I am not sure if this is the right forum. I can not find a forum for LINQ.
I am working on an application using LINQ. Application performance is not up to par and my tests show that it is LINQ queries that are slow. I was wondering if anybody can recommend where I can find an article about optimizing LINQ performance maybe by compilation or other methods.
how to improve the application performance while writing LINQ Queries ?Like the optimization techniques.
View 2 RepliesI have developed a website in asp.net framework 2 . This website is being hosted in two different servers without any change in code. My issue is about the performance of these 2 sites. One website is taking much time for inserting datas to the DB (SQL server 2005). 2 websites are having different DB server.
I think the issue is for the DB server. How can we rectify the DB performance while insertion and Is there any other cause for this permance issue?
I am creating a service oriented application where trying to have everything using services....however there is something I am not sure of , I am having a page that calls the database at the page load...so what would be better and faster?? to call database in pageload , or to call wcf service from javascript during javascript load ??btw , I am using a repeater in the page , but I have created somekind of an engine to create the suitable html so...I'll be creating the repeaters html using the wcf and resend it back to the page If I am using a wcf service at the start.
View 1 RepliesI have got a table in SQL Severs as following, which contains sales data (approx 10m records), the indexes and primary keys are SalesDate, StoreNo and ItemNoSalesDate StoreNo ItemNo SalesQtyWhen I am querying the table for a given item and store's sales for the last 7 days, if I use the query:
[Code]....
The query runs almost instantly, obviously using IN is the faster mehtod here, but I have read elsewhere that using BETWEEN is the quicker method, can anyone confirm?
I have one online school management application developed on asp.net 3.5 using Linq,
Now in my database i have main three talbes which uses in many store procedures,functions,linq join query
CourseMst - Master Table Have CourseID P.K.
StudentMst - Master Table Have StudentID P.K.
Student_Course - Child Table Have StudentCourseID P.K
StudentID F.K. Reference To StudentMSt
CourseID F.K. Reference To CourseMSt
Now i want to increse speed of my application for those page which have query or sp related to above tables,
I want to know about indexing procedure that how to apply indexing and on which field i have to apply indexing
i am calling a scalar function from a stored procedure. Does using user defined scalar finction has a negative impact on performance.
View 1 RepliesI had created a web site with asp.net and sqlserver. How can i improve the my website's performance in with regard sqlserver connection?What's your mind about use pool connection? In this regard what the defualt values is set for 'Max Pool Size' and 'Min Pool Size'?What's your mind about use Asynchronous access to data? What's your mind about other ways that you think?
View 3 Repliesi build online course selection for a university now i want to make it layering and i dont know to make it 2 layer or 3 layer i mean mix business layer and database layer because i use linq so it is not require to check request data that in sql from client in business layer because linq check it autimatically to preent injection and etc.is it right?can i put my class and DB class in same place or layer?if i make it 2 layer the performance becom better?
View 5 RepliesI have a select query where iam fetching the data from minimum of 7 different tables by using innerjoin. I have 3 lakhs of records in that table.BY using cache Iam fetching all 3lakhs of records at a time and put in cache. by using the rowfilter i use the records.firsttime when iam fetching these 3lakhs records it takes 3min. want to improve the performance of time.How to improve the performance of time?
View 1 RepliesI have created the stored procedure in SQL server 2005. i have used nested cusrsors in this SP. also many records are there. So, its performance is too low.
i forced to use cursor, because the this is calcualtion process. i have to fetch the records one by one, do the calculation and insert the result to the another relevent tables.
So it cause big performance issue.this is my sample scanario.
First i have to take the products from the customerforecast for the certain duration. (i used cursor to fetch the products)
then i need to get the list of machines can run for the each product. (i used cursor to fetch the machines)
then i have to fetch the Unit per hour value for the combination of machine and prduct.then i have to use formula and do the calculation and store the result to the 3 different tables.
I am using Sql server 2005. I have a stored procedure, which has a select statement to retrieve thousands of data from the table.
The time taken to execute is longer and hence affecting the performance.
[Code]....
Here, id is the primary key. Clustered Index is also set.
How to improve the performance of the stored procedure?
I have web application in ASP.NET 2.0 and C#.I have a gridview and i have a checkbox in the gridview. I am trying to save the checked record from the gridview to the database. The time taken to save the data is becoming huge and causing performance issues.
[Code]...
I am tasked to build a web 2.0 style mashup application which consumes a lot of 3rd party webservices like youtube and twitter. There are also lots custom features which are going to be built using ASP.NET 3.5 and SQL Server 2008. Now I am looking for the right ORM for my needs. From a performance and ease of use standpoint can anyone suggest me the right ORM for this kind of web application?
View 1 RepliesI have a dataset that comprises of multiple tables (about 20) linked together with constraints to reflect the relational database. My question(s):
1) Will having multiple tables affect performance? I'm asking this as there are often times I would not need to get data for all the tables, but only for specific tables.
2) If it does affect performance, would breaking up the tables into their own datasets be the best solution. It seems to me that by doing that, you would lose the ability to apply constraints among tables and tables that might exist in multiple datasets will be subjected to replication.
I would like to have everything in one dataset as I get a view of the related tables and their relationships and also because the Fill method allow me to fill tables, maintaining the hierarchy of the data, but performance is still a key factor.
I have a query that I want to test the performance of when the query is included directly in the SqlDataSource versus when I call a stored procedure. Does anyone have suggestions on how I would be able to closely watch the actual steps here? I was thinking of turning on tracing and adding Trace.Write for each of the events that fire along the way. This doesn't seem efficient and I wanted to see if there was a better approach.
View 2 RepliesI have a strange situation on a production server. Connection for asp.net get queued but the CPU is only at 40%. Also the database runs fine at 30% CPU.
Some more history as requested in the comments:
In the peak hours the sites gets around 20,000 visitors an hour.
The site is an asp.net webforms application with a lot of AJAX/POSTs
The site uses a lot of User generated content
We measure the performance of the site with a testpage which does hit the database and the webservices used by the site. This page get served within a second on normal load. Whe define the application as slow when the request takes more than 4 seconds.
From the measurements we can see that the connectiontime is fast, but the processing time is large.
We can't pinpoint the slowresponse the a single request, the site runs fine during normal hours but gets slow during peak hours
We had a problem that the site was CPU bound (aka running at 100%), we fixed that
We also had problems with exceptions maken the appdomain restart, we fixed that do
During peak hours I take a look at the asp.net performance counters. We can see behaviour that we have 600 current connections with 500 queued connections.
At peak times the CPU is around 40% (which makes me the think that it is not CPU bound)
Physical memory is around 60% used
At peak times the DatabaseServer CPU is around 30% (which makes me think it is not Database bound)
My conclusion is that something else is stopping the server from handling the requests faster. Possible suspects:
Deadlocks (!syncblk only gives one lock)
Disk I/O (checked via sysinternals procesexplorer: 3.5 mB/s)
Garbage collection (10~15% during peaks)
Network I/O (connect time still low)
To find out what the proces is doing I created to minidumps.
I managed to create two MemoryDumps 20 seconds apart. This is the output of the first:
!threadpool
CPU utilization 6%
Worker Thread: Total: 95 Running: 72 Idle: 23 MaxLimit: 200 MinLimit: 100
Work Request in Queue: 1
Number of Timers: 64
and the output of the second:
!threadpool
CPU utilization 9%
Worker Thread: Total: 111 Running: 111 Idle: 0 MaxLimit: 200 MinLimit: 100
Work Request in Queue: 1589
Performance testing best practices for an ap .net application
View 1 RepliesWeb forms .NET application, is starting to meet 64 bits Windows servers and we have a 32bit DLL from one of our component vendors (its a hardware key, actually). I checked the instructions here "compiling a .net application with either a 32-bit or 64-bit dll". It is also what our vendor sugested. question: is there a performance impact on compiling a web application to run on x86 mode ?Please don't flame me for using a hardware key
View 1 RepliesWhat is Performance Counter and how to use them in ASP.NET application.
View 2 RepliesI have a ASP.NET web application (.NET 2008) using MS SQL server 2005, I want to increase the performance of the web site, If anyone have an article contains steps to do that, step by step , In SQL(Indexes, ..... etc.) and in the code.
View 4 RepliesI just want some tricks for increase ASP.Net application. This question is a little wide.
View 5 Repliesregarding the performance improvement in Asp.Net?The best practise tips for asp.net performance improvement?
View 4 RepliesLet me know asp.net application performance tips..
View 2 RepliesThere's a web app I've been assigned to, which is running very slow. It is a site that sells products so it is database driven, however even pages that do not query the database are loading very slow. The pages use master pages, and the code is in VB.NETI checked with fiddler and the time it takes to load basic (non database driven) pages are about 5.5 seconds on average.
What are some tools that can help me determine the cause of the slow speeds, and any recommendations as to how to speed it up, or potential issues that could cause it?UpdateSo I messed around with the code piece by piece as I wasn't getting anywhere with these tools. As soon as I remove master pages, and I include the same code that's on the master pages in the .aspx page itself, the speed improves drastically (approximately 5 times faster load times).What might cause the master pages to cause load times to slow down so much?