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alter system set log_archive_dest=’D:\oracle\archivelog’ scope=spfile;
alter system set log_archive_start=true scope=spfile;
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SQL> archive log list 
Database log mode ¡¡¡¡¡¡¡¡¡¡¡¡No Archive Mode 
Automatic archival¡¡¡¡¡¡¡¡¡¡¡¡Disabled 
Archive destination¡¡¡¡¡¡¡¡¡¡ /export/home/oracle/product/8.1.7/dbs/arch 
Oldest online log sequence ¡¡ 28613 
Current log sequence¡¡¡¡¡¡¡¡¡¡28615 
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SQL> SELECT NAME,LOG_MODE from V$DATABASE; 
 
NAME¡¡¡¡¡¡¡¡LOG_MODE 
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log_archive_dest=/disk1/archive 
log_archive_duplex_dest=/disk2/archive 
 
b)LOG_ARCHIVE_DEST_n²ÎÊý 
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log_archive_dest_1=”LOCATION=/archive MANDATORY REOPEN” 
log_archive_dest_2=”SERVICE=standby_db1 MANDATORY REOPEN=600″ 
log_archive_dest_3=”LOCATION=/archive2 OPTIONAL” 
 
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oracle opatch ¹¤¾ßµÄʹÓÃ(oracleС²¹¶¡°²×°)

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´Ó9.2°æ¿ªÊ¼, Oracle¹«Ë¾Éè¼ÆÊµÏÖÁ˸ö±ð²¹¶¡"×°¹ÜÀí¹¤¾ßopatch. opatchʹÓÃÒ»¸ö³ÆÎªinventoryµÄϵͳÊý¾Ý½á¹¹(Ñϸñ˵ÊÇÓëoui¹²Ïíinventory), ¼¯ÖйÜÀíËùÓÐÒѰ²×°µÄ¸ö±ð²¹¶¡; ¸ö±ð²¹¶¡µÄ°²×°ºÍÐ¶ÔØ¶¼Ê¹ÓÃopatchÃüÁîÍê³É, ³åÍ»¼ì²âÒ²ÓÉopatchÔÚ°²×°Ê±×Ô¶¯Íê³É; ÌṩÁÐ ......

Êý¾Ý¿âtimestenÓë oracle ´¦ÀíÈÕÆÚÉÏд·¨ÉϵIJ»Í¬

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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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