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oracle 常用命令第一章：日志管理 　　1.forcing log switches 　　sql> alter system switch logfile; 　　2.forcing checkpoints 　　sql> alter system checkpoint; 　　3.adding online redo log groups 　　sql> alter database add logfile [group 4] 　　sql> ('/disk3/log4a.rdo','/disk4/log4b.rdo') size 1m; 　　4.adding online redo log members 　　sql> alter database add logfile member 　　sql&