📄 oracle sql性能优化系列 (十一)1--acnow_net.htm
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<H1>ORACLE SQL性能优化系列 (十一)</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> 2 1 TABLE ACCESS (BY INDEX ROWID) OF 'UNIONVSOR'<BR><BR> 3 2 INDEX (RANGE SCAN) OF 'UA' (NON-UNIQUE)<BR><BR> 4 1 TABLE ACCESS (BY INDEX ROWID) OF 'UNIONVSOR'<BR><BR> 5 4 INDEX (RANGE SCAN) OF 'UB' (NON-UNIQUE)<BR><BR>Statistics<BR><BR>----------------------------------------------------------<BR><BR> 0 recursive calls<BR><BR> 0 db block gets<BR><BR> 143 consistent gets<BR><BR> 0 physical reads<BR><BR> 0 redo size<BR><BR> 63749 bytes sent via SQL*Net to client<BR><BR> 7751 bytes received via SQL*Net from client<BR><BR> 68 SQL*Net roundtrips to/from client<BR><BR> 0 sorts (memory)<BR><BR> 0 sorts (disk)<BR><BR> 1003 rows processed<BR><BR> <BR><BR>SQL> select * from unionvsor /*3rd test*/<BR><BR> 2 where a = 1003<BR><BR> 3 union <BR><BR> 4 select * from unionvsor<BR><BR> 5 where b = 1;<BR><BR>1003 rows selected.<BR><BR>Execution Plan<BR><BR>----------------------------------------------------------<BR><BR> 0 SELECT STATEMENT Optimizer=CHOOSE<BR><BR> 1 0 SORT (UNIQUE)<BR><BR> 2 1 UNION-ALL<BR><BR> 3 2 TABLE ACCESS (BY INDEX ROWID) OF 'UNIONVSOR'<BR><BR> 4 3 INDEX (RANGE SCAN) OF 'UA' (NON-UNIQUE)<BR><BR> 5 2 TABLE ACCESS (BY INDEX ROWID) OF 'UNIONVSOR'<BR><BR> 6 5 INDEX (RANGE SCAN) OF 'UB' (NON-UNIQUE)<BR><BR>Statistics<BR><BR>----------------------------------------------------------<BR><BR> 0 recursive calls<BR><BR> 0 db block gets<BR><BR> 10 consistent gets <BR><BR> 0 physical reads<BR><BR> 0 redo size<BR><BR> 63735 bytes sent via SQL*Net to client<BR><BR> 7751 bytes received via SQL*Net from client<BR><BR> 68 SQL*Net roundtrips to/from client<BR><BR> 1 sorts (memory)<p><div align="right">本新闻共<font color=red>3</font>页,当前在第<font color=red>2</font>页 <a href="164559059816455975203.shtml">1</a> <font color="red">2</font> <a href="164559059816455975203_3.shtml">3</a> </div></p>
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上一篇：<a href='../../2005-4/29/164559059816455954036.shtml' title ='ORACLE常用傻瓜問題1000問(之五)'>ORACLE常用傻瓜問題1000問(之五)</a> 下一篇：<a href='../../2005-4/29/164559059816455980543.shtml' title ='ORACLE SQL性能优化系列 (十二)'>ORACLE SQL性能优化系列 (十二)</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/2005-4/29/16455905981645592205.shtml title="ORACLE SQL性能优化系列 (十三)">ORACLE SQL性能优化系列 (十三)</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/2005-4/29/164558059816455862139.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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