The below SQL query is running extremely slow. Im using this query on other tables and its processing about 5 rows per second. The below version is running 1 row every 10 seconds when @SQLNew is executed.
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One of my peer wrote a query based on multiple tables using joins. One of the table is in a different database The query was taking much time
1. Create an SP
2. Create a temp table and copy all records from the external db
3. Avoid using Left Join as much as possible and use Inner Join
4. Create and use indexes
5. Remove tables/columns that are not necessary
In this scenario, I would like to suggest to use Covering Index, but how can it be created for multiple tables and a temp table?
I am trying to display this query result in an aspx page.
It is very slow in loading. Here is the query. The inner query inside the outer quesry is the problem.(Please see the underlined part in the query) - (If I remove that part it is very fast.)
select
top 500
--This column is the issue
,Governing_Class=( case when exists (select top 1 tqc.class_code from
t_quote_class tqc
inner join t_quote_class_premium tqcm on tqc.class_code =tqcm.
class_code
where tqc.appid=pi.appid and tqc.class_code not in('8742' ,'8810','7380')
order by tqcm.premium_amt desc
)
then ( select top 1 tqc.class_code from
t_quote_class tqc
inner join t_quote_class_premium tqcm on tqc.class_code =tqcm.
class_code
where tqc.appid=pi.
appid
order by tqcm.premium_amt desc
)
......... From tables
I've got this query UPDATE linkeddb...table SET field1 = 'Y' WHERE column1 = '1234' This takes 23 seconds to select and update one row But if I use openquery (which I don't want to) then it only takes half a second.
The reason I don't want to use openquery is so I can add parameters to my query securely and be safe from SQL injections. Does anyone know of any reason for it to be running so slowly?
In my database when I fire query it takes 40 secs on 1 crore data, similar when I use join with other table then it take more time. I have taken care non cluster index such thing. But still I want to optimize my query, what other thing I need to take like buffer, disk size etc. I am not sure on this area.
View 11 RepliesI am running a sql script which Inserts 500 rows and after each insert, it calls a stored procedure which diplays result in the results window. So after executing 100 rows, it throws an error that maximum number od results in the results pane has reached its limit but the query executes successfully. How can we disable the stored proc output to not display in the results pane. I do not have access to the stored procedure.
View 4 RepliesI'm more into the LAMP stack, but I've been asked to work on a site that is running Windows and IIS 2008. I'm a beginner with IIS, so please be patient with me on this, and please ask me to provide more information if that is needed to determine. I read the answer here (Slow first page load on asp.net site), but it seems like if I go to the site with one browser it takes long to load the first page, then fast on all other pages, then if I open up another browser, it's the same thing, so it's not something that is saved on the server, but per session? Is there a way to have the application running at all times? Right now it is taking 12 to 15 seconds for the first page to load. I have access to the WebControlCenter and FTP.
View 3 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?
My web app connects to my database server which is on my lan. It is usually very quick but once in a while the connection is extremely slow and has even causing errors by timing out. The server only has 1 gb of memory so I'm going to upgrade to at least 4 gb.
View 3 RepliesI am using AUtomapper which I am very impressed with however, I have a complex object with many nested collections. I'm using Telerik OpenAccess and it returns the 1400 records fast but when I pass it to Automapper and it slows to a ridiculous crawl. Here is my code for reference:
List<DAL.Event> query = httpContext.Events.Where(e => e.Inactive != true && e.Event_Locations != null).ToList();
Mapper.CreateMap<DAL.Event, EventDTO>();
Mapper.CreateMap<DAL.Event_Association, EventAssociationDTO>(); [code]....
Page A loads very fast; Page B loads very slowly and does some CPU-intensive things on the web server. I noticed that if someone is loading Page B, then Page A also loads slowly - for ALL users. What is the standard practice for making sure this doesn't happen? If multiple users are loading Page B at the same time then Page A is ridiculously slow. Is there an IIS setting, web.config setting, or hardware configuration I could use to make sure that the fast-loading pages aren't bogged down by other pages that need more time to load?
View 1 RepliesI'm new in using C# in ASP.net My code is causing Internet Explorer to run slow and return error message asking to stop running this script.
When I use the "Select *...", it return about 700 rows of records and it cause the error.
When I use another SQL "Select NOC0854....", filtering some records, it return about 300 rows of records and no error message appear.
How I can improve my code so that I can retrieve all records from my table? I think 700 rows of records doesn't seem a lot, maybe my code is not correct?
Code:
//cmd.CommandText = "Select * from PTH3759";
cmd.CommandText = "SELECT NOC0854 from PTH3759 WHERE HID0019 >= TO_DATE('11/01/2014','MM/DD/YYYY') AND HID0019 <= TO_DATE('11/28/2014','MM/DD/YYYY')";
cmd.CommandType = CommandType.Text;
OracleDataReader dr = cmd.ExecuteReader();
if (dr.HasRows) {
GridView1.DataSource = cmd.ExecuteReader();
GridView1.DataBind();
}
I have a web service that runs a query (from C#) to get a dataset from sql server. I get the following time out error. Googling on this error says, you can set the timeout on command object. But I am not using command object to set the timeout. This is the code I am using to get the dataset.
code:
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im using an access database with less than 50.000 records on a single table, no relations.
ive put the following code inside a two for cycles as per the respective variables (i, j) the connection is opened outside the outer cycle and closed after it, im holding the connection open to save up on open/close time and im using OleDB thinking it would be faster than ODBC. The ds fill operation takes nearly 3 seconds in debug mode, the total process will require almost 4 hours. How is it possible to speed it up?
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I have 2 tables with Primery Key in both table and 700k in each tables and i am direct executing following Query in SQL Server 2008
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Its speed very slow and then timedout error. My system configuration is good and i am not executing it online but offline on my laptop.
Having real trouble using my local host to test sites. It runs extremely slow! Sometimes up to a minute to load a page. I'm using firefox and the sites i'm testing run fine on other developers in my office local machines/ on the production server.
I've gone through the normal things :-
Disabled IPv6
Not running in debug mood Put the site in the highest app pool (High Isolated) on IIS 6.Taking of firewalls etc.The problem only seems to occur when hitting pages which contain some form of .net code in the code-behind.
Appreciate that this a little bit of a vague topic / stab in the dark but would appreciate any sort of advice - it's horrible waiting a minute each refresh to try out a change!
i have a upload control that alllows users to upload files to the server. and a drop down list that shows the contents of the files in the folder.
And a button labeled execute.
The .txt i need them to upload will give insert queries that the server needs to run upon clicking the execute button.
What should i research in order to accomplish this task?
I am using MS-SQL & VB.Net
I have a SQL table that stores startdate and enddate. I want to run a query on that table every 10 minutes in order to check if the enddate is greater than today and if it is I would like to add a 1 to another column if it is not I would like to add a 0.
I've been having an issue with running an SQL select statement with a button. At the moment, my page has two buttons and allows both to run the gridview where my SQL data displays. In my asp page I have:
<asp:Button ID="btnGo1" Text="Search" runat="server" onClick="btnGo1_Click" />
In the C# code, I have methods for OnLoad and btnGo1_Click, but I'm pretty new to programming and don't know how to link the methods to the button I created.
When doing a query e.g. "select ID from myTable order By SomeStringField" from SQL Developer my data the data are sorted correctly according to database settings:
Abc
abc
Bcd
bcd
But when using the System.Data.OracleClient namespace and a DbProviderFactory to create a DbCommand and use that to create a DbDataReader, the data is sorted case sensitive:
Abc
Bcd
abc
bcd
Is there some setting on the command which needs to be set? Can you even change the case sensitivity in the .net framwork, overriding the database settings?
I have a datasource (which is a query) that could run more than 30 secs. I want to show to a user an animated icon (I have it already) while the Gridview is waiting to return data.
I studied several tutorials and textbooks but all just "thoerectically" use a timer to simulate, without much application to real example above. How should I code it in the above real scenario ? In which event handler to put the code and what control (Update panel) to use and any sample code ?
I want to start a new thread to query a database while my web application continues running. I was under the impression that by using threads I can run the querying process independently while the normal web application page cycle carries on, but I could be wrong.
public class DbAsyncQuery
{
Dictionary<string, object> serviceResults = new Dictionary<string, object>();
public void UpdateBillingDB()
{
QueryAllServices();
foreach (KeyValuePair<string, object> p in serviceResults)
{
IEnumerable results = (IEnumerable)p.Value;
IEnumerable<object> sessions = results.Cast<object>();
DbUtil.MakeBillingDBEntry(sessions, p.Key);
}
}
public static string[] servicesToQuery = new string[] // Must go in config file ultimately
{
"xxx.x.xxx.xx"
};
public delegate void Worker();
private Thread worker;
public void InitializeThread(Worker wrk)
{
worker = new Thread(new ThreadStart(wrk));
worker.Start();
}
public void InitializeQuery()
{
Worker worker = QueryAllServices;
InitializeThread(worker);
}
private void QueryAllServices()
{
Dictionary<string, DateTime> lastEntries = DbUtil.GetLastEntries();
foreach (string ip in servicesToQuery)
{
string fullServicePath =
"http://" + ip + ":800/MyWebService.asmx";
//object[] lastEntry = new object[] { lastEntries[ip] };
object[] lastEntry = new object[] { new DateTime(2011, 1, 1, 0, 0, 0) };
object obj = WebServiceHandler.CallWebService
(fullServicePath, "MyWebService", "GetBillingDBEntries", lastEntry);
serviceResults.Add(ip, obj);
}
}
}
It seems to basically stall and wait to finish the query before loading the page (which can be thousands of rows, so it takes awhile). I put this in the following section of Global.asax:
protected void Application_Start(object sender, EventArgs e)
{
DbAsyncQuery query = new DbAsyncQuery();
query.UpdateBillingDB();
}
This is one of my first web pages, and I'm new to threading. I understand there is a difference between creating your own thread and using the ThreadPool. In this method, I am using my own thread, I think. Not sure if that's the best way. The querying process can be completely independent, and its only going to occur on scheduled intervals (every 8 hours or so). The user doesn't need to have up to the minute data, so it can take awhile. I just don't want the site to wait for it to finish, if that's possible.
I have one query which is not responding even after 4 minutes. But same query is when called from asp.net pages (though stored procedure), responds within 10 seconds. My Query:
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I don't want to know the ways to optimize the query as I have already changed the query and now it responds within fraction of second. I just want to know that, why it was not reponding after 4 minutes in SQL Management Studio and responds in just 10 seconds when run from asp.net through stored procedure. I am using SQL 2008 Express with Advanced services and .NET 3.5.
I have a query which is returning records like below which returns a list of tasks with a corresponding task type. there is a task table (wh_task) and a task type table (wh_task_type). What i want to achieve is a count of all the tickets per ticket type. So at the end of the query i will have a total for Administration / Maintenance tasks (1) and a total for Routine Maintenance Tasks (3). ** and all the other types *
There are many different types of task type so I dont want to have to hard code it. Can count all the occurencies of the different ticket types.
Task Name
Task Type
Date Completed
SBS Server C drive running out of space
Administration / Maintenance
16/07/2007 16:03:34
Patching Server(s).
Routine Maintenance
08/01/2009 06:51:56
Patching Server(s).
Routine Maintenance
11/02/2009 10:06:06
Patching Server(s).
Routine Maintenance
04/05/2009 06:53:24
I can also get wh_task_type_id.
Here is my SQL:
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I am trying to print in an ASP.Net website using the code below and the printing is VERY slow. It takes about 5 minutes for the first document but then subsequent docs are printed without delay:
The printer is Xerox 5645. The server OS on which asp.net website is hosted is win 2008 x64.
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