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IBM Data and AI Ideas Portal for Customers


This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


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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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BLU Acceleration

Showing 33 of 15558

Option to avoid sampling for the distribution statistics without creating an index

Because of a misleading distribution statistic the Db2 optimizer can in some situations choose a very bad execution plan.The reason for this is, that Db2 internally samples data to faster create his distribution statistics. To create an index to a...
about 1 month ago in Db2 / BLU Acceleration 0 Submitted

Include CTQ reason / details in db2exfmt advanced diagnostics

We need an "Extended Diagnostic Information" in Explain (db2exfmt) that details if and why the column organized tables had been (early) converted to the row format for processing it in the row engine. This is important to detect performance issues...
about 2 years ago in Db2 / BLU Acceleration 3 Not under consideration

Table partitioning for column-organized tables

Column-organized tables are currently not supported for table partitioning (e.g. PARTITION BY RANGE)..At the same time, table partitioning is used by many data warehouse customers to speed up ETL activities - e.g.:(a) load new data into a separate...
over 7 years ago in Db2 / BLU Acceleration 0 Future consideration

Db2 TOTAL_CPU_TIME monitoring metric on AIX should reflect "wall" CPU time and not use PURR-scaled time reported currently by thread_cputime AIX API

Db2 monitoring interfaces report "CPU time" metric (TOTAL_CPU_TIME), which accounts the time that given activity/request (and all higher level aggregated interfaces) spent actively "on CPU" whilst executing the query. On AIX this information is ob...
over 1 year ago in Db2 / BLU Acceleration 0 Future consideration

BLU CDE Online REORG

Currently BLU CDE tables only have the RECLAIM EXTENTS option of REORG enabled. This does not physically move rows and therefore REORG cannot reclaim extents unless 100% of the rows in an extent have been deleted (via deletes or BLU updates). Also...
almost 9 years ago in Db2 / BLU Acceleration / Tables/Index (Range MQ MDC etc.) 5 Future consideration

Allow EBCDIC collation for column organize tables

Db2 does not support anh collation other than IDENTITY or IDENTITY_16BIT per this link - https://www.ibm.com/docs/en/db2/11.5?topic=to-restrictions-limitations-unsupported-database-configurations-column-organized-tables. Customers who are wanting ...
over 1 year ago in Db2 / BLU Acceleration 0 Future consideration

Rebuild BLU columnar dictionaries and recompress data in BLU columnar tables

An engineered capability is required to automatically rebuild an optimal BLU columnar compression dictionary and recompress BLU columnar tables. A technique is needed to easily rebuild and recompress columnar tables like we have for adaptive compr...
over 1 year ago in Db2 / BLU Acceleration 0 Future consideration

Db2 Warehouse Need support for columnar tables when case insensitivity is configured

System: IBM Integrated Analytics SystemActor: Customer requiring capability My customer is migrating from Teradata to Db2 Warehouse (IIAS appliance). The appliance has been configured for Row-organized tables because case insensitivity is required...
about 6 years ago in Db2 / BLU Acceleration 0 Not under consideration

Full STMM support for BLU

Today SORTHEAP and SHEAPTHRES_SHR need to be set to a fixed value to run BLU.The STMM tuned adjustment don't need to be highly sophisticated. E.g. keeping 60/40 ratio for bufferpool/sheapthres_shr and adjust sortheap as ratio taking the amount of ...
over 6 years ago in Db2 / BLU Acceleration 0 Not under consideration

ALTER TABLE DROP COLUMN for BLU tables

ALTER TABLE DROP COLUMN is not yet supported on BLU tables.
over 6 years ago in Db2 / BLU Acceleration 1 Planned for future release