日志管理

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;