Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

ORACLE È¥³ýÖØ¸´¼Ç¼

      delete from tbl_talbe
      where (col1,col2,col3) in
     (select col1,col2,col3
       from tbl_table
       group by col1,col2,col3
       having count(*)>1)
     and rowid not in
     (
        select max(rowid)
        from tbl_table
        group by col1,col2,col3
        having count(*) >1
     )
    


Ïà¹ØÎĵµ£º

OracleÊý¾Ý¿â»ñÈ¡µ±Ç°Óû§Á¬½ÓÊýµÄsqlÓï¾ä

¾ßÌåʵÏÖÈçÏ£º
SQL> select count(*) from v$session  #Á¬½ÓÊý
SQL> Select count(*) from v$session where status='ACTIVE'¡¡#²¢·¢Á¬½ÓÊý
SQL> show parameter processes  #×î´óÁ¬½Ó
SQL> alter system set processes = value scope = spfile;ÖØÆôÊý¾Ý¿â  #ÐÞ¸ÄÁ¬½Ó ......

Oracle ¹«²¼ Java ·¢Õ¹²ßÂÔ

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 ......

java¶àÏ̱߳£´æoracleµÄblob×Ö¶ÎÔÚ±¾µØÉú³ÉͼÏñ

ǰЩÈÕ×ÓÕÛÌÚµÄÔÚÏßÅÄÕÕ£¬ÓÉÓÚÖ»ÊǸüÐÂblob×ֶΣ¬Ã»ÓÐÔÚ±¾µØ±£´æÕÕÆ¬£¬µ¼Ö¿ͻ§ÅÄÄÔÃÅÏëÒªµÄʱºò²»ÄÜÂíÉÏÄóöÀ´¡£Ã»ËµµÄË­Èù˿ÍÊÇÉϵÛÄØ£¬×ö°É¡£Ê¹ÓÃÏ̳߳ش´½¨Èý¸öÏß³ÌÈÃ×Ô¶¨Ò»¸öÏß³ÌÄ¿±ê¹²Ïí£¨Ò²¾ÍÊǰѱíÀïµÄ¼Ç¼·Ö³Én×éͬʱִÐе¼³ö£©¡£³ÌÐòºÜ¼òµ¥£¬Ò»¹²ËĸöÀàºÍÒ»¸öojdbc14.jar°ü¡£ÓÉÓÚsqlÓï¾äд´íÁËÔì³É¶à¸öÏ̶߳ÔÒ»¸ ......

oracleµÄociºÍthinÇø±ð

1£©´ÓʹÓÃÉÏÀ´Ëµ£¬oci±ØÐëÔÚ¿Í»§»úÉϰ²×°oracle¿Í»§¶Ë»ò²ÅÄÜÁ¬½Ó£¬¶øthin¾Í²»ÐèÒª£¬Òò´Ë´ÓʹÓÃÉÏÀ´½²thin»¹ÊǸü¼Ó·½±ã£¬ÕâÒ²ÊÇthin±È½Ï³£¼ûµÄÔ­Òò¡£
2£©Ô­ÀíÉÏÀ´¿´£¬thinÊÇ´¿javaʵÏÖtcp/ipµÄc/sͨѶ£»¶øoci·½Ê½,¿Í»§¶Ëͨ¹ýnative java methodµ÷ÓÃc library·ÃÎÊ·þÎñ¶Ë£¬¶øÕâ¸öc library¾ÍÊÇoci(oracle called interface ......

oracle ´¥·¢Æ÷

Create [or replace] trigger [ģʽ.]´¥·¢Æ÷Ãû
       Before| after |instead of  insert|delete|(update of ÁÐÃû)
       {insert|delete|(update of ÁÐÃû) }
On ±íÃû|ÊÓͼ|ģʽÃû|Êý¾Ý¿âÃû
[for each row]
When Ìõ¼þ
PL/SQL¿é
˵Ã÷£º
......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ