asked on

Remove Oracle Schema

Hi Experts,

How to remove an Oracle schema from the Database ? ( Google search says - Empty the Schema and Delete . But Are there any DOS/SQL script for emptying a schema?)

Alternatively , Following is good enough for me

I have an Oracle database restored from the .dmp file . After a few months client gives a new .dmp file . How can I restore this new .dmp file now to the existing Database?

Thanks

Sam

Naveen Kumar

you can drop the required schemas by logging into the database before importing right

Sam OZ

ASKER

Hi Nav_kum,

But I tried Drop Schema command . it didn't work . Some say you have to empty the schema before deleting it . How to do that ?

Naveen Kumar

alternatively, you can select the schemas/tables which you want to import from the dmp file. check the below url and it lists down all options/parameters of impdp.

http://www.oracle-base.com/articles/10g/oracle-data-pump-10g.php

Thanks

Sam OZ

ASKER

BTW , Experts - I am using Oracle 10g

Naveen Kumar

hmmm.. login with the dba user and run the below command :

drop user <<user_name>> ;

In oracle, schema names are the same as the user names. For example, if you want to empty a schema SCOTT then run the below command :

drop user scott;

Thanks

Naveen Kumar

https://community.oracle.com/thread/507126?tstart=0 ---> just give a read through to enhance your understanding of the users/schemas

Sam OZ

ASKER

Hi Nav,

I got a fair idea of Schema and Users . The issue is when I try to drop user .. It says " Unable to drop a User in use " ..... I am able to drop another users ... But I don't really get an idea of what really locks my user .. There is no application making use of the schema

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Naveen Kumar

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Alex [***Alex140181***]

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slightwv (䄆 Netminder)

This might already be in some of the links above (I didn't open them).

You might also need to specify cascade on the drop user command when they own objects:
drop user some_user cascade;

You likely will then need to recreate the user before import if the export is just the schema.

David VanZandt

To drop a user/schema requires that account to be not in use, and to have DBA privilege to execute the DROP command. Is that true in your situation?

Does the dumpfile contain more than the one schema's tables and similar objects? If you can provide the imp or impdp script, without the user/password.

The following is an example of using the SCHEMAS parameter. You can create the expdat.dmp file used in this example by running the example provided for the Export SCHEMAS parameter. See SCHEMAS.

> impdp hr/hr SCHEMAS=hr DIRECTORY=dpump_dir1 LOGFILE=schemas.log
DUMPFILE=expdat.dmp