Could not create a DataSource module in WebLogic 6.1

[ecyber]

I was using WebLogic 6.1 built-in examplesServer. I wanted to create a DataSource object called

examples-dataSource-xyzPool using console interface. The params I used are:

Name: examples-dataSource-xyzPool
JNDI Name: examples-dataSource-xyzPool
Pool Name: demoPool
Row Prefetch Size: 48
Stream Chunk Size: 256

And I targeted it to the examplesServer. I am sure the examplesServer is running and demoPool is

active.

The problems I got were:
1) examples-dataSource-xyzPool was not shown up in the config.xml. When I restarted examplesServer,

all the setup of examples-dataSource-xyzPool were gone. (I did press the "Apply" button.)
2) examples-dataSource-xyzPool was not shown up in the JNDI tree of WebLogic console.

By the way, I have not installed WebLogic Service Patch 2. But does that matter?
It did not work at all. Help please.

Thanks in advatage.
ecyber