SQL Commads for manage log files

Chapter 1 Management of logfile

1. forcing log switch
sql> alter system switch logfile;

2. forcing checkpoints
sql> alter system checkpoint;

3. adding online redolog 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
sql> 'c:/oracle/oradata/redo01.log';

8. clearing online redo log files
sql> alter database clear [unarchived] logfile
sql> '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, dbms_logmnr.new);
(d) sql> execute dbms_logmnr.add_logfile('c:\oracle\oradata\oradb\redo02.log', 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$logmnr_parameters, v$logmnr_logs);
(g) sql> execute dbms_logmnr.end_logmnr;