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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 itâ€˜s a matter of architecture, not a problem and they offered...
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...
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...
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...
As of DB2 for LUW Version 10.5 Fixpack 7, DB2 BLU still doesn't support non-unicode database, e.g. GBK. We need DB2 BLU to support database in codepage GBK, so that Chinese characters can be internally stored in double-byte, otherwise a data page ...
Support XA transactions on column-organized tables
We have a main DW database on DB2 for z/OS and a Datamart on DB2 for LUW. Some tables on both z/OS and LUW are populated using Cobol programs which are submitted from the mainframe. We want to convert the Datamart on DB2 LUW to BLU, but the Cobol ...
[Copy] 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...
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