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<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>I hope someone can give as
some help about this issue. We are trying to optimize <span class=SpellE>mnesia</span>
access time, to phone tariff tables.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>This tariff tables, have about
4000 entries each.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><span
style='mso-spacerun:yes'> </span>The index is a <span class=SpellE>tuple</span>
key as follows:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>{“<span class=SpellE>Tariff_Table_Name”,”Prefix</span>”}<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=GramE><b style='mso-bidi-font-weight:normal'><font
size=3 face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt;
mso-ansi-language:EN-GB;font-weight:bold;mso-bidi-font-weight:normal'>where</span></font></b></span><b
style='mso-bidi-font-weight:normal'><span lang=EN-GB style='mso-ansi-language:
EN-GB;font-weight:bold;mso-bidi-font-weight:normal'> </span></b><span
lang=EN-GB style='mso-ansi-language:EN-GB'><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=3 face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;mso-ansi-language:EN-GB'>Tariff_Table_Name</span></font></span><span
lang=EN-GB style='mso-ansi-language:EN-GB'>, is the name of the Tariff plan
that applies to the subscriber<o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB;font-weight:bold'>And<o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>Prefix, is a string, the first
digits of the called number. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>So our queries are (Tariff
Table Name=”TARIFF”):<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><font size=2 face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;mso-ansi-language:EN-GB'>MatchHead</span></font></span><font
size=2 face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
mso-ansi-language:EN-GB'> = #<span class=SpellE><span class=GramE>tarifftable</span></span><span
class=GramE>{</span><span class=SpellE>tarifftablekey</span>='$1', _='_'},<br>
Guard = [{'=='<span class=GramE>,{</span>element,1,'$1'},
"TARIFF"}],<br>
Result = '$1',<br>
Select = <span class=GramE>fun(</span>) -><br>
<span class=SpellE><span class=GramE>mnesia:</span>select</span>(<span
class=SpellE>tarifftable</span>,[{<span class=SpellE>MatchHead</span>, Guard,
[Result]}])<br>
<span class=GramE>end</span>,<br>
<br>
{<span class=GramE>atomic</span>, <span class=SpellE>Res</span>} = <span
class=SpellE>mnesia<span class=GramE>:transaction</span></span>(Select),<br>
<span class=GramE>Res.</span><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>So, as a result, it brings
4000 <span class=SpellE>tuples</span>, of the form “{“<span
class=SpellE>Tariff_Table_Name”,”Prefix</span>”}<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>Later the application searches
for the “prefix” that better <span class=SpellE>martches</span> the
called number (the prefix is a substring of the called number). My question is,
instead of bringing all 4000 <span class=SpellE>tuples</span>, can I bring just
the most similar “Prefix”, like the one which have <span
class=GramE>an</span> specific first <span class=SpellE>caracter</span>? So
instead of bringing 4000 <span class=SpellE>tuples</span>, I may bring just the
most similar ones (the prefixes which are more similar to the destination
number?)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'>Best Regar</span></font><st1:PersonName><span
lang=EN-GB style='mso-ansi-language:EN-GB'>ds</span></st1:PersonName><span
lang=EN-GB style='mso-ansi-language:EN-GB'>,<o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><span class=SpellE><span class=GramE><font size=3
face="Times New Roman"><span lang=EN-GB style='font-size:12.0pt;mso-ansi-language:
EN-GB'>daniel</span></font></span></span><span lang=EN-GB style='mso-ansi-language:
EN-GB'><o:p></o:p></span></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt;mso-ansi-language:EN-GB'><o:p> </o:p></span></font></p>
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