Hello, here is what I am doing.
1) user accesses web page and clicks button to build report
2) web page accesses web service whose data type is DataSet
(public DataSet methodname()... )
3) web service connects to SqlServer, runs BIG report
4) data is returned to web service, web service returns DataSet to web
front-end
5) web front-end prompts user to save Excel file which contains the
DataSet data
While #3 is running, the aspnet_ws.exe process on the web server grows
big, like 200-500 MB.
The problem is the server doesn't seem to release that memory after the
report is done. A few more report runs and the server starts giving
memory errors.
I have seen people saying use GC.Collect() but where would I put that?
Nov 19 '05
15  2248 
The datagrid is to get the excel output. See below. I found this in
the asp.net ng. I call the web service which returns the dataset, then
I pass the dataset into this static method (I made it a static method
so all of my web pages can call it.
public static void ExportExcel(Sys tem.Data.DataSe t ds, int TableIndex,
string FileNameNoExten sion, System.Web.Http Response response) {
response.Clear( );
response.Charse t = "";
response.Conten tType = "applicatio n/vnd.ms-excel";
response.AddHea der("content-disposition", "attachment;fil ename=" +
FileNameNoExten sion + ".xls");
System.IO.Strin gWriter stringWrite = new System.IO.Strin gWriter();
System.Web.UI.H tmlTextWriter htmlWrite = new
System.Web.UI.H tmlTextWriter(s tringWrite);
System.Web.UI.W ebControls.Data Grid dg = new
System.Web.UI.W ebControls.Data Grid();
dg.DataSource = ds.Tables[TableIndex];
dg.DataBind();
dg.RenderContro l(htmlWrite);
response.Write( stringWrite.ToS tring());
response.End();
ds.Dispose();
}
Are you releasing your Excel references with Marshal.Release COMObject,
or just setting them to null? http://support.microsoft.com/default...;EN-US;Q317109
Please note that this is one of the cases where MS actually does
reference manually calling GC.Collect ... although it's sort of a hack
to deal with reference counting problems in the RCW.
Antonio wrote: Hello, here is what I am doing.
1) user accesses web page and clicks button to build report
2) web page accesses web service whose data type is DataSet
(public DataSet methodname()... )
3) web service connects to SqlServer, runs BIG report
4) data is returned to web service, web service returns DataSet to web
front-end
5) web front-end prompts user to save Excel file which contains the
DataSet data
While #3 is running, the aspnet_ws.exe process on the web server grows
big, like 200-500 MB.
The problem is the server doesn't seem to release that memory after the
report is done. A few more report runs and the server starts giving
memory errors.
I have seen people saying use GC.Collect() but where would I put that?
"Antonio" <bl*****@yahoo. com> wrote in message
news:11******** **************@ g47g2000cwa.goo glegroups.com.. . The datagrid is to get the excel output. See below. I found this in
the asp.net ng. I call the web service which returns the dataset, then
I pass the dataset into this static method (I made it a static method
so all of my web pages can call it.
public static void ExportExcel(Sys tem.Data.DataSe t ds, int TableIndex,
string FileNameNoExten sion, System.Web.Http Response response) {
response.Clear( );
response.Charse t = "";
response.Conten tType = "applicatio n/vnd.ms-excel";
response.AddHea der("content-disposition", "attachment;fil ename=" +
FileNameNoExten sion + ".xls");
System.IO.Strin gWriter stringWrite = new System.IO.Strin gWriter();
System.Web.UI.H tmlTextWriter htmlWrite = new
System.Web.UI.H tmlTextWriter(s tringWrite);
System.Web.UI.W ebControls.Data Grid dg = new
System.Web.UI.W ebControls.Data Grid();
dg.DataSource = ds.Tables[TableIndex];
dg.DataBind();
dg.RenderContro l(htmlWrite);
response.Write( stringWrite.ToS tring());
response.End();
ds.Dispose();
}
Ok, if I understand you correctly, you have following logical tiers:
1. browser client
2. a web application (asp.net)
3. a web service
4. a SQL DB
How about the physical tiers, do 2 and 3 run on the same server (not really
a server, if I'm not mistaken you run this on XP)?
Who's producing the Excel output? And what's the relation between this and
the DS generated by the report?
How large is the dataset passed from the WS to the WA, this is important as
if both run in the same process (aspnet_wp.exe) the working set will contain
two instances of the same DS at some point in time.
Willy.
Yes!
The server are Windows Server 2000 SP4. 2 and 3 DO run on the same
server! #2 is producing the excel file. #3 only connects to the
database and returns to #2 the dataset. then the dataset is handed to
the static method that productces the excel file.
I do not know how big the dataset is but I will try to look.
"Antonio" <bl*****@yahoo. com> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. . Yes!
The server are Windows Server 2000 SP4. 2 and 3 DO run on the same
server! #2 is producing the excel file. #3 only connects to the
database and returns to #2 the dataset. then the dataset is handed to
the static method that productces the excel file.
I do not know how big the dataset is but I will try to look.
Does 2 produce the Excel file through Office automation (COM)? If the answer
is yes, then all I can say is change you design and don't run Office
automation on the server from web applications. Office is not designed to be
used in such scenarios, "it doesn't scale" is an often heard issue but it's
not the worse.
Check following KB article as to why it is like this: http://support.microsoft.com/default...b;en-us;257757
Willy.
Yes thank you that is a great answer. This is not using COM or any
office interop though. Please see the code in my earlier post.
Maybe I can try to pass to the static method the dataset by ref as to
not copy it in memory. Does that make a good suggestion?
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1) user accesses web page and clicks button to build report
2) web page accesses web service whose data type is DataSet
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3) web service connects to SqlServer, runs BIG report
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