-------8月在gx行做的，按照行内标准，实现了将原50M每组共5个redolog日志组重建成100M每组共10组。

1 查看目前的redolog日志组，得知在用的为group4

SQL> select group#,members,bytes/1024/1024,status from v$log;

GROUP#    MEMBERS BYTES/1024/1024 STATUS

---------- ---------- --------------- ----------------

1          2              50 INACTIVE

2          2              50 INACTIVE

3          2              50 INACTIVE

4          2              50 CURRENT

5          2              50 INACTIVE

2新增group6-10日志组，大小为100m

alter database add logfile thread 1 group 6('/oradata/CCFICBC/redo06.log','/oradata/CCFICBCredo/redo06b.log') size 100m;

alter database add logfile thread 1 group 7('/oradata/CCFICBC/redo07.log','/oradata/CCFICBCredo/redo07b.log') size 100m;

alter database add logfile thread 1 group 8('/oradata/CCFICBC/redo08.log','/oradata/CCFICBCredo/redo08b.log') size 100m;

alter database add logfile thread 1 group 9('/oradata/CCFICBC/redo09.log','/oradata/CCFICBCredo/redo09b.log') size 100m;

alter database add logfile thread 1 group 10('/oradata/CCFICBC/redo10.log','/oradata/CCFICBCredo/redo10b.log') size 100m;

3 drop掉group1235日志组，因为group4在用，所以需要先切换日志组。切完后用查状态语句确认group4不在用，然后再drop .

alter database drop logfile group 1;

alter database drop logfile group 2;

alter database drop logfile group 3;

alter database drop logfile group 5;

alter system switch logfile;

select group#,members,bytes/1024/1024,status from v$log;

alter database drop logfile group 4;

4在操作系统层面上删除日志文件

rm /oradata/CCFICBC/redo01.log

rm /oradata/CCFICBCredo/redo01b.log

rm /oradata/CCFICBC/redo02.log

rm /oradata/CCFICBCredo/redo02b.log

rm /oradata/CCFICBC/redo03.log

rm /oradata/CCFICBCredo/redo03b.log

rm /oradata/CCFICBC/redo05.log

rm /oradata/CCFICBCredo/redo05b.log

rm /oradata/CCFICBC/redo04.log

rm /oradata/CCFICBCredo/redo04b.log

5再重新建立group1-5组，大小为100M

alter database add logfile thread 1 group 1('/oradata/CCFICBC/redo01.log','/oradata/CCFICBCredo/redo01b.log') size 100m;

alter database add logfile thread 1 group 2('/oradata/CCFICBC/redo02.log','/oradata/CCFICBCredo/redo02b.log') size 100m;

alter database add logfile thread 1 group 3('/oradata/CCFICBC/redo03.log','/oradata/CCFICBCredo/redo03b.log') size 100m;

alter database add logfile thread 1 group 4('/oradata/CCFICBC/redo04.log','/oradata/CCFICBCredo/redo04b.log') size 100m;

alter database add logfile thread 1 group 5('/oradata/CCFICBC/redo05.log','/oradata/CCFICBCredo/redo05b.log') size 100m;

6用此语句确认完成

SQL>  select group#,members,bytes/1024/1024,status from v$log;

GROUP#    MEMBERS BYTES/1024/1024 STATUS

---------- ---------- --------------- ----------------

1          2             100 CURRENT

2          2             100 UNUSED

3          2             100 UNUSED

4          2             100 UNUSED

5          2             100 UNUSED

6          2             100 INACTIVE

7          2             100 ACTIVE

8          2             100 UNUSED

9          2             100 UNUSED

10          2             100 UNUSED