Thursday, November 20, 2014

Useful DB2 administrative functions and views

Did you know that there are about 80 (eight-zero) administrative views in the SYSIBMADM schema in DB2 that are ready for use? I have used several of them and also looked into the documentation, but 80 is quite a lot. (Almost) All of them are documented in the DB2 Knowledge Center in the "Built-in routines and views" section.

The routines live in the SYSPROC schema, administrative views can be found in the schema SYSIBMADM. Given that insight it is easy to construct a simple query to find all available views:

SELECT viewname from syscat.views where viewschema='SYSIBMADM'

Depending on your version and fixpack level of DB2 the result will vary. Speaking of fixpack level, do you know how to find out what your system is running by using SQL? The view ENV_INST_INFO may help in that case because it returns instance-related information such as the instance name, the DB2 version, fixpack, and build level:

SELECT * FROM SYSIBMADM.ENV_INST_INFO

Are you connected to, e.g., an Advanced Workgroup Server Edition (AWSE) of DB2 or an Enterprise Server Edition (ESE)? Find out by querying the product information using the view ENV_PROD_INFO. It returns the installed product, the kind of active licenses, and more:

SELECT * FROM SYSIBMADM.ENV_PROD_INFO

Next in the list of useful views with system information is ENV_SYS_INFO. It can be utilized to find out more about the operating system, the type of hardware, installed CPU and memory, etc.:

SELECT * from SYSIBMADM.ENV_SYS_INFO

Last, but not least in my list of views with basic system information are DBMCFG and DBCFG. As the name implies can these views help to retrieve the current instance (database manager / dbm) or the current database (db) configuration. So it is easy to find out whether the self-tuning memory manager (STMM) is active or where diagnostic logs are stored.

That's it for today, I am back to playing with more of those views (and routines)...

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