Databases :: Very Slow Performance With Sql?

Nov 22, 2010

I'm using MySql with 2.0. Every page witch has a database operation take long time to complete. How can i increase the performance.

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Performance - Application Slow But CPU Is At 40% Max?

Nov 19, 2010

I have a strange situation on a production server. Connection for 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 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 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:

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:

CPU utilization 9%
Worker Thread: Total: 111 Running: 111 Idle: 0 MaxLimit: 200 MinLimit: 100
Work Request in Queue: 1589

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Performance - Application Running Slow?

Feb 22, 2011

There'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?

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Performance - Slow First Page Load On Site?

Jan 20, 2010

Every now and then (always after a long period of idle-time, e.g. overnight) when I access a site built using - it takes around 15 seconds to load the page (15 seconds before I see any progress whatsoever, then the page comes up fast).Further pages on that site, or refreshes, are quick as usual - they are also fast on other machines, only the first one seems to take the 'hit'.

Page tracing never through anything up (whole cycle was a fraction of a second) So my question is where else should I be looking? Perhaps IIS? Or could it still be my app and I'm just looking in the wrong place (the trace) for clues?As I don't have much control over the IIS server, anything I can check through would be more helpful, before I go ask that particular admin.

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Performance - Webforms W/ AJAX Slow Rendering?

Mar 1, 2010

I have a Webforms, AJAX-enabled web page which, when rendering large amounts of data, is extremely slow to load in IE (we're married to IE - no other browser options). In an attempt to determine the source of the slowness, I viewed the HTML source (about 2.5 MB) and copied all of it (except for the Ajax JavaScript calls) to a blank .html file. IE renders this file MUCH faster than when the rendering happens through .Net. This seems to indicate that the AJAX JavaScript is slowing down the display of the page. Does this sound plausible? Any recommendations on improving performance here?

I've already eliminated as many UpdatePanel controls as I can from the page, but it doesn't seem to help with render time.Update... In the HTML source, I noticed that at the bottom of the screen, a call to WebForm_InitCallback() appears. When I executed this call directly through javascript:alert(WebForm_InitCallback());, the CPU spikes for 12 seconds before it completes! This call is here because I implemented ICallbackEventHandler to try to accomplish some traditional-style AJAX handling. Looking at WebResource.axd, that WebForm_InitCallback() method iterates through the entire form and attaches some kind of events to EVERY SINGLE textbox, checkbox, radiobutton, etc. So I guess I really need to abandon ScriptManager and UpdatePanel altogether here.

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Improving Performance / User Is Complaining That It Is Too Slow?

Feb 16, 2011

I have developed a gridview which has 7,000 records with some filtering. However, theuser is compaining that it is too slow. It seems to me that if the records were stored in memory it would be much faster. This is caching, I think. Is that the case? Can you updaterecords this way? Can you cache with an Access database or do you have to use SQL Server? Can you think of any other ways to improve

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AJAX :: Calling Resource Files Many Times - Slow Performance

Mar 2, 2010

Whenever I use ASP.NET AJAX it's calling Resource.asx files many times and it's affecting site performance. How can we avoid that?

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Web Forms :: Performance Slow / Being Load Most Speedy Then Pages Developed?

Jan 19, 2010

I often Observed that pages developed in simple asp is being load most speedy then pages developed in ,

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Forms Data Controls :: Binding Gridview - The Performance Of The Page Is Very Slow

Jan 20, 2011

I am using gridview. In which i m entering some value in textbox in Gridview.According to that value, i m generating datatable and binding it to the Gridview(Child Gridview).But when i m doing this, the performance of the page is very slow. How do i improve the performance.

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Configuration :: Slow Performance With Offshore Hosting - Does Distance Between Servers And DBs Matter

Sep 7, 2010

I just had to moved a site of mine from a hosting service here in the states to an offshore host located in Malaysia. My database is still located on the east coast of north america and I am wondering if the distance between the database and the file system might be to blame for slow load times or if moving my database as well would be a waste of time.

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Databases :: Add / Retrieve Is Slow In Oracle?

Jul 15, 2010

In my web page I have written code that writes to a table in Oracle 9i. What I find is add ing or querying the table in Oracle is very slow. I tried doing the same with SQL server database and the process if 5 times faster than Oracle. In the Oracle or SQL table I have not created any indexes / primary keys, but still I find the SQL is way faster than Oracle.

Is there any way that I could improve the speed in Oracle? My table has 3 columns (PRVal, FACVal and UserID). And when the user is selected from the web page I retreive the values from the database, using a direct sql (no pl/sql stuff here, as I am new to Oracle). I use OleDBConnection, OleDbCommand and OleDbReaders classes to access Oracle data.

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Databases :: C# Vs. PL/SQL Performance Difference?

Feb 17, 2011

I am working on an ASP.NET project that has significant backend processing existing in PLSQL. I was wondering if I re-write this code properly in C# can I get similar performance results or is the PL/SQL code going to beat my C# code every time?

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Databases :: Retrieving Records From Oracle Is Slow?

Sep 29, 2010

I have created a table in my Oracle database and am trying to add / edit / delete/ query the records. This table already has 4000000 records. Now when I try to query the database, it takes close to 3 minuetes to return records. I have tried creating indexes, but was not successfull so far.

Following is the structure:

User : varchar(20)
Fac : varchar(10)
Prm: varchar(100)

I am using the following code in VS2005:


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Databases :: Oracle.DataAccess.Client Very Slow - How To Make It Fast

Oct 29, 2010

When I run my piece of SQL through SQL developer it takes less than half a second with an overall cost of 618 on the explain plan.

When I run the same SQL through .NET via the oracle.dataaccess.client connection it is impossibly slow taking over 5 minutes to run.

What could be causing this and what can I do?

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Configuration :: .Net Website Performance Of 2 Sites - Rectify The DB Performance While Insertion?

Sep 20, 2010

I have developed a website in 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?

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DataSource Controls :: LINQ Performance Application Performance Is Not Up To Par?

Apr 29, 2010

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.

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WCF / ASMX :: Wcf Performance Vs Page Events Performance?

Mar 20, 2011

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 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.

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Databases :: Data Access Layer For Multiple Databases?

Jul 6, 2010

i want to develop a data access layer ,it can support multiple database like oracle ,Mssqlserver and Mysql using enterprise library and 3.5 based on database connection

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C# - Switch Between Databases / Use Two Databases Simultaneously?

Dec 28, 2010

I have a web site which uses one SQL database but the hosting company is very slow sometimes and I got database timeout, login and similar errors. Can I implement my code to use two databases simultaneously? I have stored procedures and the data is updated periodically.


Simply: When dbDefault is down and inaccessible I need to use dbSecondary so the web app keeps running. Ant these two databases must be always same.


Some errors:

A transport-level error has occurred when sending the request to the server. (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host.)A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.Cannot open database "db" requested by the login. The login failed. Login failed for user 'root'.

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Debug Application - Relatively Slow

Apr 23, 2010

why is it that when i debug my application in chrome it is relatively slow between postbacks compared to internet explorer? when i use internet explorer, its lightning fast.

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Website Response Is Too Slow?

Jun 11, 2010

I have a problem with the performance of the web site-application . The major problem is when i hit the site from a long distance remote pc all server side events responces are too slow espesially the gridview (paging) , the point is when i used ajax update panel of it was more slower .

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C# - Very Slow Web Application Which Use LINQ To SQL?

Jul 17, 2010

I am developing sample web application which use C#, and LINQ to SQL. The application is very very slow and it takes about 2 secs to navigate between pages. I have already used SQL Profiler and monitor the calls to the SQL server. All SQLs looks normal to me and their execution time is always about 1 or 2 millisecs.I tried the same application in another PC and it is the same. So, it is not because of my computer performance.

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Every Second Postback On Chrome Is Slow?

Mar 23, 2011

i've recognized that on google chrome browser every second postback of my application is a bit slow (~1 seconds)... every other shows up immediately. internet explorer is doing fine on every postback!

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ADO.NET :: LINQ To SQL Very Slow Website?

Oct 9, 2010

I have created a website with 3.5 and c# (using linq to sql). its a basically a project managment system. bt its very slow when u look at its loading time. my dashboard takes a whole lot of time to load.when i look at other sites created by my colleagues it loads much faster than my site. they have developed it using + Stored procedures. that made me believe that linq to sql is slower than + SP improve my site perfomance using linq to sql.

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Page Loading Process Very Slow

Jun 3, 2010

i hit a case when my page loading is very very slow. I have find out that my page is slow for no reason. The read data process from database is fast and all the server code execute quite fast. The problem is the page loading process is slow, very slow. I am thinking one of the possible cause is jquery itself.

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