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select name,log_mode from v$database;
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1. SQL> alter system set log_archive_dest_1='location=/oracle/oracle10g/log/archive_log';
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SQL>alter system set log_archive_dest_2='location=/oracle/oracle10g/log2/archive_log';

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SQL> alter system set log_archive_max_processes = 5;
SQL> alter system set log_archive_format = "archive_%t_%s_%r.log" scope=spfile;

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