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IBM Data and AI Ideas Portal for Customers


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Welcome to the IBM Ideas Portal (https://www.ibm.com/ideas) - Use this site to find out additional information and details about the IBM Ideas process and statuses.

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Status Not under consideration
Workspace Db2
Created by Guest
Created on Nov 29, 2016

Excessive DBHEAP by BLU compression dictionaries

In current design, when SQL statement accesses a table, the compression and expansion dictionaries of that table will be read into DBHEAP and kept there until database deactivation. For column-based table, the memory consumption may up to 100MB. it's worse in DPF + BLU environment due to every related database partition need keep such info in its DBHEAP. So for a system with many tables, the customer either allocates huge memory for DBHEAP, or hits error and restart DB2 database.
Hope to change the DBHEAP management method, let the DBHEAP memory could be reused.
  • Guest
    Reply
    |
    Mar 19, 2024

    There will be problems if the original design is used on a large scale.