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DB2

To drop an instance do (as root):

<db2 install dir>/instance/db2idrop <instance>

To read settings for one instance:

<db2 install dir>/adm/db2set -i <instance>

and (as instance owner):

db2 get db cfg for <db2 instance>

To read global settings:

<db2 install dir>/adm/db2set -g