DB2 uses the operating system for authentication. Thus, any valid user / password that you can use to log in should allow you to connect to the sample database and request it.
The DB2 configuration utility will ask you to enter the username and password for the administrator identifier (aka "instance owner"), and it will create these identifiers on your system. The default for these identifiers is: db2inst1 on Linux / UNIX; db2admin on windows.
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