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Oracle是一般大型企业使用的数据库，安全性高，数据库的语句其实都差不多，想要学Oracle数据库的朋友可以看看这个手册很有帮助的哦，目前我们现在使用的Oracle版本是10G
Oracle数据库10g是第一个为企业级网格计算而设计的数据库。Oracle数据库10g在Oracle 9i的基础上，提供了针对网格计算更多的特性，如更大的规模、可管理性、高可用性、业务智能等。
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:oracleoradblog');
c. sql> execute dbms_logmnr_add_logfile('c:oracleoradataoradb edo01.log',
sql> dbms_logmnr.new);
d. sql> execute dbms_logmnr.add_logfile('c:oracleoradataoradb edo02.log',
sql> dbms_logmnr.addfile);
e. sql> execute dbms_logmnr.start_logmnr(dictfilename=>'c:oracleoradblogoradb.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;
