¡¾Ô´´¡¿oracleµÄ¹éµµÄ£Ê½
	
    
    
	Ò»¡£²é¿´oracleÊý¾Ý¿âÊÇ·ñΪ¹éµµÄ£Ê½£º
1.select name,log_mode from v$database;
NAME               LOG_MODE
------------------ ------------------------
QUERY           NOARCHIVELOG
2.ʹÓÃARCHIVE LOG LIST ÃüÁî
Database log mode              No Archive Mode
Automatic archival             Disabled
Archive destination            /data/oracle/product/10.2.0/db_1//dbs/arch
Oldest online log sequence     739
Current log sequence           741
¶þ¡£Ê²Ã´ÊÇOracle¹éµµÄ£Ê½£¿
¡¡¡¡OracleÊý¾Ý¿âÓÐÁª»úÖØ×öÈÕÖ¾£¬Õâ¸öÈÕÖ¾ÊǼǼ¶ÔÊý¾Ý¿âËù×öµÄÐ޸쬱ÈÈç²åÈ룬ɾ³ý£¬¸üÐÂÊý¾ÝµÈ£¬¶ÔÕâЩ²Ù×÷¶¼»á¼Ç¼ÔÚÁª»úÖØ×öÈÕÖ¾Àï¡£Ò»°ãÊý¾Ý¿âÖÁÉÙÒªÓÐ2¸öÁª»úÖØ×öÈÕÖ¾×é¡£µ±Ò»¸öÁª»úÖØ×öÈÕÖ¾×鱻дÂúµÄʱºò£¬¾Í»á·¢ÉúÈÕÖ¾Çл»£¬ÕâʱÁª»úÖØ×öÈÕÖ¾×é2³ÉΪµ±Ç°Ê¹ÓõÄÈÕÖ¾£¬µ±Áª»úÖØ×öÈÕÖ¾×é2дÂúµÄʱºò£¬ÓֻᷢÉúÈÕÖ¾Çл»£¬È¥Ð´Áª»úÖØ×öÈÕÖ¾×é1£¬¾ÍÕâÑù·´¸´½øÐС£
¡¡¡¡Èç¹ûÊý¾Ý¿â´¦Óڷǹ鵵ģʽ,Áª»úÈÕÖ¾ÔÚÇл»Ê±¾Í»á¶ªÆú. ¶øÔڹ鵵ģʽÏ£¬µ±·¢ÉúÈÕÖ¾Çл»µÄʱºò£¬±»Çл»µÄÈÕÖ¾»á½øÐй鵵¡£±ÈÈ磬µ±Ç°ÔÚʹÓÃÁª»úÖØ×öÈÕÖ¾1£¬µ±1дÂúµÄʱºò£¬·¢ÉúÈÕÖ¾Çл»£¬¿ªÊ¼Ð´Áª»úÖØ×öÈÕÖ¾2£¬ÕâʱÁª»úÖØ×öÈÕÖ¾1µÄÄÚÈݻᱻ¿½±´µ½ÁíÍâÒ»¸öÖ¸¶¨µÄĿ¼Ï¡£Õâ¸öĿ¼½Ð×ö¹éµµÄ¿Â¼£¬¿½±´µÄÎļþ½Ð¹éµµÖØ×öÈÕÖ¾¡£
¡¡¡¡Êý¾Ý¿âʹÓù鵵·½Ê½ÔËÐÐʱ²Å¿ÉÒÔ½øÐÐÔÖÄÑÐÔ»Ö¸´¡£
1.¹éµµÈÕ־ģʽºÍ·Ç¹éµµÈÕ־ģʽµÄÇø±ð
·Ç¹éµµÄ£Ê½Ö»ÄÜ×öÀ䱸·Ý,²¢ÇÒ»Ö¸´Ê±Ö»ÄÜ×öÍêÈ«±¸·Ý.×î½üÒ»´ÎÍêÈ«±¸·Ýµ½ÏµÍ³³ö´íÆÚ¼äµÄÊý¾Ý²»Äָܻ´.
¹éµµÄ£Ê½¿ÉÒÔ×öÈȱ¸·Ý,²¢ÇÒ¿ÉÒÔ×öÔöÁ¿±¸·Ý,¿ÉÒÔ×ö²¿·Ö»Ö¸´.
ÓÃARCHIVE LOG LIST ¿ÉÒԲ鿴ÆÚģʽ״̬ʱ¹éµµÄ£Ê½»¹ÊǷǹ鵵ģʽ.
Èý¡£ÅäÖÃÊý¾Ý¿âµÄ¹éµµÄ£Ê½
¸Ä±ä·Ç¹éµµÄ£Ê½µ½¹éµµÄ£Ê½:
1)SQL>SHUTDOWN NORMAL/IMMEDIATE;
2)SQL>START MOUNT;
3)SQL>ALTER DATABASE ARCHIVELOG;
4)SQL>ALTER DATABASE OPEN;
5)SQL>×öÒ»´ÎÍêÈ«±
    
     
	
	
    
    
	Ïà¹ØÎĵµ£º
        
    
    ÆÀ¹ÀÊý¾Ý¸ßËÙ»º´æÐ§ÂʵÄÖ¸±êÊÇÃüÖÐÂÊ¡£¸ÃÃüÖÐÂÊͨ¹ý²éѯV$SYSSTAT ºÍ$BUFFER_POOL_STATISTICSÊÓͼ¿ÉÒԵõ½¡£Õâ¸öÊÓͼ¿ÉÒÔ
²éѯÿ¸ö»º´æ³Ø¸÷×ÔµÄÃüÖÐÂÊ¡£»º´æ³ØµÄÃüÖÐÂʵļÆËã²ÉÓÃÏÂÃæµÄ¹«Ê½:
   1-(physical_reads/(db_block_gets+consistent_gets))
   ÏÂÃæµÄSQLÓï¾ä³£ÓÃÀ´²éѯµ±Ç°¸÷¸ö»º´æ³ØµÄÃüÖ ......
	
    
        
    
    
´øUNION ALLÎﻯÊÓͼµÄ¿ìËÙË¢ÐÂ
1.   ¶¨ÒåµÄ²éѯµÄunion all²Ù×÷±ØÐëÔÚ×î¶¥µÈ¼¶£¨²éÑ¯ÖØÐ´ºó£©
2.   ÎﻯÊÓͼÈÕÖ¾Ö¸¶¨rowidºÍincluding new values
3.   Èç¹û±íÉèÉæ¼°µ½Ò»¸ö´óÁ¿µÄinsert»òÕßÖ±½Ó·¾¶¼ÓÔØ£¬deletes,update£¬Ö¸¶¨sequencea
4.   fromÁбí ......
	
    
        
    
    select  s.username,  
  decode(l.type,'TM','TABLE  LOCK',  
                              'TX','ROW  LOCK',  
 & ......
	
    
        
    
    ¼×¹ÇÎÄÒѾÍê³ÉÁ˶ÔSUN¹«Ë¾µÄÊÕ¹º£¬ÓÚ1ÔÂ27ÈÕ·¢²¼Á˶ÔSun¸÷ÏîÒµÎñµÄÕûºÏ¹æ»®¡£×ÜÌåÉÏ˵£¬OracleÒª³ÉΪÈíÓ²¼þÒ»Ì廯µÄÕûÌå½â¾ö·½°¸µÄ³§ÉÌ¡£ ÒÔÏÂ¾ÍÆä¶Ô±¸ÊܹØ×¢µÄJava·½ÃæµÄ²ßÂÔ×ö¸ö½éÉÜ¡£ 
Java SE: 
1£©ÍƳöJDK SE 7£¬ Ëü½«°üÀ¨¶à¸öÐµĹ¦ÄÜ£¬ÈçÌá¸ß¿ª·¢ÈËÔ±µÄЧÂÊ£¬Ìṩ¸ßÐÔÄÜ£¬¶Ô¶àºËоƬµÄÖ§³ÖµÈ¡£ 
2£©SunµÄHotSpot ......