The difference in SID,INSTANCE_NAME,DB_NAME,GLOBAL_NAME

hi,
who can tell me the difference in SID,INSTANCE_NAME,DB_NAME,GLOBAL_NAME
many thanks,
zhiwei

who can tell me the difference in
SID,INSTANCE_NAME,DB_NAME,GLOBAL_NAMEthe SID, or Oracle System Identifier, uniquely identifies your Instance on the server, it is usually set in an environment variable called ORACLE_SID
the INSTANCE_NAME must match your ORACLE_SID. In Real Application Cluster, you can have more than one INSTANCE per DATABASE, in which case the INSTANCE_NAME's must be unique.
the DATABASE_NAME usually is the same as INSTANCE_NAME, but can be different (ex:RAC), and it is saved in the CONTROL FILE. to change it, you must recreate the controlfile (Oracle 7) or use the NID utility.
the GLOBAL_NAME can be anything you want, is sometimes used in TNSNAMES.ORA, can be changed with ALTER DATABASE RENAME, and defaults to DB_NAME.DOMAIN_NAME
the SERVICE_NAMES provide one or more SERVICE_NAME to be registered in your listener.
As always, read the ***fine*** manual

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    Given what I know about your emnity towards DeployDirector (which is clearly illustrated in this thread: http://forum.java.sun.com/thread.jsp?thread=348061&forum=38&message=1446155 that was evidently a response to this article: http://www.javaworld.com/javaworld/jw-11-2002/jw-1122-autoupdate.html) I'm going to take a (pardon the expression) "don't feed the trolls" approach here.
    I'm simply re-iterate that JNLP, and its implementations such as Web Start and OpenJNLP, are designed for a very different set of users that DeployDirector. The differences in functionality between the two products reflect that.
    The enterprise has different requirements in a deployment mechanism for its internal, critical applications than software vendors and independant developers. DeployDirector addresses the requirements of the enterprise. Frankly, most of our recent customers only chose to buy the product after initially rejecting it and (unsucessfully) attempting to use JNLP and Web Start. Sometimes people only learn the hard way: different users have different requirements which are suited to different tools or technologies.
    Sonal

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