SELECT * FROM dba_profiles s WHERE s.profile=‘DEFAULT‘ AND resource_name=‘PASSWORD_LIFE_TIME‘;--如果后面显示180天的请将密码有效期由默认的180天修改成“无限制”：
ALTER PROFILE DEFAULT LIMIT PASSWORD_LIFE_TIME UNLIMITED;
alter user system identified by dreamsoft;
select * from dba_directories;
create or replace directory dmp as ‘E:\dmp‘;
expdp system/[email protected] DIRECTORY=dmp DUMPFILE=GSDX_20190810.dmp FULL=y
impdp system/[email protected] DIRECTORY=dmp DUMPFILE=CDZZ20191119.DMP FULL=y
impdp system/[email protected] DIRECTORY=dmp DUMPFILE=XMDX_20191208.DMP remap_schema=dsoa:xmdx logfile=xmdx.log
imp dsoa/[email protected] file=E:\dmp\daochu.dmp FULL=y
create user xmdx identified by dreamsoft default tablespace users;
grant resource,connect,dba to xmdx;
commit;--提交
imp dsoa/[email protected] file=e:\dmp\20190820szdx.dmp full=y
--查询数据库用户
select * from dba_users;
drop user xmdx cascade;
--修改memory_target大小
show parameters target;
alter system set memory_target=512M scope=spfile;
alter system set memory_max_target=512M scope=spfile;
alter system set deferred_segment_creation=false scope=spfile;
select username,account_status from dba_users where username=‘DSOA‘;--查看到DSOA用户锁了
alter user DSOA account unlock;--解锁DSOA用户
select * from dba_profiles where RESOURCE_NAME=‘FAILED_LOGIN_ATTEMPTS‘;--查看用户限制登陆次数
alter profile default limit failed_login_attempts unlimited;--修改用户无论输入多少次都不会被锁定
1、在运行中输入CMD
2、在命令行输入sqlplus /nolog （不登陆数据库，只启动sqlplus）
3、SQL> conn /as sysdba
已连接。
4、SQL> alter user system identified by 123456;
用户已更改。
password即为要修改的新密码。
原文地址：https://www.cnblogs.com/wangSoft/p/12269859.html