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

oracleɾ³ý±íÖÐËùÓеÄÊý¾Ý

ʾÀýÒ»£ºdelete from emp;
ʵÀý¶þ£ºtruncate table emp;
µ±Ê¹ÓÃdeleteɾ³ýʱ£¬ËäȻɾ³ýÁ˱íÖеÄËùÓÐÊý¾Ý£¬µ«ÊÇûÓÐÊͷűíËùÕ¼µÄ¿Õ¼ä£¬Èç¹ûÓû§È·¶¨ÒªÉ¾³ý±íÖÐËùÓÐÊý¾Ý£¬Ê¹ÓÃʵÀý¶þÓï¾äËٶȸü¿ì¡£deleteÓï¾ä¿ÉÒÔ»ØÍË£¬µ«truncateÓï¾ä²Ù×÷²»ÄÜ»ØÍË£¬Ö´ÐеÄʱºòÒª¶à¼Ó×¢ÒâÕâÒ»µã¡£


Ïà¹ØÎĵµ£º

ÓëoracleÊý¾Ý¿âÁ¬½ÓÎÊÌâ

       Èç¹û²»ÊÇÒòΪÕâ´Î»»hisµÄ·þÎñÆ÷£¬¹À¼ÆÎÒÒ»Ö±Ò²²»»áÓöµ½Õâ¸öÎÊÌ⣬һֱ¾õµÃoracleºÜ¸ßÉ¶ÔËüҲûÓÐÑо¿£¬¿ÉÕâ´Î»»·þÎñÆ÷£¬Æ«Æ«ÈÃÎÒÓöµ½ÁËÒ»¸öÎÊÌ⣬ÕÛÄ¥ÁËÕûÕûÁ½Ì죬ÖÕÓÚÔÚ×òÌì½â¾öµôÁË£¬¼Ç¼ÏÂÀ´£¬ÒÔ±¸ÒÔºóËùÓá£
    ÖÜÎåÍíÉÏ»»ÁË·þÎñÆ÷£¬ÖÜÒ»ÔçÉÏ·¢ÏÖ³¬ÉùµÄ¹¤×÷Õ ......

oracle ÓÅ»¯Ö® ÕÒ³öµÍЧÂÊsql Óï¾ä

SELECT EXECUTIONS , DISK_READS, BUFFER_GETS,
¡¡¡¡ROUND((BUFFER_GETS-DISK_READS)/BUFFER_GETS,2) Hit_radio,
¡¡¡¡ROUND(DISK_READS/EXECUTIONS,2) Reads_per_run,
¡¡¡¡SQL_TEXT
¡¡¡¡from V$SQLAREA
¡¡¡¡WHERE EXECUTIONS>0
¡¡¡¡AND BUFFER_GETS > 0
¡¡¡¡AND (BUFFER_GETS-DISK_READS)/BUFFER_GETS ......

Oracle ÈÕÆÚʱ¼äº¯ÊýµÄÓ÷¨

   TO_DATE¸ñʽ 
Day: 
dd number 12 
dy abbreviated fri 
day spelled out friday 
ddspth spelled out, ordinal twelfth 
Month: 
mm number 03 
mon abbreviated mar 
month spelled out march 
Year: 
yy two digits 98  ......

oracleÖØÔØ²Ù×÷·ûµÄÀý×Ó

ת×Ô£ºhttp://download.oracle.com/docs/cd/B13789_01/server.101/b10759/statements_6004.htm
Creating User-Defined Operators: Example
This example creates a very simple functional implementation of equality and then creates an operator that uses the function:
CREATE FUNCTION eq_f(a VARCHAR2, b VARCHA ......

sql2005 Á´½Ó·þÎñÆ÷ Á¬½ÓOracle...

Ò»¡¢½¨Á¢Á´½Ó·þÎñÆ÷
       ÓÐÈËϲ»¶µ÷ÓÃϵͳ¹ý³ÌÀ´½¨Á¢£¬µ«ÎÒ¸öÈ˶Ôϵͳ¹ý³ÌûÓÐÌØ±ðµÄѧϰ £¬ËùÒÔÓõÄÊǽçÃæÉèÖ㬵±È»ÓÐÐËȤҲ¿ÉÒÔÑо¿Ò»Ïµģ¬ÒòΪ¿ÉÒÔ°ÑSQLÖ´Ðе¼³öÀ´¡£
USE [master]
GO
EXEC master.dbo.sp_addlinkedserver @server = N'TEST2', @srvproduct=N'ORCL', @provider=N ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ