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  1. #1
    Join Date
    Aug 2005
    Posts
    4

    Unanswered: Partitioned Tablespace ? in LUW 9.5

    I am a DB2 DBA for z/OS, but I have been learning the LUW world lately and I have a question about partitioning. On z/OS partitioning is at the table level, and I can have partitions that are 64GB each, where a non-partitioned tablespace can only be 64GB. I know there is something called database partitioning and range partitioning (table) in LUW but I am trying to find limits on the table partitioning. I know (at least I think I know) the max size on a large tablespace on LUW 9.5 is 16TB, but if I partition it by range does that mean I get 16TB x # of partitions? Or does the database partitioning better relate to the z/OS partitioning? And if anyone what's to play teacher, what would be the reasons to use database partitioning or table/range partitioning?
    Thanks!

  2. #2
    Join Date
    Jan 2009
    Location
    Zoetermeer, Holland
    Posts
    746
    Quote Originally Posted by maday15 View Post
    does that mean I get 16TB x # of partitions?
    Yes. For your other questions: read this DB2 Diary from Radhesh: DB2 Partitioning

  3. #3
    Join Date
    Jun 2003
    Location
    Toronto, Canada
    Posts
    5,516
    Provided Answers: 1
    Maximum tablespace size depends on its page size, so the number will be different for each page size tablespace. There is also a limit on the table partition size. Please refer to the SQL and XML Limits section in the manual. SQL and XML limits

    Briefly, database partitioning (DPF) allows you to parallelize queries and utility execution, while table partitioning is good for data maintenance (archiving etc.) and range-based queries (if they map to the partitioning key, that is).

  4. #4
    Join Date
    May 2003
    Location
    USA
    Posts
    5,737
    Table Partitioning in DB2 LUW is equivilent to Range Partitioning in DB2 z/OS.

    Database partitioning (DPF) is a whole 'nother animal and is used for MPP (Massive Parallel Processing). Data is randomly distributed accross multiple logical (or physical) nodes based on a hash key. The closest thing to DPF is Teradata. DPF requires extra cost licensing over and above DB2 ESE edition. Starting in 9.7 they renamed DPF feature as InfoSphere Warehouse Edition (there are actually several different InfoSphere Warehouse editions such as Basic, Enterprise, etc).
    M. A. Feldman
    IBM Certified DBA on DB2 for Linux, UNIX, and Windows
    IBM Certified DBA on DB2 for z/OS and OS/390

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