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

sqlÓÅ»¯É¨Ã¤

1.oracleɨÃèµÄ˳ÐòΪ´Óϵ½ÉÏ£¬´ÓÓÒµ½×ó
           ËùÒÔÎÒÃÇÒª¾¡¿ÉÄܵİÑÊý¾ÝÉٵıí·ÅÔÚºóÃæ£¬½»²æ±í·ÅÔÚºóÃæ£¬×îÄܹýÂ˵ÄÌõ¼þ·ÅÔÚºóÃæ
2.²»ÒªÔÚË÷ÒýÉÏʹÓüÆËãºÍnot²Ù×÷·û
           Ë÷ÒýÒ»µ©²ÎÓë¼ÆËã»òʹÓÃÁËnot²Ù×÷·û£¬oracle½«»áºöÂÔÕâ¸öË÷Òý
3.¾¡Á¿Ê¹ÓÃinºÍand£¬¾¡Á¿±ÜÃâʹÓÃor£¬or»á²úÉú´óÁ¿µÄ¹ýÂË £¬Ö±½Óµ¼ÖÂÂß¼­¶Á´óÁ¿Ôö¼Ó
4.±ØÒªÊ±Ê¹ÓÃautotrace(sqlplusÖÐÓÐЧ£¬PL/SQLÖÐÎÞЧ)
           ÃüÁset autotrace on;
           ¹æÔò£º¾¡Á¿¼õÉÙÂß¼­¶Á£¬Ó¦¸Ã±ÜÃâÎïÀí¶Á£¬Ìá¸ß»º³åÇøÃüÖÐÂÊ £¬×îºÃ±£³ÖÔÚ95%ÒÔÉÏ¡£
           recursive calls      µÝ¹éµ÷ÓÃ
           db block gets       Êý¾Ý¿é¶ÁÈ¡
           consistent gets    Ò»ÖÂÐÔ¶ÁÈ¡
           physical reads      ÎïÀí¶ÁÈ¡
           redo size              ²úÉúµÄÖØ×öÈÕÖ¾´óС
Âß¼­¶Á=consistent gets + db block gets
»º³åÇøÃüÖÐÂÊ=(Âß¼­¶Á-ÎïÀí¶Á)/Âß¼­¶Á
Ò»¸ö½ø³Ì¿ÉÄܶÔÒÔºóÄܹ»Êý¾Ý¿éÖжà¸ösession¡£
sqlÓÅ»¯×îÖØ³£ÓõÄÊǰ취ÊÇ£ºÉóÊÓsqlÓï¾ä
Ò²¿ÉÒÔÖ´ÐÐÕâÌõsqlÀ´²éÕҷdz£ºÄ·Ñ¿Õ¼äµÄsql£º
select sql_text ,sharable_mem from v$sql where sharable_mem > '100000' order by sharable_mem ;


Ïà¹ØÎĵµ£º

SQL²éÑ¯ÖØ¸´Êý¾ÝºÍÇå³ýÖØ¸´Êý¾Ý


ÓÐÀý±í£ºemp
emp_no   name    age    
    001           Tom      17    
    002       &nb ......

SQLÓ¦ÓÃÈÕÖ¾

UPDATe [Sale_Goods]  SET [Catalog33_ID] = [Catalog].[ID]
from  [Sale_Goods]
LEFT OUTER JOIN [chdy222] ON [Sale_Goods].[Code] = [chdy222].[ID]
LEFT OUTER JOIN [Catalog] ON [chdy222].[ufidaname] = [Catalog].[Name] and [Catalog].[Type]=33
WHERE [Catalog].[ID] IS NOT NULL ......

SQL SERVER2000´ò²¹¶¡ÎÊÌâ»ã×Ü

SQL SERVER2000´ò²¹¶¡ÎÊÌâ»ã×Ü ¡¾http://hi.baidu.com/yanhai/blog/item/cf67c2ce07a9f50992457e9d.html¡¿
SQL ServerµÄ²¹¶¡°æ±¾¼ì²é²»ÈçWindows ²¹¶¡°æ±¾¼ì²éÖ±½Ó£¬Ò»¸öϵͳ¹ÜÀíÔ±£¬Èç¹û²»Á˽âSQL Server°æ±¾¶ÔÓ¦µÄ²¹¶¡ºÅ£¬¿ÉÄÜÒ²»áÓöµ½Ò»µãÂé·³£¬Òò´ËÔÚÕâ˵Ã÷һϣ¬Í¨¹ýÕâÑùµÄ°ì·¨Åбð»úÆ÷Êǰ²È«µÄ°ì·¨£¬²»»á¶Ôϵͳ²úÉúÈ ......

sql server 2005µÄsaÕ˺ÅÃÜÂëÍü¼ÇÁËÔõô°ì

¾ßÌå½â¾ö²½Öè:
µÚÒ»²½:´ò¿ª SQL2005 ÓùÜÀíÔ±µÇ¼ÏÈ,È»ºóÔÚ·þÎñÃû´¦ÓÒ»÷Ñ¡ÊôÐÔ>°²È«ÐÔ>ÓұߵĵǼ·½Ê½Ñ¡Ïî¸ÄΪ Éí·ÝÑéÖ¤ È·¶¨!
µÚ¶þ²½:Ñ¡Ôñ°²È«ÐÔ(Õ¹¿ª)>µÇ¼Ãû>Ë«»÷sa>ÃÜÂë¸Ä³ÉÄãÐèÒªµÄÃÜÂë È·¶¨!
È»ºó¹ØµôSQL2005 »òÕß ¶Ï¿ªÁ¬½Ó
µÚÈý²½:µã¿ªÊ¼>³ÌÐò>Ñ¡ÔñSQL2005>ÅäÖù¤¾ß>´ò¿ª configurat ......

Pl/sql µÄ×Ô¶¯ÌáʾºÍÌá½»£¨commit£©

×Ô¶¯ÌáʾµÄ¿ì½Ý¼ü£ºF6
¿ÉÒÔ¸ü¸Ä£ºTools->Preferences->User interface->Key Configuration ,ÔÚItemÁÐÀïÕÒµ½“Tools/Code Assistant”,ÔÚºóÃæ¶ÔÓ¦µÄ¿ì½Ý¸Ä³É×Ô¼ºÏ²»¶µÄ¡£
ĬÈÏÊDz»ÄÜ×Ô¶¯Ìá½»µÄ£¬°´ F10 ¼ü¿ÉÒÔÔÚ×ö¸ü¸ÄºóÌá½»¡£ ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ