?? oracle sql性能優(yōu)化系列 (一)1--acnow_net.htm
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<H1>ORACLE SQL性能優(yōu)化系列 (一)</H1>
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<TD align=middle height=20>http://Tech.acnow.net 2005-4-29 <FONT color=#a20010>網絡</FONT></TD>
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<TD class=l17><FONT class=f14 id=zoom><BR><BR> <BR><BR> <BR><BR>B. 兩個語句所指的對象必須完全相同:<BR><BR>例如:<BR><BR> 用戶 對象名 如何訪問<BR><BR>Jack sal_limit private synonym<BR><BR> Work_city public synonym<BR><BR> Plant_detail public synonym<BR><BR> <BR><BR>Jill sal_limit private synonym<BR><BR> Work_city public synonym<BR><BR> Plant_detail table owner<BR><BR> <BR><BR> 考慮一下下列SQL語句能否在這兩個用戶之間共享.<BR><BR> <BR><BR> <BR><BR>SQL<BR><BR>能否共享<BR><BR>原因<BR><BR>select max(sal_cap) from sal_limit;<BR><BR>不能<BR><BR>每個用戶都有一個private synonym - sal_limit , 它們是不同的對象<BR><BR>select count(*0 from work_city where sdesc like 'NEW%';<BR><BR>能<BR><BR>兩個用戶訪問相同的對象public synonym - work_city <BR><BR>select a.sdesc,b.location from work_city a , plant_detail b where a.city_id = b.city_id<BR><BR>不能<BR><BR>用戶jack 通過private synonym訪問plant_detail 而jill 是表的所有者,對象不同.<BR><BR> <BR><BR> <BR><BR> <BR><BR>C. 兩個SQL語句中必須使用相同的名字的綁定變量(bind variables)<BR><BR> <BR><BR>例如：<BR><BR> <BR><BR>第一組的兩個SQL語句是相同的(可以共享),而第二組中的兩個語句是不同的(即使在運行時,賦于不同的綁定變量相同的值)<BR><BR>a.<BR><BR>select pin , name from people where pin = :blk1.pin;<BR><BR>select pin , name from people where pin = :blk1.pin;<BR><BR> <BR><BR>b.<BR><BR>select pin , name from people where pin = :blk1.ot_ind;<BR><BR>select pin , name from people where pin = :blk1.ov_ind;<BR><BR> <BR><BR> <BR><BR> <BR><BR> (待續(xù))<BR><BR> <BR><BR> <BR><p><div align="right">本新聞共<font color=red>2</font>頁,當前在第<font color=red>2</font>頁 <a href="164558059816455810544.shtml">1</a> <font color="red">2</font> </div></p>
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上一篇：<a href='../../2005-4/29/164558059816455822988.shtml' title ='在DB2中如何實現(xiàn)Oracle的相關功能(二)'>在DB2中如何實現(xiàn)Oracle的相關功能(二)</a> 下一篇：<a href='../../2005-4/29/164558059816455811533.shtml' title ='在DB2中如何實現(xiàn)Oracle的相關功能(三)'>在DB2中如何實現(xiàn)Oracle的相關功能(三)</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/2005-4/29/164558059816455862139.shtml title="ORACLE SQL性能優(yōu)化系列 (二)">ORACLE SQL性能優(yōu)化系列 (二)</a></td></tr>
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