RAC 中日誌組的添加、刪除、和修改

策略：每個組的日誌大小默認是50M每個，如果寫入或者更新很頻繁的庫，建議改大日誌文件的大小。

每個日誌組最好要有兩個以上的成員。

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select * from v$log ;

select * from v$logfile ;

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---刪除日誌組：

alter database drop logfile group 19;

alter system switch logfile;  ---日誌切換

alter system checkpoint ;  --- 將active 的日誌變爲 inactive

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---要求：每個節點6個組，每個組兩個成員

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--節點1：

/*alter database add logfile thread 1 group 19('+DATA_DG/querydb/redo19_1.log','+DATA_DG/querydb/redo19_2.log') size 1024m;

alter database add logfile thread 1 group 20('+DATA_DG/querydb/redo20_1.log','+DATA_DG/querydb/redo20_2.log') size 1024m;*/

alter database add logfile thread 1 group 1('+DATA_DG/querydb/redo01_1.log','+DATA_DG/querydb/redo01_2.log') size 1024m;

alter database add logfile thread 1 group 2('+DATA_DG/querydb/redo02_1.log','+DATA_DG/querydb/redo02_2.log') size 1024m;

alter database add logfile thread 1 group 3('+DATA_DG/querydb/redo03_1.log','+DATA_DG/querydb/redo03_2.log') size 1024m;

alter database add logfile thread 1 group 4('+DATA_DG/querydb/redo04_1.log','+DATA_DG/querydb/redo04_2.log') size 1024m;

alter database add logfile thread 1 group 5('+DATA_DG/querydb/redo05_1.log','+DATA_DG/querydb/redo05_2.log') size 1024m;

alter database add logfile thread 1 group 6('+DATA_DG/querydb/redo06_1.log','+DATA_DG/querydb/redo06_2.log') size 1024m;

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---節點2：

--alter database add logfile thread 2 group 7('+DATA_DG/querydb/redo07_1.log','+DATA_DG/querydb/redo07_2.log') size 1024m;

--alter database add logfile thread 2 group 8('+DATA_DG/querydb/redo08_1.log','+DATA_DG/querydb/redo08_2.log') size 1024m;

--alter database add logfile thread 2 group 9('+DATA_DG/querydb/redo09_1.log','+DATA_DG/querydb/redo09_2.log') size 1024m;

--alter database add logfile thread 2 group 10('+DATA_DG/querydb/redo10_1.log','+DATA_DG/querydb/redo10_2.log') size 1024m;

--alter database add logfile thread 2 group 11('+DATA_DG/querydb/redo11_1.log','+DATA_DG/querydb/redo11_2.log') size 1024m;

--alter database add logfile thread 2 group 12('+DATA_DG/querydb/redo12_1.log','+DATA_DG/querydb/redo12_2.log') size 1024m;

-----節點3：

/*alter database add logfile thread 3 group 13('+DATA_DG/querydb/redo13_1.log','+DATA_DG/querydb/redo13_2.log') size 1024m;

alter database add logfile thread 3 group 14('+DATA_DG/querydb/redo14_1.log','+DATA_DG/querydb/redo14_2.log') size 1024m;

alter database add logfile thread 3 group 15('+DATA_DG/querydb/redo15_1.log','+DATA_DG/querydb/redo15_2.log') size 1024m;

alter database add logfile thread 3 group 16('+DATA_DG/querydb/redo16_1.log','+DATA_DG/querydb/redo16_2.log') size 1024m;

alter database add logfile thread 3 group 17('+DATA_DG/querydb/redo17_1.log','+DATA_DG/querydb/redo17_2.log') size 1024m;

alter database add logfile thread 3 group 18('+DATA_DG/querydb/redo18_1.log','+DATA_DG/querydb/redo18_2.log') size 1024m;*/