Topic: Miscellaneous >> diff. between...
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| Deepakkumar |
Posted: Jul 23, 2008 03:29:37 AM |
Total Post: 34
Joined: Dec, 2007
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| can anybody tell me diff. between startup mount and startup nonmount. |
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 balaji |
| Posted: Jul 23, 2008 04:13:52 AM |  |
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Total Post: 164
Joined: May, 2008
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Startup nomount
When you issue the startup command, the first thing the database will do is enter the nomount stage. During the nomount stage, Oracle first opens and reads the initialization parameter file (init.ora) to see how the database is configured. For example, the sizes of all of the memory areas in Oracle are defined within the parameter file.
After the parameter file is accessed, the memory areas associated with the database instance are allocated. Also, during the nomount stage, the Oracle background processes are started. Together, we call these processes and the associated allocated memory the Oracle instance. Once the instance has started successfully, the database is considered to be in the nomount stage. If you issue the startup command, then Oracle will automatically move onto the next stage of the startup, the mount stage.
Startup Mount
During the mount stage,it opens and reads the control file. The control file is a binary file that tracks important database information, such as the location of the database datafiles.
In the mount stage, Oracle determines the location of the datafiles, but does not yet open them. Once the datafile locations have been identified, the database is ready to be opened.
Startup
The last startup step for an Oracle database is the open stage. When Oracle opens the database, it accesses all of the datafiles associated with the database. Once it has accessed the database datafiles, Oracle makes sure that all of the database datafiles are consistent.
Regards,
Balaji
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| Deepakkumar |
| Posted: Jul 23, 2008 04:42:06 AM | |
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Total Post: 34
Joined: Dec, 2007
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| Deepakkumar |
| Posted: Jul 23, 2008 04:42:32 AM | |
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Total Post: 34
Joined: Dec, 2007
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| positive |
| Posted: Aug 11, 2008 09:16:15 PM | |
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Total Post: 483
Joined: Jun, 2008
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