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83.6c0 6.5 4.6 14.4 17.3 12.1C428.2 457.8 496 362.9 496 252C496 113.3 383.5 8 244.8 8M97.2 352.9c-1.3 1-1 3.3.7 5.2c1.6 1.6 3.9 2.3 5.2 1c1.3-1 1-3.3-.7-5.2c-1.6-1.6-3.9-2.3-5.2-1m-10.8-8.1c-.7 1.3.3 2.9 2.3 3.9c1.6 1 3.6.7 4.3-.7c.7-1.3-.3-2.9-2.3-3.9c-2-.6-3.6-.3-4.3.7m32.4 35.6c-1.6 1.3-1 4.3 1.3 6.2c2.3 2.3 5.2 2.6 6.5 1c1.3-1.3.7-4.3-1.3-6.2c-2.2-2.3-5.2-2.6-6.5-1m-11.4-14.7c-1.6 1-1.6 3.6 0 5.9s4.3 3.3 5.6 2.3c1.6-1.3 1.6-3.9 0-6.2c-1.4-2.3-4-3.3-5.6-2\"\u002F>",{"left":4,"top":4,"width":24,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":25},448,"\u003Cpath fill=\"currentColor\" d=\"M416 32H31.9C14.3 32 0 46.5 0 64.3v383.4C0 465.5 14.3 480 31.9 480H416c17.6 0 32-14.5 32-32.3V64.3c0-17.8-14.4-32.3-32-32.3M135.4 416H69V202.2h66.5V416zm-33.2-243c-21.3 0-38.5-17.3-38.5-38.5S80.9 96 102.2 96c21.2 0 38.5 17.3 38.5 38.5c0 21.3-17.2 38.5-38.5 38.5m282.1 243h-66.4V312c0-24.8-.5-56.7-34.5-56.7c-34.6 0-39.9 27-39.9 54.9V416h-66.4V202.2h63.7v29.2h.9c8.9-16.8 30.6-34.5 62.9-34.5c67.2 0 79.7 44.3 79.7 101.9z\"\u002F>",{"left":4,"top":4,"width":27,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":28},384,"\u003Cpath fill=\"currentColor\" d=\"M290.7 311L95 269.7L86.8 309l195.7 41zm51-87L188.2 95.7l-25.5 30.8l153.5 128.3zm-31.2 39.7L129.2 179l-16.7 36.5L293.7 300zM262 32l-32 24l119.3 160.3l32-24zm20.5 328h-200v39.7h200zm39.7 80H42.7V320h-40v160h359.5V320h-40z\"\u002F>",{"left":4,"top":4,"width":5,"height":5,"rotate":4,"vFlip":6,"hFlip":6,"body":30},"\u003Cpath fill=\"currentColor\" d=\"M5.202 2.857C7.954 4.922 10.913 9.11 12 11.358c1.087-2.247 4.046-6.436 6.798-8.501C20.783 1.366 24 .213 24 3.883c0 .732-.42 6.156-.667 7.037c-.856 3.061-3.978 3.842-6.755 3.37c4.854.826 6.089 3.562 3.422 6.299c-5.065 5.196-7.28-1.304-7.847-2.97c-.104-.305-.152-.448-.153-.327c0-.121-.05.022-.153.327c-.568 1.666-2.782 8.166-7.847 2.97c-2.667-2.737-1.432-5.473 3.422-6.3c-2.777.473-5.899-.308-6.755-3.369C.42 10.04 0 4.615 0 3.883c0-3.67 3.217-2.517 5.202-1.026\"\u002F>",{"left":4,"top":4,"width":24,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":32},"\u003Cpath fill=\"currentColor\" d=\"M433 179.11c0-97.2-63.71-125.7-63.71-125.7c-62.52-28.7-228.56-28.4-290.48 0c0 0-63.72 28.5-63.72 125.7c0 115.7-6.6 259.4 105.63 289.1c40.51 10.7 75.32 13 103.33 11.4c50.81-2.8 79.32-18.1 79.32-18.1l-1.7-36.9s-36.31 11.4-77.12 10.1c-40.41-1.4-83-4.4-89.63-54a102.5 102.5 0 0 1-.9-13.9c85.63 20.9 158.65 9.1 178.75 6.7c56.12-6.7 105-41.3 111.23-72.9c9.8-49.8 9-121.5 9-121.5m-75.12 125.2h-46.63v-114.2c0-49.7-64-51.6-64 6.9v62.5h-46.33V197c0-58.5-64-56.6-64-6.9v114.2H90.19c0-122.1-5.2-147.9 18.41-175c25.9-28.9 79.82-30.8 103.83 6.1l11.6 19.5l11.6-19.5c24.11-37.1 78.12-34.8 103.83-6.1c23.71 27.3 18.4 53 18.4 175z\"\u002F>",{"left":4,"top":4,"width":16,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":34},"\u003Cpath fill=\"currentColor\" d=\"M464 64H48C21.49 64 0 85.49 0 112v288c0 26.51 21.49 48 48 48h416c26.51 0 48-21.49 48-48V112c0-26.51-21.49-48-48-48m0 48v40.805c-22.422 18.259-58.168 46.651-134.587 106.49c-16.841 13.247-50.201 45.072-73.413 44.701c-23.208.375-56.579-31.459-73.413-44.701C106.18 199.465 70.425 171.067 48 152.805V112zM48 400V214.398c22.914 18.251 55.409 43.862 104.938 82.646c21.857 17.205 60.134 55.186 103.062 54.955c42.717.231 80.509-37.199 103.053-54.947c49.528-38.783 82.032-64.401 104.947-82.653V400z\"\u002F>",{"left":4,"top":4,"width":24,"height":16,"rotate":4,"vFlip":6,"hFlip":6,"body":36},"\u003Cpath fill=\"currentColor\" d=\"M128.081 415.959c0 35.369-28.672 64.041-64.041 64.041S0 451.328 0 415.959s28.672-64.041 64.041-64.041s64.04 28.673 64.04 64.041m175.66 47.25c-8.354-154.6-132.185-278.587-286.95-286.95C7.656 175.765 0 183.105 0 192.253v48.069c0 8.415 6.49 15.472 14.887 16.018c111.832 7.284 201.473 96.702 208.772 208.772c.547 8.397 7.604 14.887 16.018 14.887h48.069c9.149.001 16.489-7.655 15.995-16.79m144.249.288C439.596 229.677 251.465 40.445 16.503 32.01C7.473 31.686 0 38.981 0 48.016v48.068c0 8.625 6.835 15.645 15.453 15.999c191.179 7.839 344.627 161.316 352.465 352.465c.353 8.618 7.373 15.453 15.999 15.453h48.068c9.034-.001 16.329-7.474 16.005-16.504\"\u002F>",{"id":38,"title":39,"author":40,"body":41,"comments":268,"date":271,"dateModified":269,"description":272,"extension":273,"headings":274,"heroImage":284,"meta":285,"path":286,"permalink":286,"published":287,"stem":288,"tags":289,"timeToRead":292},"posts\u002Fposts\u002F2018\u002Foptimally-configuring-entity-framework-core\u002Findex.md","Optimally Configuring Entity Framework Core","Muhammad Rehan Saeed",{"type":42,"value":43,"toc":265},"minimark",[44,53,60,85,109,120,123,139,146,157,164,175,192,203,206,212,224,227,238,241,252,261],[45,46,47,48,52],"p",{},"Lets talk about configuring your Entity Framework Core ",[49,50,51],"code",{},"DbContext"," for a moment. There are several options you might want to consider turning on. This is how I configure mine in most micro services:",[54,55],"pre",{"className":56,"language":57,"meta":58,"style":58,"html":59},"language-cs shiki shiki-themes light-plus monokai","cs","","\u003Cspan class=\"line\">\u003Cspan class=\"sJvqV\">public\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> virtual\u003C\u002Fspan>\u003Cspan class=\"sJvqV\"> void\u003C\u002Fspan>\u003Cspan class=\"sWm5y\"> ConfigureServices\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sw29p\">IServiceCollection\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> services\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">) \u003C\u002Fspan>\u003Cspan class=\"snCLD\">=>\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">    services\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">AddDbContextPool\u003C\u002Fspan>\u003Cspan class=\"sjLUg\"><\u003C\u002Fspan>\u003Cspan class=\"sw29p\">MyDbContext\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">>(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">        options\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> options\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">UseSqlServer\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sK46n\">                this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">databaseSettings\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">ConnectionString\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">,\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sFrd5\">                x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">EnableRetryOnFailure\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">())\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">ConfigureWarnings\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">x\u003C\u002Fspan>\u003Cspan class=\"snCLD\"> =>\u003C\u002Fspan>\u003Cspan class=\"sFrd5\"> x\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">Throw\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">RelationalEventId\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">QueryClientEvaluationWarning\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">EnableSensitiveDataLogging\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sK46n\">this\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">hostingEnvironment\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">IsDevelopment\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">())\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"sjLUg\">            .\u003C\u002Fspan>\u003Cspan class=\"sWm5y\">UseQueryTrackingBehavior\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">(\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">QueryTrackingBehavior\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\u003C\u002Fspan>\u003Cspan class=\"sFrd5\">NoTracking\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">))\n\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"line\">\u003Cspan class=\"snCLD\">    ..\u003C\u002Fspan>\u003Cspan class=\"sjLUg\">.\n\u003C\u002Fspan>\u003C\u002Fspan>",[61,62,64,84],"h1",{"id":63},"enableretryonfailure",[65,66,69],"anchor-link",{"href":67,"label":68},"#enableretryonfailure","Link to this section",[70,71,78],"svg",{"xmlns":72,"xmlns:xlink":73,"viewBox":74,"version":75,"width":76,"height":76,"aria-hidden":77},"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg","http:\u002F\u002Fwww.w3.org\u002F1999\u002Fxlink","0 0 16 16","1.1",22,"true",[79,80],"path",{"fill":81,"fill-rule":82,"d":83},"currentColor","evenodd","M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z","EnableRetryOnFailure",[45,86,87,96,97,100,101,104,105,108],{},[88,89,84],"a",{"href":90,"rel":91,"target":95},"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Fef\u002Fcore\u002Fmiscellaneous\u002Fconnection-resiliency",[92,93,94],"nofollow","noopener","noreferrer","_blank"," enables retries for transient exceptions. So what is a transient exception? Entity Framework Core has a ",[49,98,99],{},"SqlServerTransientExceptionDetector"," class that defines that. It turns out that any ",[49,102,103],{},"SqlException"," with a very specific list of SQL error codes or ",[49,106,107],{},"TimeoutExceptions"," are considered transient exceptions and thus, safe to retry.",[61,110,112,119],{"id":111},"configurewarnings",[65,113,115],{"href":114,"label":68},"#configurewarnings",[70,116,117],{"xmlns":72,"xmlns:xlink":73,"viewBox":74,"version":75,"width":76,"height":76,"aria-hidden":77},[79,118],{"fill":81,"fill-rule":82,"d":83},"ConfigureWarnings",[45,121,122],{},"By default, Entity Framework Core will log warnings when it can't translate your C# LINQ code to SQL and it will evaluate parts of your LINQ query it does not understand in-memory. This is usually catastrophic for performance because this usually means that EF Core will retrieve a huge amount of data from the database and then filter it down in-memory.",[45,124,125,126,129,130,132,133,135,136,138],{},"Luckily in EF Core 2.1, they added support to translate the ",[49,127,128],{},"GroupBy"," LINQ method to SQL. However, I found out yesterday that you have to write Where clauses after ",[49,131,128],{}," for this to work. If you write the Where clause before your ",[49,134,128],{},", EF Core will evaluate your ",[49,137,128],{}," in-memory in the client instead of in SQL. The key is to know when this is happening.",[45,140,141,142,145],{},"One thing you can do is throw an exception when you are evaluating a query in-memory instead of in SQL. That is what Throw on ",[49,143,144],{},"QueryClientEvaluationWarning"," is doing.",[61,147,149,156],{"id":148},"enablesensitivedatalogging",[65,150,152],{"href":151,"label":68},"#enablesensitivedatalogging",[70,153,154],{"xmlns":72,"xmlns:xlink":73,"viewBox":74,"version":75,"width":76,"height":76,"aria-hidden":77},[79,155],{"fill":81,"fill-rule":82,"d":83},"EnableSensitiveDataLogging",[45,158,159,163],{},[88,160,156],{"href":161,"rel":162,"target":95},"https:\u002F\u002Fdocs.microsoft.com\u002Fen-us\u002Fdotnet\u002Fapi\u002Fmicrosoft.entityframeworkcore.dbcontextoptionsbuilder.enablesensitivedatalogging?view=efcore-2.1",[92,93,94]," enables application data to be included in exception messages. This can include SQL, secrets and other sensitive information, so I am only doing it when running in the development environment. It's useful to see warnings and errors coming from Entity Framework Core in the console window when I am debugging my application using the Kestrel webserver directly, instead of with IIS Express.",[61,165,167,174],{"id":166},"usequerytrackingbehavior",[65,168,170],{"href":169,"label":68},"#usequerytrackingbehavior",[70,171,172],{"xmlns":72,"xmlns:xlink":73,"viewBox":74,"version":75,"width":76,"height":76,"aria-hidden":77},[79,173],{"fill":81,"fill-rule":82,"d":83},"UseQueryTrackingBehavior",[45,176,177,178,180,181,183,184,186,187,191],{},"If you are building an ASP.NET Core API, each request creates a new instance of your ",[49,179,51],{}," and then this is disposed at the end of the request. Query tracking keeps track of entities in memory for the lifetime of your ",[49,182,51],{}," so that if they are updated any changes can be saved, this is a waste of resources if you are just going to throw away the ",[49,185,51],{}," at the end of the request. 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