1、问题现象
SQL> drop user goldengate cascade;
Drop goldengate用户时，报ORA-00604 ORA-20782 ORA-06512错误，具体报错内容如下：
drop user goldengate cascade
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 2
ORA-20782: Oracle GoldenGate DDL Replication Error: Code :ORA-20782: Cannot
DROP object used in Oracle GoldenGate replication while trigger is enabled.
Consult Oracle GoldenGate documentation and/or call Oracle GoldenGate Technical
Support if you wish to do so., error stack: ORA-06512: at line 261
ORA-06512: at line 1111
2、原因分析
由于在安装OGG时，配置并开启了DDL捕获功能，而OGG的DDL捕获，是依赖DDL触发器实现的，DDL处于enabled状态，drop goldengate user操作也属于DDL操作，所以产生ORA-00604 ORA-20782错误
3、验证DDL触发器状态
SQL> set linesize 999
SQL>select owner,trigger_name,trigger_type,triggering_event,status from dba_triggers where trigger_name like 'GGS%';
OWNER TRIGGER_NAME TRIGGER_TYPE TRIGGERING_EVENT STATUS
----------------- --------------------------- ----------------------- ----------------------------- ---------
SYS GGS_DDL_TRIGGER_BEFORE BEFORE EVENT DDL ENABLED
4、删除触发器
SQL>drop trigger sys.GGS_DDL_TRIGGER_BEFORE
5、再次尝试删除用户
SQL> drop user goldengate cascade;
drop user goldengate cascade
*
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 1
ORA-14452: attempt to create, alter or drop an index on temporary table already in use
再次报错，但是报错内容发生了改变
报错意思为：试图创建，更改或删除正在使用的临时表中的索引
6、找出正在使用临时表的会话，并killsession
SQL>select 'alter system kill session '''||sid||','||serial#||'''' from v$session where sid in
(select sid from v$lock where id1 in
(select object_id from dba_objects where object_name in (select table_name from dba_tables where owner='GOLDENGATE')));
7、再次删除用户
SQL> drop user goldengate cascade;