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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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create pfile from 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
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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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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 ......