IBM Data and AI Ideas Portal for Customers


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BLU Acceleration

Showing 33

Add REORG LONGLOBDATA for columnar tables

Currently we can create columnar tables with CLOB/LOB columns in it. What we can't do is reclaim the allocated diskspace of the CLOB/LOB columns (LOB_OBJECT_P_SIZE) in columnar tables To get an idea about how many diskspace is allocated: db2 "...
about 2 years ago in Db2 / BLU Acceleration 0 Future consideration

Support mixed row/column environments without requiring CUR_COMMIT=ON

We have recently run into a problem when we enable Cur_commit because of the locking behavior expected by some applications (they expect blocking). Therefore, we have to disable CC, but then that app cannot use blu. We want to give our plant the a...
about 6 years ago in Db2 / BLU Acceleration / Tables/Index (Range MQ MDC etc.) 0 Planned for future release

Support additional single-byte encodings for column-organized tables

The latest updates to DB2 have added the support of codepage 809 (ISO8859-1) for databases using column-organized tables..This is good for many Western customers, who are able to avoid switching to Unicode (and paying the penalty of 2x or 3x chara...
over 7 years ago in Db2 / BLU Acceleration 0 Not under consideration

Re-build synopsis statistics in BLU

Provide a function to rebuild the synopsis table metadata online/offline to improve query performance.
about 9 years ago in Db2 / BLU Acceleration 1 Not under consideration

Provide SYSTEM / UNIQUE collation sequence support for column organized tables when codepage is 819

The lack of support for anything other than IDENTITY collation sequence for codepage 819 makes migration to BLU very difficult for customers who use it.
over 7 years ago in Db2 / BLU Acceleration 0 Not under consideration

Improve performance of DB2 BLU SQL with the GROUP BY subquery

Our customer newly built the DWH system using DB2 BLU.But certain SQL's performance is extremely bad.Problem SQLs are with the GROUP BY subquery and the SET clause subselect.STSC says it‘s a matter of architecture, not a problem and they offered...
about 10 years ago in Db2 / BLU Acceleration 0 Planned for future release

Do not truncate trailing blanks in columnar Group By

BLU columnar engine does not carry trailing blanks in varchar columns during GROUP BY processing. It does not bring non-normalized variant through the grouping operation
over 4 years ago in Db2 / BLU Acceleration 0 Not under consideration

Allow data type ROW CHANGE TIMESTAMP in column-organized tables

We need the ability to define columns with data type ROW CHANGE TIMESTAMP in our tables so that we can track when the last change was made. Currently we use normal row based tables which allow this but we want to migrate to column based tables. Wh...
almost 7 years ago in Db2 / BLU Acceleration / Data Types 0 Not under consideration

using none unique index to accelerate update and delete on column-organized

there is a limitation (https://www.ibm.com/support/knowledgecenter/SSEPGG_11.5.0/com.ibm.db2.luw.admin.perf.doc/doc/r0061828.html) Update and delete operations that use an index scan on a column-organized table are not supported by the FETCH opera...
almost 5 years ago in Db2 / BLU Acceleration 0 Not under consideration

BLU should tolerate Tools and Applications which are currently not BLU-aware

We currently employ with the introduction of db2 v10.5 BLU for our DWH. Our plan is to store almost all data in columns store. Just in exceptional cases tables should be stored row oriented. That's why we have set the registry variable DB2_WORKLOA...
about 10 years ago in Db2 / BLU Acceleration 1 Not under consideration

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