ORACLE redo日誌組添加方法

alter database add logfile thread 1  group 1 size 512M;
alter database add logfile thread 2  group 2 size 512M;
alter database add logfile thread 1  group 3 size 512M;
alter database add logfile thread 2  group 4 size 512M;
alter database add logfile thread 1  group 5 size 512M;
alter database add logfile thread 2  group 6 size 512M;
alter database add logfile thread 1  group 7 size 512M;
alter database add logfile thread 2  group 8 size 512M;
alter database add logfile thread 1  group 9 size 512M;
alter database add logfile thread 2  group 10 size 512M;

alter database add logfile thread 1 size 512M;
alter database add logfile thread 2 size 512M;
alter database add logfile thread 1 size 512M;
alter database add logfile thread 2 size 512M;
alter database add logfile thread 1 size 512M;
alter database add logfile thread 2 size 512M;

alter database drop logfile group 1;
alter database drop logfile group 2;
alter database drop logfile group 3;
alter database drop logfile group 4;

alter database drop logfile group 11;
alter database drop logfile group 12;
alter database drop logfile group 13;
alter database drop logfile group 14;
alter database drop logfile group 15;
alter database drop logfile group 16;
alter database drop logfile group 17;
alter database drop logfile group 18;
alter database drop logfile group 19;
alter database drop logfile group 20;
alter database drop logfile group 21;
alter database drop logfile group 22;