下面介绍下，如何删除ddl环境：
1、Log in to SQL*Plus as a user that has SYSDBA privileges。
2、Disconnect all sessions that ever issued DDL, including those of Oracle GoldenGate processes, SQL*Plus,
business applications, and any other software that uses Oracle. Otherwise the database might generate an ORA-04021 error.
3、@ddl_disable.sql
4、@ddl_remove.sql
5、@marker_remove.sql
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