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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/lo ......

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     $ sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Dec 10 13:38 ......

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select dbtimezone from dual ;  --²é¿´Êý¾Ý¿âÊ±Çø
select sessiontimezone from dual ;  --²é¿´»á»°Ê±Çø
1.select u.name || '.' || o.name || '.' || c.name TSLTZcolumn
       from sys.obj$ o, sys.col$ c, sys.user$ u
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               ---select 'Hello World' from dual;     ---½á¹û£ºH ......

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