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  • 修改oracle重做日志文件大小

    1. 创建3个新的日志组

    SQL> ALTER DATABASE ADD LOGFILE GROUP 4 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;

    SQL> ALTER DATABASE ADD LOGFILE GROUP 5 ('/u01/app/oracle/oradata/orcl/redo05.log') SIZE 500M;

    SQL> ALTER DATABASE ADD LOGFILE GROUP 6 ('/u01/app/oracle/oradata/orcl/redo06.log') SIZE 500M;

    查看日志组

    SQL> select * from v$logfile;

    2.切换当前日志到新的日志组

    SQL> alter system switch logfile;

    SQL> alter system switch logfile;

    SQL> alter system switch logfile;

    切到要删除为INCACTIVE才行

    SQL> select group#,sequence#,bytes,members,status from v$log;

        GROUP#  SEQUENCE#    BYTES    MEMBERS STATUS
    ---------- ---------- ---------- ---------- ----------------
      1   139 52428800   1 INACTIVE
      2   137 52428800   1 INACTIVE
      3   138 52428800   1 INACTIVE
      4   140  524288000   1 ACTIVE
      5   141  524288000   1 CURRENT
      6   136  524288000   1 INACTIVE

    3.删除旧的日志组

    SQL> alter database drop logfile group 1;

    Database altered.

    SQL> alter database drop logfile group 2;

    Database altered.

    SQL> alter database drop logfile group 3;

    查看是否删除了日志组

    SQL> select group#,sequence#,bytes,members,status from v$log;

        GROUP#  SEQUENCE#    BYTES    MEMBERS STATUS
    ---------- ---------- ---------- ---------- ----------------
      4   140  524288000   1 INACTIVE
      5   141  524288000   1 CURRENT
      6   136  524288000   1 INACTIVE

    4.操作系统删除原日志组1、2、3中的文件

    [oracle@oracle122 log]$ cd /u01/app/oracle/oradata/orcl
    [oracle@oracle122 orcl]$ 
    [oracle@oracle122 orcl]$ pwd
    /u01/app/oracle/oradata/orcl
    [oracle@oracle122 orcl]$ ls
    control01.ctl  example01.dbf  redo01.log  redo02.log  redo03.log  redo04.log  redo05.log  redo06.log  sysaux01.dbf  system01.dbf  temp01.dbf  undotbs01.dbf  users01.dbf
    [oracle@oracle122 orcl]$ rm -rf redo01.log 
    [oracle@oracle122 orcl]$ rm -rf redo02.log 
    [oracle@oracle122 orcl]$ rm -rf redo03.log

    5.重建日志组1、2、3

    SQL> ALTER DATABASE ADD LOGFILE GROUP 1 ('/u01/app/oracle/oradata/orcl/redo01.log') SIZE 500M;

    SQL> ALTER DATABASE ADD LOGFILE GROUP 2 ('/u01/app/oracle/oradata/orcl/redo02.log') SIZE 500M;

    SQL> ALTER DATABASE ADD LOGFILE GROUP 3 ('/u01/app/oracle/oradata/orcl/redo03.log') SIZE 500M;

    7.删除中间过渡用的日志组4、5、6 ,在删除时查询select group#,sequence#,bytes,members,status from v$log; 删除组是否为INACTIVE,如果不是INACTIVE 就要执行alter system switch logfile;

    查询看一下

    SQL> select group#,sequence#,bytes,members,status from v$log;

        GROUP#  SEQUENCE#    BYTES    MEMBERS STATUS
    ---------- ---------- ---------- ---------- ----------------
      1   148  524288000   1 CURRENT
      2   143  524288000   1 INACTIVE
      3   144  524288000   1 INACTIVE
      4   146  524288000   1 INACTIVE
      5   147  524288000   1 INACTIVE
      6   145  524288000   1 INACTIVE

    SQL> alter database drop logfile group 4;

    Database altered.

    SQL> alter database drop logfile group 5;

    Database altered.

    SQL> alter database drop logfile group 6;

    Database altered.

    8.到操作系统删除组4、5、6

    [oracle@oracle122 orcl]$ rm -rf redo04.log 
    [oracle@oracle122 orcl]$ rm -rf redo05.log 
    [oracle@oracle122 orcl]$ rm -rf redo06.log

    9.备份当前最新的控制文件

    SQL>  alter database backup controlfile to trace resetlogs  ;

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  • 原文地址:https://www.cnblogs.com/dyllove98/p/4097659.html
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