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Oracle table in SYSTEM tablespace tips

Oracle Database Tips by Donald BurlesonFebruary 10, 2015

I created an Oracle table and instead of going to the USERS tablespace, it was stored in my SYSTEM tablespace.  Why did Oracle create my table in the SYSTEM tablespace?


Answer:  When creating a table it is customary to specify a "tablespace XXX" clause.  If you omit the the "tablespace" clause, Oracle will create the table in the user's default tablespace.  To change the default tablespace for a user you can issue this command:


alter user scott default tablespace users;


This will keep new tables from getting into the system tablespace.  To move a table from the system tablespace, you can use the alter table move tablespace xxx command.


You can also use the CTAS and rename commands but you must re-add the table constraints:


create table temp as select * from mytab tablespace users;

rename mytab to oldtab;

rename temp to mytab;

drop table oldab;

-- rebuild all table indexes and constraints



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