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标题: 数据库如何进入限制模式 [打印本页]

作者: 郑全 时间: 2019-12-1 15:11
标题: 数据库如何进入限制模式
有时我们数据库需要进入限制模式，比如维护时。那么，如何才能让系统进入限制模式呢？

1.打开数据库直接进入限制模式
  startup open restricted;

2.修改打开的数据库进行限制模式
alter system enable restricted session;

看监听服务的状态：

LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=dbserver)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias                   LISTENER
Version                TNSLSNR for Linux: Version 12.1.0.2.0 - Production
Start Date             01-DEC-2019 09:50:50
Uptime                   0 days 5 hr. 16 min. 35 sec
Trace Level             off
Security                ON: Local OS Authentication
SNMP                   OFF
Listener Parameter File /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/listener.ora
Listener Log File       /u01/app/oracle/diag/tnslsnr/dbserver/listener/alert/log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=dbserver.sztech.com)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=dbserver.sztech.com)(PORT=5500))(Security=(my_wallet_directory=/u01/app/oracle/admin/emrep/xdb_wallet))(Presentation=HTTP)(Session=RAW))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcps)(HOST=dbserver.sztech.com)(PORT=5501))(Security=(my_wallet_directory=/u01/app/oracle/admin/orcl/xdb_wallet))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "cdb1" has 1 instance(s).
  Instance "cdb1", status RESTRICTED, has 1 handler(s) for this service...
Service "cdb1XDB" has 1 instance(s).
  Instance "cdb1", status RESTRICTED, has 1 handler(s) for this service...
Service "emrep" has 1 instance(s).
  Instance "emrep", status READY, has 1 handler(s) for this service...
Service "emrepXDB" has 1 instance(s).
  Instance "emrep", status READY, has 1 handler(s) for this service...
Service "orcl" has 1 instance(s).
  Instance "orcl", status RESTRICTED, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
  Instance "orcl", status RESTRICTED, has 1 handler(s) for this service...
Service "pdb1_1" has 1 instance(s).
  Instance "cdb1", status RESTRICTED, has 1 handler(s) for this service...
Service "pdb2" has 1 instance(s).
  Instance "cdb1", status RESTRICTED, has 1 handler(s) for this service...
The command completed successfully
LSNRCTL>

作者: 郑全 时间: 2020-1-15 18:51
1.查看实例处于限制模式：

SQL> select instance_name,status,logins from v$instance;
INSTANCE_NAME                   STATUS                LOGINS
-------------------------------- ------------------------ --------------------
orcl                            OPEN                   RESTRICTED

目前已经为限制模式了。

2.普通用户进行登录，将报错：
SQL> conn sztech/sztech
ERROR:
ORA-01035: ORACLE 只允许具有 RESTRICTED SESSION 权限的用户使用

SQL>

3.授予限制会话权限
SQL> conn / as sysdba
已连接。
SQL> grant restricted session to sztech;
授权成功。

--再次登录，就可以了。
SQL> conn sztech/sztech
已连接。
SQL>

注意：再数据库变为限制会话模式之前登录的用户，不受影响。

4.取消限制模式：
SQL> alter system disable restricted session;
系统已更改。

5.验证，目前已经取消限制模式，普通用户可以登录

SQL> select instance_name,status,logins from v$instance;
INSTANCE_NAME                   STATUS                LOGINS
-------------------------------- ------------------------ --------------------
orcl                            OPEN                   ALLOWED
SQL>

6.普通用户已经可以登录：
SQL> conn hr1/hr1
已连接。
SQL>

作者: 郑全 时间: 2020-1-15 18:55
要删除数据库，必须把数据库以限制模式mount
之后，就可以删除数据库了。

drop database;

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