Performance problems in SQL Server -


i´m trying sql sentence works fine (i think) have performance problem, takes 32 minutes execute, , think can poor code, can 1 me how improve it?

this code:

select distinct      s.nombre, l.nomcli cli,     (select max(lineas.fecalb)        lineas       lineas.codart = s.codart , lineas.codcli = l.codcli) fecha,    (select max(proveedores.nombre)      proveedores      proveedores.codpro = s.codpro) proveedor, (select max(lineas.codrep) lineas lineas.codart=s.codart) representante  stock s  inner join lineas l on s.codart=l.codart    s.codart in(select lineas.codart lineas inner join stock on   lineas.codart=stock.codart datediff("d",lineas.fecalb,getdate())<365 , stock.stoexi>0 group lineas.codart having count(lineas.codart)<=2  )and   (s.codart in(  select st.codart stock st st.codart not in  (select lineas.codart lineas  datediff("d",lineas.fecalb,getdate())<=60) , st.stoexi>0)  or s.codart in (select lineas.codart lineas  datediff("d",lineas.fecalb,getdate())<182 group lineas.codart having count(lineas.codart)<=2 , (s.stoexi>0)) or s.codart in (select lineas.codart lineas  datediff("d",lineas.fecalb,getdate())<=182 group lineas.codart having sum(lineas.unidad)<s.stoexi))  order s.nombre,l.nomcli desc ;

first have more or less same sentence without first condition

 s.codart in (select lineas.codart                lineas                inner join stock on lineas.codart = stock.codart                datediff("d", lineas.fecalb, getdate()) < 365                  , stock.stoexi > 0                group lineas.codart                having count(lineas.codart) <= 2) ,

works fine takes 18 seconds.

the líneas table have 600000 rows , stock 53000

in condition calculating datediff each record. database won't able use index field, field isn't compared specific value. instead should calculate point in time compare field to.

instead of:

datediff("d",lineas.fecalb,getdate())<182

try:

lineas.fecalb >= dateadd("d", -182, getdate())

your use of distinct means run subqueries more times need, discard duplicates. should try first filter out records want result for, can run subqueries on that.


Comments

Post a Comment

Popular posts from this blog

javascript - Using jquery append to add option values into a select element not working -

i'm looking dynamically populate select element names of items stored array. for reason it's not working , i'm not sure why. html: <div class="col-md-4 col-md-offset-4"> <select class="select1"> </select> , <select class="select2"> </select> </div> note i'm using bootstrap layout. here's jquery i'm using try , populate ".select1" jquery: select: function() { $.each(state.greens, function(index, value) { $(".select1").append("<option value =' " + index + " '>" + state.greens[index].name + "</option>"); }); } note function 'select' stored within object called 'display'. state.greens name of array i'm trying access. so @ end of html page call display.select(); call function. no error messages showing in console. also, saw question: appending
Read more

Android soft keyboard reverts to default keyboard on orientation change -

i'm building android soft keyboard , can't seem fix bug - have arabic , qwerty keyboard , when rotate device on qwerty keyboard (or arabic shift), it's if program has "restarted" , becomes arabic keyboard without shift. the onsaveinstancestate(bundle savedinstancestate) not work because application not extend activity inputmethodservice . i put following in android manifest android:configchanges="keyboard|keyboardhidden|orientation" android:windowsoftinputmode="stateunchanged|adjustresize"> i tried using @override public void onconfigurationchanged(configuration newconfig) { super.onconfigurationchanged(newconfig); log.i(mydebug, "config changed " + currentkeyboard.equals(qwerty)); } however, currentkeyboard.equals(qwerty)) results false , made sure true before orientation change. any appreciated. i think applications fault. if application restarting on orientation change
Read more

jquery - javascript onscroll fade same class but with different div -

i new @ javascript , want learn new. there wrong code : why div fades @ same time. i want ask how fade different div s same class name.can me , explain me. thanks in advance. javascript: $(window).scroll(function(){ if ($( "div.fade" ).offset().top - $(window).scrolltop() <= 100){ $('.fade').addclass( "fade-in"); } else { $('.fade').removeclass("fade-in"); } }); here jsfiddle onscroll = function () { var scrolltop = $(this).scrolltop() ; $("div.fade").each(function(){ if(($(this).offset().top - scrolltop) <= 100){ $(this).toggleclass("fade-in"); } }) }
Read more