| why oracle doestn't start database after closing [message #329890] |
Thu, 26 June 2008 23:58  |
abs_amit
Messages: 59
Registered: January 2006
Location: delhi
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Member |
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Hi,
My doubt is why oracle doesn't allow to open the database back again once we close is manually, and same with the dismount and mount. Why it behaves like a one way operation?
SQL> startup
ORACLE instance started.
Total System Global Area 419430400 bytes
Fixed Size 1249368 bytes
Variable Size 205524904 bytes
Database Buffers 205520896 bytes
Redo Buffers 7135232 bytes
Database mounted.
Database opened.
SQL> alter database close;
Database altered.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-16196: database has been previously opened and closed
SQL> alter database dismount;
Database altered.
SQL> alter database mount;
alter database mount
*
ERROR at line 1:
ORA-00750: database has been previously mounted and dismounted
Thanks
Amit Yadav
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| Re: why oracle doestn't start database after closing [message #329896 is a reply to message #329890] |
Fri, 27 June 2008 00:10  |
varu123
Messages: 754
Registered: October 2007
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Senior Member |
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| Quote: | ORA-00750: database has been previously mounted and dismounted
Cause: The instance has already mounted and dismounted the database, which is only allowed once in its lifetime.
Action: Shut down the database.
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The life of an instance ends with shutdown command.
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| Re: why oracle doestn't start database after closing [message #329905 is a reply to message #329896] |
Fri, 27 June 2008 00:53 |
abs_amit
Messages: 59
Registered: January 2006
Location: delhi
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Member |
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Guys, thanks for responses.
i think i could not explain what does that mean. i am not asking about the solution but asking about the cause for the same.
let me try to explain what i expect:
i have been working on oracle for last 4 years and know about the basic concepts.
i know that we have to shutdown the database first before we start.
My doubt is about the internal Method of Oracle.
Why we have to shutdown the database completely before we can start it back? Why it doesn’t allow us to open the database from mount stage directly?
What is the internal mechanism of oracle? Is there any special reason why Oracle has made it like this?
[Updated on: Fri, 27 June 2008 01:09] Report message to a moderator |
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| Re: why oracle doestn't start database after closing [message #329939 is a reply to message #329890] |
Fri, 27 June 2008 01:59 |
varu123
Messages: 754
Registered: October 2007
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Senior Member |
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A checkpoint occurs when you issue alter database close.
So the datafiles are consistent with control files.
ORacle should allow the datafiels to open after "ALTER DATABASE CLOSE".
It would be interesting to know the real reason behind this cause:
| Quote: | The instance has already mounted and dismounted the database, which is only allowed once in its lifetime.
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| Re: why oracle doestn't start database after closing [message #329967 is a reply to message #329953] |
Fri, 27 June 2008 03:01 |
abs_amit
Messages: 59
Registered: January 2006
Location: delhi
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Member |
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| Michel Cadot wrote on Fri, 27 June 2008 12:54 | The real reason is that you MUST NOT use this so why Oracle should implement something that you can't use because you should not use the first part?
Regards
Michel
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you are absolutely right Michel. But see from user's point of view. will this be not so comfortable if we have this feature.
Lets take some very general scenario why i want this :
if i implement some changes in the database and need to bounce the database, so there is no other option than shutdown and startup.
but if i do shutdown, it will stop the instance and immediately it will cause a Severity-1 issue and will start generating critical alerts.
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| Re: why oracle doestn't start database after closing [message #329974 is a reply to message #329967] |
Fri, 27 June 2008 03:08 |
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Michel Cadot
Messages: 68718
Registered: March 2007
Location: Saint-Maur, France, https...
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Senior Member
Account Moderator |
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| Quote: | will this be not so comfortable if we have this feature.
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You can always ask Oracle to add this but it seems no enough people ask it in the 20 years.
So it seems it would be not so useful.
| Quote: | if i do shutdown, it will stop the instance and immediately it will cause a Severity-1 issue and will start generating critical alerts.
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This is because your probe is not correct, it should test if database is open and not if instance is there. Then there will be no difference between instance down and database closed.
Is not "open" the criteria for clients?
Regards
Michel
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