📄 oracle sql性能优化系列 (二)1--acnow_net.htm
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<H1>ORACLE SQL性能优化系列 (二)</H1>
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<TD align=middle height=20>http://Tech.acnow.net 2005-4-29 <FONT color=#a20010>网络</FONT></TD>
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<TD class=l17><FONT class=f14 id=zoom><BR><BR> FROM EMP <BR><BR> WHERE EMP_NO = 291;<BR><BR> <BR><BR>方法2 (次低效)<BR><BR> <BR><BR> DECLARE <BR><BR> CURSOR C1 (E_NO NUMBER) IS <BR><BR> SELECT EMP_NAME,SALARY,GRADE<BR><BR> FROM EMP <BR><BR> WHERE EMP_NO = E_NO;<BR><BR> BEGIN <BR><BR> OPEN C1(342);<BR><BR> FETCH C1 INTO …,..,.. ;<BR><BR> …..<BR><BR> OPEN C1(291);<BR><BR> FETCH C1 INTO …,..,.. ;<BR><BR> CLOSE C1;<BR><BR> END;<BR><BR> <BR><BR> <BR><BR> <BR><BR> <BR><BR> <BR><BR>方法3 (高效)<BR><BR> <BR><BR> SELECT A.EMP_NAME , A.SALARY , A.GRADE,<BR><BR> B.EMP_NAME , B.SALARY , B.GRADE<BR><BR> FROM EMP A,EMP B<BR><BR> WHERE A.EMP_NO = 342<BR><BR> AND B.EMP_NO = 291;<BR><BR> <BR><BR> <BR><BR>注意:<BR><BR> 在SQL*Plus , SQL*Forms和Pro*C中重新设置ARRAYSIZE参数, 可以增加每次<a href="/Html/DataBase/" target="_blank">数据库</a>访问的检索数据量 ,建议值为200<BR><BR> <BR><BR>(待续)<BR><p><div align="right">本新闻共<font color=red>2</font>页,当前在第<font color=red>2</font>页 <a href="164558059816455862139.shtml">1</a> <font color="red">2</font> </div></p>
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上一篇：<a href='../../2005-4/29/164558059816455811533.shtml' title ='在DB2中如何實現Oracle的相關功能(三)'>在DB2中如何實現Oracle的相關功能(三)</a> 下一篇：<a href='../../2005-4/29/164558059816455883761.shtml' title ='ORACLE9I中外部表的使用'>ORACLE9I中外部表的使用</a>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164558059816455850688.shtml title="ORACLE SQL性能优化系列 (六)">ORACLE SQL性能优化系列 (六)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164558059816455833067.shtml title="ORACLE SQL性能优化系列 (七)">ORACLE SQL性能优化系列 (七)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164558059816455832996.shtml title="ORACLE SQL性能优化系列 (四)">ORACLE SQL性能优化系列 (四)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164559059816455944859.shtml title="ORACLE SQL性能优化系列 (十)">ORACLE SQL性能优化系列 (十)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164559059816455975203.shtml title="ORACLE SQL性能优化系列 (十一)">ORACLE SQL性能优化系列 (十一)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164558059816455832430.shtml title="ORACLE SQL性能优化系列 (九)">ORACLE SQL性能优化系列 (九)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164558059816455831878.shtml title="ORACLE SQL性能优化系列 (五)">ORACLE SQL性能优化系列 (五)</a></td></tr>
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<td><img src="http://tech.acnow.net/Files/Img/list_nav_spacer.gif"><a Class="a2" href= http://tech.acnow.net/Html/DataBase/Oracle/2005-4/29/164559059816455960820.shtml title="ORACLE SQL性能优化系列 (十四) 完结篇">ORACLE SQL性能优化系列 (十四) 完结篇</a></td></tr>
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