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What is happening during "linking Oracle database" step?

During installation using the universal installer, what is actually happening when it says it's "linking Oracle database"? Also, is there another way of creating a database than with DBCA?

I am a newbie with Oracle. I have been trying to install Oracle on my machine. I just have a few questions to ask.
  1. During installation using the universal installer, I see there's a step it goes through saying "linking Oracle database." What is it doing actually?
  2. I created my database using DBCA. Is there another way of creating a database, and if so how does one do that?
I would really be grateful if you could help me.
According to Doc ID# 131321.1 ("How to Relink Oracle Database Software on UNIX") on Oracle's Metalink site, a good explanation of relinking is as follows:
Applications for UNIX are generally not distributed as complete executables. Oracle, like many application vendors who create products for UNIX, distribute individual object files, library archives of object files, and some source files which then get 'relinked' at the operating system level during installation to create usable executables. This guarantees a reliable integration with functions provided by the OS system libraries.

With respect to your second question, a database can be created manually versus via the DBCA interface. For complete instructions on how to do this, review the Oracle Database Administrator's Guide 10g Release 2 (10.2). Simply click on the section titled "Manually Creating an Oracle Database."

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