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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...
Allow native support of user-defined collation such as EBCDIC in CREATE DATABASE command
This will allow easy creation of databases on LUW supporting EBCDIC collations which will in-turn allow easy migration for Db2 on z/OS to Db2 LUW. Currently, this is only supported via the user-defined option of sqlecrea() api and a C program has ...
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...
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 ...
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 witho...
Error DIA3202C in db2diag.log does not include database name
getting an error in db2diag.log that a connection to a database ist not possible because of a TCP/IP call does not work. In our case a connection to a remote database should be established, which was already dropped. But there is no database name ...
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