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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 b...
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...
When we receive the following error message (during LOAD): SQL3015N An SQL error "-551" occurred during processing. we only know, that it is an authorization issue. The detail information (authorization-id, operation, object-name) are not availabl...
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...
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 t...
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 a...
When new table is created, some migration is performed and similar it is pretty important info when object was last accessed. Db2 has LASTUSED, e.g SYSCAT.TABLES.LASTUSED column, but the data in this column can be according to documentation up to ...
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 ...
db2start of a running instance should reload/restart configuration without interruption of current sessions
Sometimes dbm configuration changes are not active immediately and require a full instance restart. E.g. adding an SSL port and config updates of the db catalog changes in SYS*_GROUP ... It would be great, if a db2start command is issued while the...
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