tsql - Simple SQL Server queries taking forever when variables/functions are involved -


this i've been struggling while found way around it. have fact table in sql server dw has around 30m records, , integer field called datecreatedkey has non-clustered index on field. have function called dbo.fn_datekeyfromdate quite simply

declare @ret int = year(@date) * 10000 + month(@date) * 100 + day(@date)  return @ret

as see execution times below, if index doesn't work when using function or when using variable. not sure if i'm missing obvious?

now these execution times each of these 5 blocks of code:

  • a: 0.034s:

    select  *     #subs2    biwarehouse.dbo.factsubscriptions (nolock)    datecreatedkey >= 20170814

  • b: 15.4s:

    declare @fromdate int select  @fromdate = 20170814  select  *     #subs3    biwarehouse.dbo.factsubscriptions (nolock)    datecreatedkey >= @fromdate

  • c: 134s:

    select  *     #subs4    biwarehouse.dbo.factsubscriptions (nolock)    datecreatedkey >= dbo.fn_datekeyfromdate(getdate()-1)

  • d: 20s:

    declare @fromdate int select  @fromdate = dbo.fn_datekeyfromdate(getdate()-1)  select  *     #subs     biwarehouse.dbo.factsubscriptions (nolock)    datecreatedkey >= @fromdate

i indexes doesn't used when calling function, should work variable. compare execution plans sure.

try if want use function (maybe idea 130s example?):

declare @fromdate int select  @fromdate = dbo.fn_datekeyfromdate(getdate()-1)  select  *     #subs     biwarehouse.dbo.factsubscriptions (nolock)    datecreatedkey >= @fromdate

Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more