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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Autor</th> <th class="thCornerR">Wiadomość</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>lin22307</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="http://picsrv.fora.pl/xeon/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Wysłany: Czw 5:49, 31 Mar 2011<span class="gen"> </span> Temat postu: mbt chaussure Tree -based B ^ + relational databas</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">,<a href="http://www.mbtchaussuresparis.com" target="_blank" class="postlink">mbt chaussures paris</a> <br />Tree-based B ^ + relational database performance evaluation <br /> <br /> <br />Tree to the cost of the (1o) is given, put p; is the probability of sequential access. Then (1 a pt) is collapsing brake cable: visit probability, when the pan tie down system, the average H T. Is: once when the + (1 A p,) cfn. pl,, bl + (1 A p) b pd + (1 ~)} n ((-)+)) fI (c) joint care system overhead costs, including maintenance insert, delete, and modify the firm's marketing spend, when a system maintenance services occurs, the transaction for the insert transaction is defined as the probability p. , The probability for the stripping transactions, defined as the probability for the revision of services is defined as D. , Iol + pd + = 1. So for the system maintenance cost m: C = p. C, + Cd + pC = r. (+2) (+. S +<img src="http://picsrv.fora.pl/images/smiles/icon_smile.gif" alt="Smile" border="0" />+~(+ ≯ (ts ... 1 + (t ten;) (‰ -) a (H77, t) (+ Jo) (, pj +) t (16) (d) cost of poor efficiency of the foregoing analysis, the effective way to improve response time c 』=,<a href="http://www.hervelegertoronto.com" target="_blank" class="postlink">herve leger toronto</a>, i ~ - Self / 11I cable i brought the number of system maintenance, but also the increase in overhead. NiIg, ~, is to have minimum system maintenance. f under the conditions of sale the fastest response time, here we have to analyze the relationship between the two. Let the index obtained by the establishment of more efficient chip j said. should be equal to the response time of the order of access and use of the response index Time difference: E = c ridge of a first-class ((_72 l09u of Chongqing University, said queries with probability p, p. maintained that the probability, pJ, + p-l cost of using that efficiency is poor,<a href="http://www.mbtchaussure.org" target="_blank" class="postlink">mbt chaussure</a>, so there: paEP-pC, One analogy I (... and so JJIm a ~ N, 'rI ((1 a )+)|(+ three )(-~-] Og ​​(nd +1), etc.) (Qin + Ⅳ) seven for visual examples and results to express the efficiency cost of the number of poor relations with the index, may wish to give as a sample database and User Services: * number = l · database relationship between the number of attributes m = 30 · between the number of tuples N = 10000: · property {. A {f number of different values., = 1000O; · possession of a stored tuple contains the number of pages = 2 rank = 4 tree into the transaction to the database into a number of tuples r = l: ·, A ... in constraints in the probability P pi = 0.5; · delete the probability p =, insert the probability p = probability p. ==:~, will modify the above assumptions the value of Eq (6.4) 0J0 film of Jane, too: a 2500p a 2.7, o port-T5000p, a 2.7,<a href="http://www.mbtschoenenonlinekopen.net" target="_blank" class="postlink">mbt schoenen online kopen</a>, o. (1<img src="http://picsrv.fora.pl/images/smiles/icon_cool.gif" alt="Cool" border="0" /> l ship rate between the index price for poor and have Yongning 4: B-tree based on relational database performance evaluated according to equation (1<img src="http://picsrv.fora.pl/images/smiles/icon_cool.gif" alt="Cool" border="0" /> can draw the difference between the efficiency of generation of stool number and cable} 『curve, as shown. According to the figure of the curve. Xun out, such as F can be concluded: (a) of the query-based applications, using the index can significantly improve system performance. But the index number exceeds a certain limit, the system will not improve performance, but with the increase in the number of index decreased; (b) the probability of query and maintenance operations similar applications. use of the index can be to some extent, improve system performance, but the index is not appropriate to build; (c) to maintain the operation based on the application system,<a href="http://www.belstaffespana.net" target="_blank" class="postlink">Belstaff España</a>, can not be indexed. since the establishment of the system instead of cable 【performance. <br /> More articles related to topics： <br /> <br /> <br /> <a href="http://www.chiznews.com/oblog45/u/x9777763/archives/2011/921322.html" target="_blank" class="postlink">belstaff bolsas Accident _3799</a> <br /> <br /> <a href="http://disneyfc.forumup.vn/viewtopic.php?p=79166&mforum=disneyfc#79166" target="_blank" class="postlink">MBT Schuhe günstig Secret _42</a> <br /> <br /> <a href="http://pcosladies.forumup.us/viewtopic.php?p=92199&mforum=pcosladies#92199" target="_blank" class="postlink">belstaff bolsas Calculated the impact of discrete</a></span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="http://picsrv.fora.pl/xeon/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
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