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NONBLOCKED option for event monitors to prevent them from blocking user services
Db2 locking event monitor may block deadlocked applications from proceeding for a purpose of making event monitors work under some circumstances. (Reported on case TS007885986)Since it could damage user's business services severely, user should be...
Turn on reclaimable storage without dropping/recreating the tablespaces
After a migration from db2 9.5 to 10.1, several days passed, and we reached the maximum size of a DMS tablespace of 4K.We moved one table to a different tablespace, but still noticed that the free pages were equal to 0. We tried to execute the al...
Make the Db2 Server and Client support ROWSET cursors
The Db2 server and client (Db2 Connect) today does not support ROWSET cursors. Support of Multirow Fetch Db2 Precompiler and embedded Runtime support the fetch of multiple rows by using a single FETCH statement. Db2 ESQL enables arrays to be passe...
Poor performance on DB2 V11.1 due to changes in build process
Some customers are noticing performance degradations moving from v105 ESE to v111 ESE on the same hardware.These degradations are most pronounced in OLTP workloads, with an emphasis on INSERT and UPDATE operations.Db2 Support has confirmed that th...
Make reducible the tablespace size in pureScale environments
DB2 LUW does not support reducing container file size in the alter tablespace statement as below.â€¢The following clauses are not supported in DB2 pureScaleÂ® environments:â—¦LOWER HIGH WATER MARKâ—¦LOWER HIGH WATER MARK STOPâ—¦REDUCE, unless it i...
Add table function to "pretty print" explained statement
Db2 allows to install the EXPLAIN TABLES using a procedure (https://www.ibm.com/support/knowledgecenter/SSEPGG_11.1.0/com.ibm.db2.luw.admin.explain.doc/doc/t0059594.html)
There are different ways to generate an access plan, i.e., to explain ...
INSTANCE_MEMORY AUTOMATIC should be automatic, not calculated
The default value of the INSTANCE_MEMORY parameter is AUTOMATIC. The AUTOMATIC setting results in a value that is computed at database partition activation. This behavior is inflexible regarding dynamic memory changes e.g. for AIX LPARs. Today it ...
Improve performance of SET INTEGRITY command through use of (intra partition) parallelism
SET INTEGRITY does currently not make use of intrapartition parallelism.SET INTEGRITY (with "checked" option) for large tables and/or tables with many foreign key and/or check constraints consumes a large amount of time while the table is not acce...
Ability to purge the bufferpools (perhaps specified by bufferpool name) without deactivating the entire database.While dirty pages can be flushed from bufferpools with the flush bufferpools command, the bufferpools cannot be entirely purged withou...
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