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Compression of Primary Key Indexes with Version 10.1 FP 5

While doing some testing with, we noticed that when you create a table compressed, that ALL indexes automatically get compressed. We found out that we have the ability to specify "normal" indexes without compression, but you can not have an uncompressed Primary Key. We noticed some degradation on loading the table with indexes and Primary Keys compressed.

As a work around, we dropped and recreated all indexes without compression, then created a Unique Index and tied it to a primary key constraint.

We were wondering if IBM would consider an enhancement of allowing primary key uncompressed.
  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Jan 3 2019
  • Will not implement
Idea Priority Low
Customer Name Ameriprise
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  • Admin
    Karthik Gopalakrishnan commented
    1 Apr, 2019 04:12pm


    As per discussion with Development (Matt Emmerton), we decided to reject this Idea/RFE due to following reason. If you would like re-open or get more details on this Idea, please reply as public comment. 

    Reason for rejecting this Idea/RFE:

    There are many properties of indexes that are allowed in a CREATE INDEX statement that are not allowed as part of a CREATE TABLE ... PRIMARY KEY or ALTER TABLE ADD PRIMARY KEY statement.
    In these situations, the CREATE TABLE ... PRIMARY KEY statement must be decomposed into separate CREATE TABLE, CREATE INDEX and ALTER TABLE operations.
    This is the solution that you have devised to support the combination of a compressed table with an uncompressed primary key index.

    While we agree that it would be beneficial to achieve this effect via a single CREATE TABLE ... PRIMARY KEY statement, it would require extensions to the SQL language syntax which we believe are inappropriate and are unlikely to succeed.


    Karthik Gopalakrishnan
    Advisory Offering Manager, IBM Db2
    Mobile: +1 469 996 6850

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