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     $ sqlplus '/as sysdba'
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Dec 10 13:38:57 2009
Copyright (c) 1982, 2005, Oracle.  All rights reserved.
Connected to an idle instance.
SQL> startup;
ORACLE instance started.
Total System Global Area 5016387584 bytes
Fixed Size                  2027744 bytes
Variable Size             922750752 bytes
Database Buffers         4076863488 bytes
Redo Buffers               14745600 bytes
Database mounted.
Database opened.
SQL> archive log list;
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     62
Current log sequence           64
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 5016387584 bytes
Fixed Size                  2027744 bytes
Variable Size             922750752 bytes
Database Buffers         4076863488 bytes
Redo Buffers      


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redhat enterprise linux5.4 °²×° oracle 11g R2

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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 ......

oracle DBTIMEZONEÊ±Çøµ÷Õû

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
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