Question

Drop all tables or Drop Schema Oracle 10g

Asked by: uksub

I'm using Imp "dmp" file to import into my existing database.  I've been told that I can drop all the tables via a "drop schema" command within the Oracle 10g Enterprise Manager gui, but I can't see the option to do it.  Is that because I don't have the correct user permissions?

Can someone guide me through the process of dropping all the tables in my database so I don't get the "duplicate constriant" errors?

Thank you

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Asked On
2008-08-06 at 15:15:40ID23627576
Tags

oracle

,

Oracle

,

10g

Topic

Oracle 10.x

Participating Experts
3
Points
250
Comments
8

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Answers

 

by: professionalcomputersolutionsPosted on 2008-08-06 at 15:20:01ID: 22175712

you need to execute the commands in the correct order in able to drop the tables.

First you need to drop constraints.
Second drop tables

 

by: professionalcomputersolutionsPosted on 2008-08-06 at 15:22:07ID: 22175732

drop table [Oracle SQL]
            
drop table table_name;
drop table table_name cascade constraints;
drop table table_name purge;


The drop table command moves a table into the recycle bin unless purge was also specified.
purge
Normally, a table is moved into the recycle bin (as of Oracle 10g), if it is dropped. However, if the purge modifier is specified as well, the table is unrecoverably (entirely) dropped from the database.
cascade constraints
Deletes all foreign keys that reference the table to be dropped, then drops the table.

 

by: professionalcomputersolutionsPosted on 2008-08-06 at 15:22:30ID: 22175736

you probably want to use

drop table table_name cascade constraints;

                                              
1:

Select allOpen in new window

 

by: uksubPosted on 2008-08-06 at 17:05:15ID: 22176441

i've got over 100 tables... do I have to drop them one at a time?  Someone mentioned to me "drop the schema".   Is that an option to "drop all tables"?

 

by: professionalcomputersolutionsPosted on 2008-08-06 at 17:05:49ID: 22176447

try wild cards *

 

by: professionalcomputersolutionsPosted on 2008-08-06 at 17:06:11ID: 22176448

drop table * cascade constraints;

 

by: sdstuberPosted on 2008-08-06 at 21:48:59ID: 22177955

there is no such command as "drop schema" in Oracle.
You can check the Oracle SQL Reference here.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/toc.htm

to drop all the tables in a schema try this....


begin
    for t in (select table_name from dba_tables where owner = 'YOUR_OWNER_GOES_HERE') loop
        execute immediate 'drop table YOUR_OWNER_GOES_HERE.' || t.table_name';
    end loop;
end;

                                              
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by: dbmullenPosted on 2008-08-07 at 19:25:28ID: 22187100

1)  export the target database in case you drop something they might want later
      at least with ROWS=N
      that will save all the objects

2)  save the user  and all the permission
       I use TOAD for this, but, I think you can get a "create script" from OEM by right-click on user

3)  to drop a "schema", you drop the user
      that will drop ALL tables, views, contraints, triggers, EVERYTHING for that schema!!!!!!!!!!!!!!!!!!
     don't run this until you are sure you have the USER saved
     --  again, all objects for this user will be dropped.
     -- be very careful you drop the correct one.
      drop user YOUR_USER_HERE cascade;

4)  create the user saved from step 2
      if you skipped that step, hope someone know what the password should be.

5)   import the data

20120131-EE-VQP-002

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