📄 oracle sql性能优化系列 (一)1--acnow_net.htm
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<H1>ORACLE SQL性能优化系列 (一)</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> <BR><BR> <BR><BR>B. 两个语句所指的对象必须完全相同:<BR><BR>例如:<BR><BR> 用户 对象名 如何访问<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> 考虑一下下列SQL语句能否在这两个用户之间共享.<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>每个用户都有一个private synonym - sal_limit , 它们是不同的对象<BR><BR>select count(*0 from work_city where sdesc like 'NEW%';<BR><BR>能<BR><BR>两个用户访问相同的对象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>用户jack 通过private synonym访问plant_detail 而jill 是表的所有者,对象不同.<BR><BR> <BR><BR> <BR><BR> <BR><BR>C. 两个SQL语句中必须使用相同的名字的绑定变量(bind variables)<BR><BR> <BR><BR>例如：<BR><BR> <BR><BR>第一组的两个SQL语句是相同的(可以共享),而第二组中的两个语句是不同的(即使在运行时,赋于不同的绑定变量相同的值)<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> (待续)<BR><BR> <BR><BR> <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="164558059816455810544.shtml">1</a> <font color="red">2</font> </div></p>
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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性能优化系列 (二)">ORACLE SQL性能优化系列 (二)</a></td></tr>
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