11G R2 重做redo日志

其他 2018-08-05 11:56:35 阅读次数: 0
先闲扯下
这几天开发那边做一些大量数据操作cpu负载很高，而且发现归档目录被写满了造成用户登录不上，就赶紧进行处理，
处理过程就是用rman，将前几天archivelog删除，再用rman进行全备份一次。归档目录大小根据业务来定，我的目录是80G，
通常情况下可以用15天左右，后续会做相关调整。
偷袭就用了2天，所以开发在做大量数据前务必通知数据库相关维护人员。当时开发做的数据量超过1亿。
然后就带看了下alter日志发现，redo日志切换的很快，一分钟切三四次下面是8点到8点半的归档
一个归档文件大概是将近50M,网上找了一些资料看到redo切换时间控制在15-30分钟之间，如果redo切换间距时间太长容易数据丢失,
也就是如果redo切换间距时间为1小时，如果在这个一小时内当前的redo文件被损坏，那你哭吧。俺小白是这样理解的不知道各位大神
是怎么样理解的。
后来就重做redo日志，查看归档到8：20归档大概是37个 50mx37=1850m, 8:15是50mx27=1325m,  最后将redo大小设为1024m，也就是1G，
再后来重做redo已经做好了，但redo将近3个小时没有切换，手工切换正常，原来是开发大数据量已经做完了。 呵呵，苦逼了。
那怎么办呢，然后就找个开发和业务之间平衡点，然后又重做redo，将redo设定700m,在业务方面大概是15到25切一次，
开发大数据量大概是7分钟切一次。

上面是一些闲扯，俺小白，也不知道上面所做的是否合理，如果是大数据量都要每次重做redo吗，还是怎么着，带继续研究。

下面是重做redo全过程。大小为1024m的操作，700m的没有记录，操作方法一样只是改下redo大小


-rw-r----- 1 oracle oinstall 47512064 May  5 08:00 o1_mf_1_17287_djqj4l49_.arc
-rw-r----- 1 oracle oinstall 49789440 May  5 08:00 o1_mf_1_17288_djqj56f5_.arc
-rw-r----- 1 oracle oinstall 49543680 May  5 08:01 o1_mf_1_17289_djqj6k4k_.arc
-rw-r----- 1 oracle oinstall 50039808 May  5 08:01 o1_mf_1_17290_djqj7jg0_.arc
-rw-r----- 1 oracle oinstall 48469504 May  5 08:02 o1_mf_1_17291_djqj8f1r_.arc
-rw-r----- 1 oracle oinstall 48882688 May  5 08:02 o1_mf_1_17292_djqj9lmj_.arc
-rw-r----- 1 oracle oinstall 47800832 May  5 08:03 o1_mf_1_17293_djqjbh26_.arc
-rw-r----- 1 oracle oinstall 48790528 May  5 08:03 o1_mf_1_17294_djqjcdyq_.arc
-rw-r----- 1 oracle oinstall 50202624 May  5 08:04 o1_mf_1_17295_djqjdn8l_.arc
-rw-r----- 1 oracle oinstall 48251392 May  5 08:04 o1_mf_1_17296_djqjf9z0_.arc
-rw-r----- 1 oracle oinstall 50376704 May  5 08:05 o1_mf_1_17297_djqjgr0f_.arc
-rw-r----- 1 oracle oinstall 47847424 May  5 08:06 o1_mf_1_17298_djqjhfqt_.arc
-rw-r----- 1 oracle oinstall 48000000 May  5 08:06 o1_mf_1_17299_djqjjwvl_.arc
-rw-r----- 1 oracle oinstall 46934528 May  5 08:07 o1_mf_1_17300_djqjkpyj_.arc
-rw-r----- 1 oracle oinstall 49249280 May  5 08:08 o1_mf_1_17301_djqjm2qp_.arc
-rw-r----- 1 oracle oinstall 48714240 May  5 08:08 o1_mf_1_17302_djqjn8sn_.arc
-rw-r----- 1 oracle oinstall 50082304 May  5 08:09 o1_mf_1_17303_djqjok95_.arc
-rw-r----- 1 oracle oinstall 50543616 May  5 08:09 o1_mf_1_17304_djqjp9yo_.arc
-rw-r----- 1 oracle oinstall 50254336 May  5 08:10 o1_mf_1_17305_djqjqk57_.arc
-rw-r----- 1 oracle oinstall 50699264 May  5 08:11 o1_mf_1_17306_djqjro2z_.arc
-rw-r----- 1 oracle oinstall 48658432 May  5 08:11 o1_mf_1_17307_djqjsltc_.arc
-rw-r----- 1 oracle oinstall 50687488 May  5 08:12 o1_mf_1_17308_djqjtx8t_.arc
-rw-r----- 1 oracle oinstall 49117184 May  5 08:12 o1_mf_1_17309_djqjvoh3_.arc
-rw-r----- 1 oracle oinstall 48347648 May  5 08:13 o1_mf_1_17310_djqjx0yv_.arc
-rw-r----- 1 oracle oinstall 48188416 May  5 08:13 o1_mf_1_17311_djqjxt80_.arc
-rw-r----- 1 oracle oinstall 48316928 May  5 08:14 o1_mf_1_17312_djqjyqox_.arc
-rw-r----- 1 oracle oinstall 49675264 May  5 08:14 o1_mf_1_17313_djqjzx8p_.arc
-rw-r----- 1 oracle oinstall 49580032 May  5 08:15 o1_mf_1_17314_djqk14mw_.arc
-rw-r----- 1 oracle oinstall 50041344 May  5 08:16 o1_mf_1_17315_djqk2goo_.arc
-rw-r----- 1 oracle oinstall 50118656 May  5 08:16 o1_mf_1_17316_djqk3f8v_.arc
-rw-r----- 1 oracle oinstall 46252032 May  5 08:17 o1_mf_1_17317_djqk44vj_.arc
-rw-r----- 1 oracle oinstall 49716736 May  5 08:17 o1_mf_1_17318_djqk5gt5_.arc
-rw-r----- 1 oracle oinstall 50482688 May  5 08:18 o1_mf_1_17319_djqk6f6f_.arc
-rw-r----- 1 oracle oinstall 47356416 May  5 08:18 o1_mf_1_17320_djqk7jsl_.arc
-rw-r----- 1 oracle oinstall 49062400 May  5 08:19 o1_mf_1_17321_djqk8d2d_.arc
-rw-r----- 1 oracle oinstall 49636864 May  5 08:20 o1_mf_1_17322_djqk9ksp_.arc
-rw-r----- 1 oracle oinstall 50674688 May  5 08:20 o1_mf_1_17323_djqkbm5p_.arc
-rw-r----- 1 oracle oinstall 50206208 May  5 08:21 o1_mf_1_17324_djqkcn9v_.arc
-rw-r----- 1 oracle oinstall 49163776 May  5 08:21 o1_mf_1_17325_djqkdnq3_.arc
-rw-r----- 1 oracle oinstall 50273792 May  5 08:22 o1_mf_1_17326_djqkfx8l_.arc
-rw-r----- 1 oracle oinstall 49967104 May  5 08:22 o1_mf_1_17327_djqkgyyd_.arc
-rw-r----- 1 oracle oinstall 49219584 May  5 08:23 o1_mf_1_17328_djqkj864_.arc
-rw-r----- 1 oracle oinstall 48971776 May  5 08:24 o1_mf_1_17329_djqkkd3o_.arc
-rw-r----- 1 oracle oinstall 49022976 May  5 08:24 o1_mf_1_17330_djqklf9q_.arc
-rw-r----- 1 oracle oinstall 47977984 May  5 08:25 o1_mf_1_17331_djqkmor0_.arc
-rw-r----- 1 oracle oinstall 50620928 May  5 08:25 o1_mf_1_17332_djqknj90_.arc
-rw-r----- 1 oracle oinstall 46109184 May  5 08:26 o1_mf_1_17333_djqkoxkb_.arc
-rw-r----- 1 oracle oinstall 46856704 May  5 08:27 o1_mf_1_17334_djqkptnp_.arc
-rw-r----- 1 oracle oinstall 50667008 May  5 08:27 o1_mf_1_17335_djqkqth2_.arc
-rw-r----- 1 oracle oinstall 47429632 May  5 08:28 o1_mf_1_17336_djqks7dx_.arc
-rw-r----- 1 oracle oinstall 50085376 May  5 08:28 o1_mf_1_17337_djqktc9k_.arc
-rw-r----- 1 oracle oinstall 49784320 May  5 08:29 o1_mf_1_17338_djqkvdm5_.arc
-rw-r----- 1 oracle oinstall 49842688 May  5 08:30 o1_mf_1_17339_djqkwf9f_.arc
-rw-r----- 1 oracle oinstall 47106048 May  5 08:30 o1_mf_1_17340_djqkxj6f_.arc
一
1，查看redo我的是一个组是一个文件，有5个组 

SQL> select * from  v$logfile;

    GROUP# STATUS         TYPE
---------- -------------- --------------
MEMBER
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
IS_REC
------
         3                ONLINE
/oracle/app/oradata/shpog/redo03.log
NO

         2                ONLINE
/oracle/app/oradata/shpog/redo02.log
NO

    GROUP# STATUS         TYPE
---------- -------------- --------------
MEMBER
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
IS_REC
------

         1                ONLINE
/oracle/app/oradata/shpog/redo01.log
NO

         4                ONLINE
/oracle/app/oradata/shpog/redo04.log

    GROUP# STATUS         TYPE
---------- -------------- --------------
MEMBER
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
IS_REC
------
NO

         5                ONLINE
/oracle/app/oradata/shpog/redo05.log
NO

2，查看redo的大小是50m 
SQL> SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 CURRENT
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
3,redo路径 

SQL> SELECT group#,member FROM v$logfile;

    GROUP#
----------
MEMBER
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         3
/oracle/app/oradata/shpog/redo03.log

         2
/oracle/app/oradata/shpog/redo02.log

         1
/oracle/app/oradata/shpog/redo01.log


    GROUP#
----------
MEMBER
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
         4
/oracle/app/oradata/shpog/redo04.log

         5
/oracle/app/oradata/shpog/redo05.log


SQL> 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 CURRENT
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
4,切换日志到合适位置 
SQL> alter  system switch logfile;

System altered.

SQL> 
SQL> alter  system switch logfile;

System altered.

SQL> alter  system switch logfile;

System altered.

SQL> alter  system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 ACTIVE
         2          1         50 ACTIVE
         3          1         50 ACTIVE
         4          1         50 ACTIVE
         5          1         50 CURRENT

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 CURRENT
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE

5，检查点 
SQL> alter system checkpoint;

System altered.
SQL>
6 ，添加redo 6,7,8，三个redo组 

SQL> alter database add  logfile  group 6  '/oracle/app/oradata/shpog/redo03.log' size  1024M;
alter database add  logfile  group 6  '/oracle/app/oradata/shpog/redo03.log' size  1024M
*
ERROR at line 1:
ORA-01577: cannot add log file '/oracle/app/oradata/shpog/redo03.log' - file already part of database


SQL> alter database add  logfile  group 6  '/oracle/app/oradata/shpog/redo06.log' size  1024M;

Database altered.

SQL> alter database add  logfile  group 7  '/oracle/app/oradata/shpog/redo07.log' size  1024M;

Database altered.

SQL> 
SQL> alter database add  logfile  group 8  '/oracle/app/oradata/shpog/redo08.log' size  1024M;

Database altered.
7，查看redo 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 CURRENT
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 UNUSED
         7          1       1024 UNUSED
         8          1       1024 UNUSED

8 rows selected.

8，切换全部redo 

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> 
SQL> alter system switch logfile;

System altered.

SQL> 
SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 ACTIVE
         2          1         50 ACTIVE
         3          1         50 CURRENT
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 ACTIVE
         7          1       1024 ACTIVE
         8          1       1024 ACTIVE

8 rows selected.

9，检查点 


SQL> alter  system    checkpoint;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 CURRENT
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> 
SQL> 
SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 CURRENT
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 CURRENT
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 ACTIVE
         8          1       1024 CURRENT

8 rows selected.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 CURRENT
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> 
SQL> 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 CURRENT
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 CURRENT
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 CURRENT
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> 
SQL> 
SQL> alter system switch logfile;

System altered.

SQL> 
SQL> 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 CURRENT
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> 
SQL> 
SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 CURRENT
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.


10 ，将redo切换到合适位置 

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 ACTIVE
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 CURRENT
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

SQL> alter system checkpoint;

System altered.

SQL> 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1         50 INACTIVE
         2          1         50 INACTIVE
         3          1         50 INACTIVE
         4          1         50 INACTIVE
         5          1         50 INACTIVE
         6          1       1024 CURRENT
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.
11，删除redo 1,2,3,4,5 组 
SQL> alter  database drop  logfile group 1;

Database altered.

SQL> 
SQL> 
SQL> alter  database drop  logfile group 2;

Database altered.

SQL> alter  database drop  logfile group 3;

Database altered.

SQL> alter  database drop  logfile group 4;

Database altered.

SQL> alter  database drop  logfile group 5;

Database altered.

SQL> 
SQL> 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         6          1       1024 CURRENT
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         6          1       1024 ACTIVE
         7          1       1024 CURRENT
         8          1       1024 INACTIVE

SQL> alter system checkpoint;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         6          1       1024 INACTIVE
         7          1       1024 CURRENT
         8          1       1024 INACTIVE

SQL> 
SQL> 
SQL> exit 
Disconnected from Oracle Database 11g Release 11.2.0.1.0 - 64bit Production
[oracle@POGBAK ~]$ cd  /oracle/app/oradata/shpog/
[oracle@POGBAK shpog]$ ll
total 57750736
-rw-r----- 1 oracle oinstall    10862592 May  5 11:56 control01.ctl
-rw-r----- 1 oracle oinstall   104865792 May  5 11:56 example01.dbf
-rw-r----- 1 oracle oinstall    52429312 May  5 11:54 redo01.log
-rw-r----- 1 oracle oinstall    52429312 May  5 11:54 redo02.log
-rw-r----- 1 oracle oinstall    52429312 May  5 11:54 redo03.log
-rw-r----- 1 oracle oinstall    52429312 May  5 11:54 redo04.log
-rw-r----- 1 oracle oinstall    52429312 May  5 11:54 redo05.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 11:56 redo06.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 11:56 redo07.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 11:53 redo08.log
-rw-r----- 1 oracle oinstall  5368717312 May  5 11:56 sysaux01.dbf
-rw-r----- 1 oracle oinstall  4294975488 May  5 11:56 system01.dbf
-rw-r----- 1 oracle oinstall  3326091264 May  4 22:00 temp01.dbf
-rw-r----- 1 oracle oinstall  1745887232 May  5 11:56 undotbs01.dbf
-rw-r----- 1 oracle oinstall  2147491840 May  5 11:56 undotbs02.dbf
-rw-r----- 1 oracle oinstall 21474844672 May  5 11:56 users01.dbf
-rw-r----- 1 oracle oinstall 17179877376 May  5 11:56 users02.dbf
12，在系统上删除redo1,2,3,4,5 文件
[oracle@POGBAK shpog]$ rm -rf  redo01.log
[oracle@POGBAK shpog]$ rm -rf  redo02.log
[oracle@POGBAK shpog]$ rm -rf  redo03.log
[oracle@POGBAK shpog]$ rm -rf  redo04.log
[oracle@POGBAK shpog]$ rm -rf  redo05.log
13，重新创建redo 1,2,3,4,5 组 

SQL> alter database add logfile   group 1  '/oracle/app/oradata/shpog/redo01.log' size 1024M;

Database altered.

SQL> alter database add logfile   group 2  '/oracle/app/oradata/shpog/redo02.log' size 1024M;

Database altered.

SQL> alter database add logfile   group 3  '/oracle/app/oradata/shpog/redo03.log' size 1024M;

Database altered.

SQL> alter database add logfile   group 4  '/oracle/app/oradata/shpog/redo04.log' size 1024M;

Database altered.

SQL> alter database add logfile   group 5  '/oracle/app/oradata/shpog/redo05.log' size 1024M;

Database altered.

，切换到合适位置

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SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1       1024 ACTIVE
         2          1       1024 CURRENT
         3          1       1024 INACTIVE
         4          1       1024 INACTIVE
         5          1       1024 INACTIVE
         6          1       1024 INACTIVE
         7          1       1024 INACTIVE
         8          1       1024 INACTIVE

8 rows selected.

删除redo 6，7,8 
SQL> alter database drop  logfile  group 6;

Database altered.

SQL> alter database drop  logfile  group 7;

Database altered.

SQL> alter database drop  logfile  group 8;

Database altered.

SQL> 
SQL> 
SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1       1024 ACTIVE
         2          1       1024 CURRENT
         3          1       1024 INACTIVE
         4          1       1024 INACTIVE
         5          1       1024 INACTIVE

SQL> 
SQL> 
SQL> 
SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL> alter system switch logfile;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1       1024 CURRENT
         2          1       1024 ACTIVE
         3          1       1024 ACTIVE
         4          1       1024 ACTIVE
         5          1       1024 ACTIVE

17，检查点
SQL> alter system checkpoint;

System altered.

SQL>  SELECT group#, members, bytes/1024/1024 byte_mb, status FROM v$log;

    GROUP#    MEMBERS    BYTE_MB STATUS
---------- ---------- ---------- --------------------------------
         1          1       1024 CURRENT
         2          1       1024 INACTIVE
         3          1       1024 INACTIVE
         4          1       1024 INACTIVE
         5          1       1024 INACTIVE

SQL> 
SQL> 
SQL> 
SQL> exit 
Disconnected from Oracle Database 11g Release 11.2.0.1.0 - 64bit Production
[oracle@POGBAK shpog]$ 
[oracle@POGBAK shpog]$ 
[oracle@POGBAK shpog]$ 
[oracle@POGBAK shpog]$ 
[oracle@POGBAK shpog]$ ll
total 62737636
-rw-r----- 1 oracle oinstall    10862592 May  5 12:07 control01.ctl
-rw-r----- 1 oracle oinstall   104865792 May  5 12:06 example01.dbf
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:07 redo01.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:06 redo02.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:06 redo03.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:06 redo04.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:06 redo05.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:04 redo06.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:04 redo07.log
-rw-r----- 1 oracle oinstall  1073742336 May  5 12:04 redo08.log
-rw-r----- 1 oracle oinstall  5368717312 May  5 12:06 sysaux01.dbf
-rw-r----- 1 oracle oinstall  4294975488 May  5 12:06 system01.dbf
-rw-r----- 1 oracle oinstall  3326091264 May  4 22:00 temp01.dbf
-rw-r----- 1 oracle oinstall  1745887232 May  5 12:06 undotbs01.dbf
-rw-r----- 1 oracle oinstall  2147491840 May  5 12:06 undotbs02.dbf
-rw-r----- 1 oracle oinstall 21474844672 May  5 12:06 users01.dbf
-rw-r----- 1 oracle oinstall 17179877376 May  5 12:06 users02.dbf
18，在系统上删除redo 6,7,8文件
[oracle@POGBAK shpog]$ rm -rf  redo06.log
[oracle@POGBAK shpog]$ rm -rf  redo07.log
[oracle@POGBAK shpog]$ rm -rf  redo08.log
这样重做redo就做完了

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