Oracle在线日志添加

《一线大厂Java面试题解析+核心总结学习笔记+最新讲解视频+实战项目源码》，点击传送门，即可获取！

1.增加一个日志组(Widows)

---

SYS@ORCL> select group#,sequence#,bytes/1024/1024 M,archived,status from v$log;

GROUP# SEQUENCE# M ARC STATUS

---

1 269 50 NO INACTIVE

2 270 50 NO ACTIVE

3 271 50 NO CURRENT

SYS@ORCL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_

---

3 ONLINE /u01/app/oracle/oradata/ORCL/redo03.log NO

2 ONLINE /u01/app/oracle/oradata/ORCL/redo02.log NO

1 ONLINE /u01/app/oracle/oradata/ORCL/redo01.log NO

SYS@ORCL> alter database add logfile group 4 ‘/u01/app/oracle/oradata/ORCL/redo04.log’ size 50m;

SYS@ORCL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_

---

3 ONLINE /u01/app/oracle/oradata/ORCL/redo03.log NO

2 ONLINE /u01/app/oracle/oradata/ORCL/redo02.log NO

1 ONLINE /u01/app/oracle/oradata/ORCL/redo01.log NO

4 ONLINE /u01/app/oracle/oradata/ORCL/redo04.log NO

2.添加日志组的成员(Linux)

---

为每个组增加一个 member（一共是4个组）

先建好目录，准备放在/u01/app/oracle/oradata/ORCL/redoimage 下

[oracle@Jeames ~]$ cd /u01/app/oracle/oradata/ORCL

[oracle@Jeames ORCL]$ mkdir redoimage

SYS@ORCL> alter database add logfile member

‘/u01/app/oracle/oradata/ORCL/redoimage/redo01.log’ to group 1,

‘/u01/app/oracle/oradata/ORCL/redoimage/redo02.log’ to group 2,

‘/u01/app/oracle/oradata/ORCL/redoimage/redo03.log’ to group 3,

‘/u01/app/oracle/oradata/ORCL/redoimage/redo04.log’ to group 4;

SYS@ORCL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_

---

3 ONLINE /u01/app/oracle/oradata/ORCL/redo03.log NO

2 ONLINE /u01/app/oracle/oradata/ORCL/redo02.log NO

1 ONLINE /u01/app/oracle/oradata/ORCL/redo01.log NO

4 ONLINE /u01/app/oracle/oradata/ORCL/redo04.log NO

1 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo01.log NO

2 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo02.log NO

3 INVALID ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo03.log NO

4 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo04.log NO

注：STATUS 是 INVALID，说明 member 还没有同步好

alter system switch logfile; 至少做 4 次切换，消除 invalid

SYS@ORCL> alter system switch logfile;

SYS@ORCL> select group#,status,archived from v$log;

GROUP# STATUS ARC

---

1 INACTIVE NO

2 ACTIVE NO

3 CURRENT NO

4 ACTIVE NO

SYS@ORCL> select * from v$logfile;

GROUP# STATUS TYPE MEMBER IS_

---

3 ONLINE /u01/app/oracle/oradata/ORCL/redo03.log NO

2 ONLINE /u01/app/oracle/oradata/ORCL/redo02.log NO

1 ONLINE /u01/app/oracle/oradata/ORCL/redo01.log NO

4 ONLINE /u01/app/oracle/oradata/ORCL/redo04.log NO

1 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo01.log NO

2 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo02.log NO

3 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo03.log NO

4 ONLINE /u01/app/oracle/oradata/ORCL/redoimage/redo04.log NO

3.STATUS 四种状态

---

unused:

最后

针对以上面试题，小编已经把面试题+答案整理好了

面试专题

除了以上面试题+答案，小编同时还整理了微服务相关的实战文档也可以分享给大家学习

《一线大厂Java面试题解析+核心总结学习笔记+最新讲解视频+实战项目源码》，点击传送门，即可获取！
1bnWTm-1714644630759)]

[外链图片转存中…(img-Rj6eqcUZ-1714644630759)]

[外链图片转存中…(img-YqBmZHGv-1714644630760)]
《一线大厂Java面试题解析+核心总结学习笔记+最新讲解视频+实战项目源码》，点击传送门，即可获取！