Entity framework slow Feb 5, 2015 · Entity Framework Code-First too slow at startup. NET Code (25 seconds for those same 30,000) Context Bloat- Keep the active Context Graph small by using a new context for each Unit of Work (same 30,000 inserts take 33 seconds) Feb 1, 2017 · Here is my setup: Compiling at . DetectChanges is an expensive operation, so that's the reason why Find is slower (but it might become faster if the entity is already loaded into the context because Find would not run a query but just return the loaded entity). This design makes life easier but slowdown simple operations. Entity framework very slow to load for first time. MyEntities. The count operation is obviously where records are materialized and therefore the slowest of operations to take place. May 18, 2022 · I am implementing a Database First Entity Framework 6. 2 extreme slow. 0 (I can't go any higher than this) Using EntityFramework against Oracle 11gR2 database Using ODP. Jul 31, 2014 · Hi I am using an entity framework object context's ExecuteStoredQuery to run a stored procedure. NET provider with invariant name 'System. Is Entity Framework as slow as some people report it? Yes and no. microsoft. Fortunately, Nov 23, 2015 · Entity Framework query is super slow. Painfully slow Azure table insert and delete batch operations. com. NET 11. Failure to do this will result in an exception. Entity Framework async operation takes ten times as long to complete; Answer. EF6/Code First: Super slow during the 1st query, but only in Debug. 80% of the time of this event handler is spend on this call. These are right up to a certain point as LINQ comes with its own penalties. 0. Attach(myEntity); // Code to walk the entity graph and set each entity's state // using ObjectStateManager omitted for clarity . These can be used to map a database schema to domain objects in any object-oriented language. You can debug the SQL commands (which shouldn't differ between debug and release mode) using the ObjectSet<T>. Entity framework performance slow. 7. See full list on learn. Usually you have to select entity, make modification/delete and SaveChanges. May 1, 2013 · I'm using EF5 and attaching a disconnected graph of POCO entities to my context, something like this:-using (var context = new MyEntities()) { context. Jun 24, 2014 · public class Entity { public int Id { get; set; } public string Field1 { get; set; } public string Field2 { get; set; } } I want to show these in a grid, paged as 100,000 is far too many to show on one screen (and not very efficient). Sep 14, 2017 · Very very slow Entity Framework Execution Of Query. The SomeStringProp column in the database was a varchar, but EF assumes that . Entity Framework - Bulk update/insert/delete slowness. Sep 12, 2021 · EF Core is designed to modify database only via Change Tracker. ConnectionString)); Oct 3, 2012 · I am calling a stored procedure (that returns data) from Entity Framework using the query below from sp in db. 0 and . Jul 20, 2019 · How to get the most performance out of Entity Framework. I am using the below code: Feb 26, 2023 · Entity Framework Include performance; Entity-framework code is slow when using Include() many times; Entity Framework . What could this be? Nov 6, 2012 · I've been doing a lot of research on Entity Framework recently and something that keeps bothering me is its performance when the queries are not warmed-up, so called cold queries. Each collection has about two to three objects. GroupBy() running extremely slow. NET 4. Feb 25, 2023 · Improve Entity Framework Performance. Sep 25, 2018 · Adding to the answer given by @rducom here and @ChrisPratt. Net Core 3. Ask Question Asked 9 years, 10 months ago. It's too easy to fall into a Entity Framework performance pitfall. I went through the performance considerations article for Entity Framework 5. Nov 7, 2016 · Entity Framework - Initial Save is slow. AutoDetectChangesEnabled = false; context. Clean Code in C# “Any fool can write code that a computer can understand. If you want an abstraction over that, introduce a service layer. Apr 7, 2022 · Very very slow Entity Framework Execution Of Query. Entity Framework 6. Startup time here is the time to perform the first operation on a DbContext when that DbContext type is used for the first time in the application. The asynchronous version will always be slower than the synchronous version when there is no concurrency. Aug 9, 2021 · My application is in . 2. SaveChange() takes longer time at first call. I think something is not optimized how they handle data in memory. EF6 takes 5 mins to run query on less then 40,000 records. Currently it's known to execute N + 1 subqueries when the query contains sub collection projection. Entity Framework 6 work on both . 20 Using Visual Studio 2012 Ultimate and Oracle Entity Framework slow after upgrade from EF4 to EF6 (EntityFramework. Entity Framework query is super slow. Entity Framework Core: performance issue. 1. I learned that manually 'resetting' a couple of files, then proceeding through the GUI update squared me away quickly. What you need to do to solve your issue is reducing the number of database round-trips. Nov 16, 2010 · Since this is entity framework, open up the sql profiler and take a look at what sql queries are being sent to the database. The resulting translation process during the query for the DB to do the comparison is what takes a long time. 1 to insert about 2000 master/detail collections to SQL server db. It turns out it's an issue of SQL data types. Write; // Your code here Feb 16, 2015 · Because I got a link to this question a couple of days ago I decided to post a small update. 0) and . 0. 1 and I use Entity Framework Core 5. NET string types are nvarchars. There is one gotcha with this code. Jan 30, 2021 · Entity Framework 6. SQL Server Entity Framework GetAll() is too slow. But considering the most popular OLTP scenarios, a big obstacle is the lack of correct and accurate cache invalidation. ASP. If you are dealing with data 1MB< this issue is still present in Microsoft. Database. Entity Framework 6 is an out of band release and does not depend on the Entity Framework components that ship with . Dec 22, 2011 · I am using entity framework to retrieve a large dataset. NET / EF Core. 7. It sounds like you may see that a single query is sent to fetch the group identifiers, and then another set of queries (one for each group) might be fetching the count. Configuration. The dataset set has a parent/child relationship, and I need to bring back the child information at the same time as the parent. Dec 19, 2020 · Is EF Core slowing down your . Entry(entity). Nov 22, 2015 · I suggest start monitoring the query generated by Entity Framework, it's very simple, you just need to set Log function of your context and see the results, using (var context = new MyContext()) { context. But the problem and the performance bottleneck is in the translation from your LINQ query into SQL. 3. Entity Framework performance problems. The code consists of 2 statements: IEnumerable<int> Aug 7, 2015 · Entity Framework 6. Jul 20, 2017 · This is just a guess, but have you tried running a second equivalent query through Entity Framework after already completing the first query, then timing that to see if it's closer to the raw SQL time? This answer and others indicate that Entity Framework is slow to execute the first query because it has the overhead of building out the model Feb 14, 2021 · I need to perform a count operation on this Entity Framework (EF6) data set using a relatively complex expression as a WHERE clause and expecting it to return about 100k records. NET. I took my highly developed test application I use to compare database access technologies and a small console application to double check. Log = Console. Net application? In this article, I’ll show you how to analyze and improve Entity Framework performance using small examples and a monitoring tool. Very very slow Entity Framework Execution Of Query. – Apr 18, 2019 · Here is an example of a slow performing query with Entity Framework. ToTraceString() method. 1 Entity Framework Slow Query Problem. include Performance Issue; Entity Framework performance of include; Answer. Big Batch of Entity Framework Apr 2, 2013 · Found it. Extremely slow and inefficient query execution from Entity Framework. Jul 26, 2019 · Entity framework very slow to load for first time after every compilation. It's true that it translates into an IN clause in SQL and that the SQL query itself is executed fast. May 15, 2015 · Entity Framework query too slow. May 10, 2011 · Entity Framework and slow bulk INSERTs. Share Improve this answer Mar 24, 2019 · The first Entity Framework Query is always slow because EF compiles your model and generates mapping views in memory. Obviously, eager loading an entire table with a rather large number of records is not going to be the fastest query, but overall it's not necessary for it to be particularly fast. Entity framework and NHibernate are object-relational mapping frameworks. However, now it takes over 60 seconds to run the same stored procedure using entity framework. Not the query itself, just the creation of the context. Sep 16, 2021 · Querying records loaded into memory is far faster than throwing a query at the DB for each record I get from the vendor's API. You can pre-generate those mapping views using the EF Power Tools. I'm starting at a Customer model and I need to also retrieve data that is related one-to-one with the customer, but more importantly, one-to-many with the customer and to make matters even worse there are further one-to-many of the already one-to-many! Jan 30, 2019 · Entity Framework Slow AddRange Insert to DB. Entity Framework is just too slow dealing with records retrieved from complex joins. So the the total number or records to be inserted is ~5000. 4. On a very large model, view generation take some time, as well. There are some tips and tricks that we should keep in mind while desiging and query database using entity framework ORM. 4. Oct 30, 2019 · SaveChanges is the place where Entity Framework actually compiles your LINQ query into a suitable SQL query and executes it to the Database. Modified 9 years, 10 months ago. Good programmers write Jul 27, 2012 · Find calls DetectChanges internally, SingleOrDefault (or generally any query) doesn't. You can use the CompiledQuery type to pre-compile Entity Framework queries in order to do this work ahead of time, before the end user has to wait for it. SPLIT the LINQ query in multiple queries; USE EF+ Query IncludeOptimized (Recommended) SPLIT the LINQ query into multiple queries Jan 19, 2017 · The major problem is that Entity Framework makes a database round-trip for every entity you need to insert. Sep 21, 2015 · Seems like VisualStudio is slow at parsing that huge XML file (my development machine only has 8gb RAM). NET Framework 4. . 6. It has always ran fine and takes around 4 seconds. Jul 6, 2022 · In most cases, the Entity Framework core performance can be speeded up dramatically using caching of query results. AddDbContext<DbContext>(options => options. Apr 20, 2017 · We did some investigation and put some timers in place and we narrowed it down to creating an instance of our Entity Framework 6 DbContext. Bulk Insert Optimization in . EntityContext. 0) 0 Trying to improve Entity Framework performance when querying children of related collections, and their children Oct 4, 2012 · To retrieve the original values of the entity, the DbEntityEntry is retrieved from the context by the call to this. Viewed 6k times Sep 26, 2023 · Compiled models can improve EF Core startup time for applications with large models. Entity Framework offers great advantages over other ORM, and it's in fact pretty fast. Inserting many rows with Entity Framework is extremely slow. So, if you INSERT 50,000 entities, 50,000 database round-trips are performed which is INSANE. 3. EntityFrameworkCore 6. UseSqlServer(serviceConfiguration. He explores these areas and compares perfomance: Default EF (57 minutes to complete adding 30,000 records) Replacing with ADO. net core 3. Performance Woes with Entity Why Entity Framework DetectChanges is slow? More entities your context own, slower the DetectChanges method become! Entity Framework does a great job detect all changes for us, but in exchange, we pay the high-performance cost! Scenario: Entity Framework is generating the following query (as found in SQL Server Profiler) and it's taking nearly 30 seconds to run, when running the same code (again taken from profiler) takes 1 second in SSMS (this is one example but the entire site runs extremely slow when getting data from the database). Where(x => x. The blocking part is actually SqlClient for Async calls and the recommended workaround by @AndriySvyryd that works on the EF core project is: Apr 5, 2024 · LINQ to Entity is a great ORM for querying and managing database. It offers a lot of things, so it is mandatory to know about performance of it. Entity Framework : joining dbcontext Oct 8, 2010 · Regarding the Entity Framework, the first time you run a query it must be compiled into SQL. Oct 14, 2018 · in an earlier version of EF, to speed up your application startup time following workarrounds are applied: Using a Cached DbModelStore, Generate pre-compiled Views, and/or Generate pre-compiled version of entity framework using NGen to avoid jitting. The transaction takes about two to three minutes which is very slow. Why does EF5 produce these spikes in SaveChanges() times? 47. In order to load those views you need to create a custom DbConfiguration class like this: Nov 27, 2023 · Some developers complain that the Entity Framework is horribly slow. We have all migrations in a separate project, and when building either this project or the entire solution, VS tends to take a very long time and MSBuild takes an ungodly amount of resources. Depending on your configuration (POCO, Self-Tracking entities) there is a lot room for optimizations. You may want to retrieve the query EF created for deletion for manual examination and or have a look at the possible query optimizations using a tool like MS SQL SQL Server Management Studio (SSMS) Feb 15, 2016 · entity framework update foreign key throws exception if AutoDetectChangesEnabled set false. May 6, 2017 · EF Core is your problem. I've since put some logging to see on average how long it actually takes to create an instance of our DbContext and it seems it was around 50ms. You should start by profiling the SQL commands actually issued by the Entity Framework. Entity Framework Code First 30+ seconds StartUp Time. Data. Theres a documentation for that here in learn. 13. How to fix slow EF Core 7 Jan 11, 2016 · No Entity Framework provider found for the ADO. Aug 16. However, I dont see any valid way of applying these on Entity Framework Core. Aug 17, 2012 · Performance Considerations (Entity Framework) really helped and the steps for mitigating the impact of generating views brought down a 45-60 second initial load to 3-4 seconds. SqlClient' 690 SqlException from Entity Framework - New transaction is not allowed because there are other threads running in the session Oct 31, 2014 · When it comes to deletion it even gets worse: When saving at the end of all entity removals, DbContext is around 18 times slower than ObjectContext. Feb 26, 2023 · Why Entity Framework async operation takes too much time as compared to a non-async operation? StackOverflow Related Questions. A large model typically means hundreds to thousands of entity types and relationships. It still takes 4 seconds if I run the sp from SQL Management Studio. We eventually switched to notracking for everything in our project. Mar 17, 2015 · this is exactly the problem. 6. No joke, about 15 minutes to refresh. Apr 10, 2012 · Trying to refactor some code that has gotten really slow recently and I came across a code block that is taking 5+ seconds to execute. 8 In my ConfigureService I have: services. 22. 2. Entity Framework Query is too slow. Make sure that the Entity Framework definition for the entity correlates exactly with the table definition, ensure that the Entity's properties are in the same order in the Entity Model as the columns in the SQL Server table. Problem. Entity Framework query too slow. com I am using Entity Framework Core for my first ‘big’ project but a senior developer told me that EF really slows down your application and specially when the size of database increases it just performs really poorly. David Cubero. I was able to reproduce the results of the original answer using the, currently, newest version of EF (6. 5, and can offer a big performance benefit to those who haven’t upgraded from . This call is slowing the process down. NET and EF are very very slow. isActive == true) select sp If I run this proce Jul 14, 2017 · Entity Framework already implements the repository pattern; that is what a DbSet is. Entity Oct 3, 2018 · Hey, this is the accepted answer, but doesn't appear to work for me. The only way to workaround it and limit the whole thing to 2 SQL queries is to filter as much as you can, then load the whole entity set with sub entities in memory using eager loading, then switch to LINQ to Objects and do the final projection/filtering: Feb 25, 2023 · When trying to decide between using the Entity Framework and NHibernate as an ORM, what are the advantages and disadvantages of Entity Framework and NHibernate? Answer. This guide will help you speed up common Entity Framework performance pitfalls. GetSale(bID, SID,m,y). What I am finding is that EF sends one query initially to get the list of parent objects, and then iterates through each parent object and queries the DB for the Nov 13, 2011 · Using Contains in Entity Framework is actually very slow. 0 but want the latest Entity Framework bits in their application. prdnx ehe ssfpkph xhxq jwcmi wpsv muhpry nec ofb kcfr
Entity framework slow. GetSale(bID, SID,m,y).
