Update statistics why/how

Dear Forum
I am running a light weight OLTP workload with MaxDB and
am hitting my first bottlenecks.  It was suggested that I run update statistics.  I can't seem to get it working according to the online documentation.  I need to run
exec_xpu or xpu.  Neither works.  The database is ONLINE.
Any idea what I'm doing wrong?
Also - how often should the statistics be updated?
Thanks!
dbmcli -d igen -u DBA,DBA
dbmcli on IGEN>exec_xpu
ERR
-24964,ERR_EXECUTE: error in program execution
65280,xpu
Error during searching of the name of the database: no database name found

Sorry I did get this working -
sqlcli  -d igen -u DBA,DBA
update statistics customer_125
However it made no change in performance!
If anyone has a good paper or pointer to one on high performance tuning for a new-guy that would be appreciated!
/regards
Don C.

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