Ambience Ambience - 1 month ago 6
SQL Question

Dropping all user tables/sequences in Oracle

As part of our build process and evolving database, I'm trying to create a script which will remove all of the tables and sequences for a user. I don't want to do recreate the user as this will require more permissions than allowed.

My script creates a procedure to drop the tables/sequences, executes the procedure, and then drops the procedure. I'm executing the file from sqlplus:

drop.sql:


create or replace procedure drop_all_cdi_tables
is
cur integer;
begin
cur:= dbms_sql.OPEN_CURSOR();
for t in (select table_name from user_tables) loop
execute immediate 'drop table ' ||t.table_name|| ' cascade constraints';
end loop;
dbms_sql.close_cursor(cur);

cur:= dbms_sql.OPEN_CURSOR();
for t in (select sequence_name from user_sequences) loop
execute immediate 'drop sequence ' ||t.sequence_name;
end loop;
dbms_sql.close_cursor(cur);
end;
/
execute drop_all_cdi_tables;
/
drop procedure drop_all_cdi_tables;
/


Unfortunately, dropping the procedure causes a problem. There seems to cause a race condition and the procedure is dropped before it executes.

E.g.:


SQL*Plus: Release 11.1.0.7.0 - Production on Tue Mar 30 18:45:42 2010

Copyright (c) 1982, 2008, Oracle. All rights reserved.


Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options


Procedure created.


PL/SQL procedure successfully completed.


Procedure created.


Procedure dropped.

drop procedure drop_all_user_tables
*
ERROR at line 1:
ORA-04043: object DROP_ALL_USER_TABLES does not exist


SQL> Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - 64
With the Partitioning, OLAP, Data Mining and Real Application Testing options


Any ideas on how to get this working?

Answer

If you're not intending on keeping the stored procedure, I'd use an anonymous PLSQL block:

BEGIN

  --Bye Sequences!
  FOR i IN (SELECT us.sequence_name
              FROM USER_SEQUENCES us) LOOP
    EXECUTE IMMEDIATE 'drop sequence '|| i.sequence_name ||'';
  END LOOP;

  --Bye Tables!
  FOR i IN (SELECT ut.table_name
              FROM USER_TABLES ut) LOOP
    EXECUTE IMMEDIATE 'drop table '|| i.table_name ||' CASCADE CONSTRAINTS ';
  END LOOP;

END;
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