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Status Not under consideration
Workspace Db2
Created by Guest
Created on Aug 25, 2016

DB2 performance - Hash partition table

On the VLDB - Very Large Database environment.
DB2 should support hash partition table to improve performance especially pureScale environment.
  • Guest
    Apr 10, 2019

    The customer requirement of the following competitor's syntax for a "hash-partitioned" table:

    CREATE TABLE sales_hash
    (
      s_productid NUMBER,
      s_saledate DATE,
      s_custid NUMBER,
      s_totalprice NUMBER
    )
    PARTITION BY HASH(s_productid)
    (
      PARTITION p1 TABLESPACE tbs1,
      PARTITION p2 TABLESPACE tbs2,
      PARTITION p3 TABLESPACE tbs3,
      PARTITION p4 TABLESPACE tbs4
    );

    Can be emulated in Db2 using the following, which has been specifically optimized in Db2 11.1.3.3 (and later):

    CREATE TABLE sales_hash
    (
      s_productid BIGINT,
      s_saledate DATE,
      s_custid BIGINT,
      s_totalprice BIGINT,
      s_genpartkey SMALLINT NOT NULL IMPLICITLY HIDDEN GENERATED ALWAYS AS (MOD(HASH4(CHAR(s_productid)),4))
    )
    PARTITION BY RANGE(s_genpartkey)
    (
      PART p1 STARTING(-3) ENDING(-3) IN tbs4 INDEX IN tbs4,
      PART p2 STARTING(-2) ENDING(-2) IN tbs3 INDEX IN tbs3,
      PART p3 STARTING(-1) ENDING(-1) IN tbs2 INDEX IN tbs2,
      PART p4 STARTING(0)  ENDING(0)  IN tbs1 INDEX IN tbs1,
      PART p5 STARTING(1)  ENDING(1)  IN tbs2 INDEX IN tbs2,
      PART p6 STARTING(2)  ENDING(2)  IN tbs3 INDEX IN tbs3,
      PART p7 STARTING(3)  ENDING(3)  IN tbs4 INDEX IN tbs4
    );