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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/log4b.rdo') size 1m;
4.adding online redo log members
    sql>; alter database add logfile member
    sql>; '/disk3/log1b.rdo' to group 1,
    sql>; '/disk4/log2b.rdo' to group 2;
5.changes the name of the online redo logfile
    sql>; alter database rename file 'c:/oracle/oradata/oradb/redo01.log'
    sql>; to 'c:/oracle/oradata/redo01.log';
6.drop online redo log groups
    sql>; alter database drop logfile group 3;
7.drop online redo log members
    sql>; alter database drop logfile member 'c:/oracle/oradata/redo01.log';
8.clearing online redo log files
    sql>; alter database clear [unarchived] logfile 'c:/oracle/log2a.rdo';
9.using logminer analyzing redo logfiles
    a. in the init.ora specify utl_file_dir = ' '
    b. sql>; execute dbms_logmnr_d.build('oradb.ora','c:\oracle\oradb\log');
    c. sql>; execute dbms_logmnr_add_logfile('c:\oracle\oradata\oradb\redo01.log',
       sql>; dbms_logmnr.new);
    d. sql>; execute dbms_logmnr.add_logfile('c:\oracle\oradata\oradb\redo02.log',
       sql>; dbms_logmnr.addfile);
    e. sql>; execute dbms_logmnr.start_logmnr(dictfilename=>;'c:\oracle\oradb\log\oradb.ora');
    f. sql>; select * from v$logmnr_contents(v$logmnr_dictionary,v$logmnr_parameters
       sql>; v$logmnr_logs);
    g. sql>; execute dbms_logmnr.end_logmnr;
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1.create tablespaces
    sql>; create tablespace tablespace_name datafile