oracle 学习总结(性能优化).doc

oracle 学习总结(性能优化) oracle 学习总结（性能优化） 个人分类：oracle 学习总结（性能优化） create controlfile [reuse] [set] database 数据库名 logfile [group 整数] 文件名 [,[group 整数] 文件名],... 对于现有的数据库，可以间接地通过 alter database backup controlfile to trace命令生成控制文件，即可在\orant\rmb73\trace 下有ora00289.trc文件，其内容为文本 71、日志管理 1建立日志组 sqlselect * from v$logfile; sqlalter database add logfile group 3 (f:\orant\database\log1_g3.ora f:\orant\database\log2_g3.ora) size 100k; sqlselect * from v$logfile; ---- sql alter database add logfile group 4 (/disk3/log4a.rdo,/disk4/log4b.rdo) size 1m; 2删除日志组 alter database drop logfile group 1; 但是其物理文件并没有被删除掉 系统至少需要2个日志组，如果只有2个，就不能删除 不能删除正活动的日志组 3手工归档 通过alter system 的archive log 子句来实现 archive log [thread 整数] [seq 整数][change 整数][current][group 整数] [logfile 文件名][next][all][start][to 位置] 4 强制日志切换 sql alter system switch logfile; 5 强制checkpoints sql alter system checkpoint; 6 adding online redo log members sqlalter database add logfile member /disk3/log1b.rdo to group 1, /disk4/log2b.rdo to group 2; 7.changes the name of the online redo logfile sql alter database rename file c:/oracle/oradata/oradb/redo01.log to c:/oracle/oradata/redo01.log; 8 drop online redo log members sql alter database drop logfile member c:/oracle/oradata/redo01.log; 9.clearing online redo log files sql alter database clear [unarchived] logfile c:/oracle/log2a.rdo; 10.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; 72 系统控制 alter system ... alter system enable restr