England
    Posts
    7,333
    think about partitioning maybe, if you can split it on what you are searching on.

    Full scanning 500 million rows will take a long time - why *MUST* you full scan it and not index the relevant columns?

  5. #5
    Join Date
    Dec 2005
    Posts
    195
    Dav, I am not getting answer for my question.

    1. What are INIT parameters for improving the full tablescan?
    2. How does PARALLEL process works for full tablescan on non partitioned table?

    These two are the interview questions. I am trying to get answer for these.

  6. #6
    Join Date
    Nov 2004
    Location
    Mumbai, India
    Posts
    452
    1.DB Files Multiblock Read Count
    2 Read concepts as suggested by marist
    There are three kinds of lies: Lies, damned lies, and benchmarks...

    Unix is user friendly. It's just very particular about who it's friends are.

    Oracle DBA

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  



Click Here to Expand Forum to Full Width