1.用户管理 (1)建立用户(数据库验证) CREATE USER smith IDENTIFIED BY smith_pwd DEFAULTTABLESPACE users TEMPORARY TABLESPACE temp QUOTA 5m ON users; (2)修改用户ALTER USER smith QUOTA 0 ON SYSTEM; (3)删除用户DROP USER smith; DROP USER smith CASCADE; (4)显示用户信息 DBA_USERS DBA_T…