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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;
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insert into myt values('john',to_date(sysdate,'DD-MON-YY'));
insert into myt values('tom',to_date(sysdate,'DD-MON-YY'));
insert into myt values('lili',to_date(sysdate,'DD-MON-YY'));
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