What's the difference among "global name", "db_name","instance_name"......?

Hi. Everyone.
I am really confused about the following.
What are the difference among
1. global_name
2. db_name
3. instance_name
4. domain_name
5. SID
6. service_name(tnsnames.ora)
Can anybody explain the difference among them clearly?
I read some documents, but I am really confused.
One more question!!
Can I set or change "global name" in initSID.ora file?(not global_names)
I used the following command on "open-mode", but it seems to be permenant.
After I re-started the databases, I found that global_name was changed.
-->alter database rename global_name to "global_name".
--> shutdown and restart
--> select * from global_name.
Thanks in advance.
Best Regards
Ho

This forums has a nice feature: search engine :)
check this link:
the difference in SID,INSTANCE_NAME,DB_NAME,GLOBAL_NAME
Best Regards
Krystian Zieja / mob

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