Difference Between Shutdown and Close Database

Hi all,
Let say I want to start the instance of database with the following processes :
1. STARTUP MOUNT
2. ALTER DATABASE OPEN
With two commands above, now the database is open. Then, I want to close the database with command :
3. ALTER DATABASE CLOSE
After this, I want to reopen the database again by using this :
4. ALTER DATABASE OPEN
I know that it will produce an error because when the database is opened and closed, its lifetime has already ended, so we must shutdown it first.
My questions are :
1. What's the difference between CLOSE and SHUTDOWN ? Suppose in the case above, I want to close the database. Why don't I just type SHUTDOWN ? Why is it necessary for me to use command CLOSE instead of SHUTDOWN ?
2. What are the conditions of database when I CLOSE database, also, what are the conditions of database when I SHUTDOWN database ? I want to know more detail because I have tried to find in google, but now satisfying result
Thanks before
Edited by: cycon on Nov 8, 2010 9:00 AM

alter database close;this you can execute only from OPEN status
when ever you close the database it will go to mount status here you cannot open the database again, you need to clean sutdown and need to startup.
alter database open;ths you can execute only on MOUNT status, it will takes you to mount --> open status.
Thanks

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http://logicblaze.com/
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Hi all,
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http://www.sap-img.com/abap/learning-bdc-programming.htm
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http://help.sap.com/saphelp_47x200/helpdata/en/69/c250684ba111d189750000e8322d00/frameset.htm
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http://www.sap-img.com/abap/question-about-bdc-program.htm
http://www.itcserver.com/blog/2006/06/30/batch-input-vs-call-transaction/
http://www.planetsap.com/bdc_main_page.htm
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amit

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hi
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