Htp.p buffer too small?

Hi,
We are downloading an ascii file (delimitered for export to Exel) in the browser, generated with the pl/sql web toolkit. In a DB procedure we set the correct mime-type and stream the data with htp.p to the browser. In the browser the download file window appears and you are able to save the file on the file system. When retrieving about 100 rows all is fine, but when trying to retrieve around 2000 rows the server times out and the file does NOT download. My guess is that the htp.p buffer somehow overflows. Please advise on any solutions.
Thanks, Tony

<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by Tony de Bok ([email protected]):
Hi,
We are downloading an ascii file (delimitered for export to Exel) in the browser, generated with the pl/sql web toolkit. In a DB procedure we set the correct mime-type and stream the data with htp.p to the browser. In the browser the download file window appears and you are able to save the file on the file system. When retrieving about 100 rows all is fine, but when trying to retrieve around 2000 rows the server times out and the file does NOT download. My guess is that the htp.p buffer somehow overflows. Please advise on any solutions.
Thanks, Tony <HR></BLOCKQUOTE>
Hi Tony
Could you get an answer to this problem?
I am also facing the same problem. Could you please advise me on the solution please.
Rgds
Enoch
Email:
[email protected]
null

Similar Messages

Character string buffer too small (select list query based LOV)

Hi,
Using the select list query based LOV with a select witch is too big, you get this error.
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When using the Popup LOV query based LOV) then it works nice.
Can that be solved somehow?
With the Popup LOV the return value is displayed in stead of the description.

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How do I incorporate your suggestion on a report ?
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I am running into a very strange problem with the APEX listener on seemingly random pages. I can hit every page in my application just fine, but as soon as I hit this specific one, Glassfish throws an HTTP 500 error. If I click Debug, the page seems to load fine with no indications of trouble, but as soon as I turn debug back off, it goes back to the HTTP 500 error. I don't see anything special about the page that makes this happen. It is pretty simple and has 4 regions. I have noticed that if I set any 1 of the 4 regions to "Never display", the page loads fine. It's like having all 4 of them enabled at once are causing some overload, even though it's actually a smaller amount of data than most of my other pages.
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Both applications and pages in question worked without issue in APEX 3.x. I am trying to get an APEX application up and running on the latest version.
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APEX version: 4.0.2
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[#|2011-05-10T21:14:22.967-0500|INFO|oracle-glassfish3.1|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=111;_ThreadName=Thread-1;|MaxConnectionReuseCount=50000|#]
[#|2011-05-10T21:14:46.431-0500|SEVERE|oracle-glassfish3.1|javax.enterprise.system.std.com.sun.enterprise.server.logging|_ThreadID=112;_ThreadName=Thread-1;|
***********ERROR***********
init: # headers=46
declare nm owa.vc_arr := ?;
vl owa.vc_arr := ?;
begin
owa.init_cgi_env( ?, nm, vl );
htp.init; htp.HTBUF_LEN := 63;
? := sys_context('USERENV','SID');
end;
SID:1242
CALL:
begin
f(p=>?);
commit;
end;
BINDS
p:100:2:220529248574492::NOPAGE CALL:
declare
nlns number := 999999;
l_clob CLOB;
lines htp.htbuf_arr;
l_buff varchar2(32767);
l_clob_init boolean:= false;
l_file varchar2(5);
l_doc_info varchar2(1000);
begin
OWA.GET_PAGE(lines, nlns);
if (nlns > 1) then
for i in 1..nlns loop
if ( length(lines(i)) > 0 ) then
if ( ( lengthb(l_buff) + lengthb(lines(i))) > 32767) then
if (NOT l_clob_init) then
dbms_lob.createtemporary(l_clob, TRUE);
dbms_lob.open(l_clob, dbms_lob.lob_readwrite);
l_clob_init:=true;
end if;
dbms_lob.writeappend(l_clob,length(l_buff),l_buff);
l_buff := lines(i);
else
l_buff := l_buff || lines(i);
end if;
end if;
end loop;
end if;
if (l_clob_init) then
dbms_lob.writeappend(l_clob,length(l_buff),l_buff);
l_buff := '';
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? := l_clob;
? := l_buff;
if (wpg_docload.is_file_download) then l_file:='TRUE'; wpg_docload.get_download_file(l_doc_info); else l_file := 'FALSE'; end if; ? := l_file;
? := l_doc_info;
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get_page FAILED:ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at line 33
Edited by: BrianB on May 11, 2011 7:50 AM
Edited by: BrianB on May 11, 2011 8:01 AM

Brian,
this post is going to get a bit longer, so the summary comes first.
h6. Summary
1. I could reproduce the problem on my system using the APEX Listener in standalone mode.
2. I don't think the problem is content-related in the sense that you have any issue in your page or database contents.
3. I have a workaround for your problem.
h6. Error message
Having that error in my environment made me start to think. I not only disabled some item and got it work, but I could also add something to achieve this effect.
So I came to think, this really is somewhere deep down. The error message doesn't seem very helpful on first sight, but when starting to follow on what's happening there, things get clearer:
APEX generates pages dynamically, replacing substitution strings and other tokens to get the actual page definition. This has to be read by a requesting client. The use of VARCHAR2 as buffer introduces a limit of 32767 bytes, after which the contents is handled as CLOB instead.
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Obviously, there are cases where the "estimation" fails. Of course, this is may only be relevant in rare cases, because:
1. If a page would exceed the maximum without some charset interpretation problem, the buffer would be switched to clob.
2. If a page stays small enough to stay below 32767 even with some characters that are acutally larger then expected, the buffer isn't busted.
To find out, if your could be one of these rare cases, I investigated the HTTP headers, focussing on X-DB-Content-length and made an odd observation.
Test case 1: "Go" button disabled, so the page runs fine with APEX Listener
1. It has *31968 bytes* when coming from APEX Listener with a Go button disabled.
2. It has *31938 bytes* according to the header set by EPG - for exactly the same page.
That makes a difference of 30 bytes for what is expected to be the same contents.
Test case 2: The button is enabled again
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2. EPG transports *32341 bytes* according to that header.
So we are pretty close to the hard limit for the VARCHAR2 buffer.
For some reason, APEX Listener seems to cause a false calculation of the actual page size. Whether this is due to some charset problem or due to some other problem with response handling, I don't know. The 30 bytes difference may result from the odd header "X-ORACLE-IGNORE" with value "IGNORE, IGNORE, IGNORE, IGNORE" sent by the APEX Listener. This value has exactly 30 bytes in length, but this could be coincidence, as there are more differences in headers. If I add the size of all headers, we are even closer to the buffer limit and probably exceed it when some items need more bytes than expected.
This could even be as simple as a line break, as your page has about 424 lines when I disabled the button... Adding 1 byte per line to the 32341 bytes of the EPG, I get 32765 bytes. Now add that button (403 bytes difference on EPG) and you exceeed the limit. Reduce that value by the line count again and you are still below.
Could be coincidence as well, but makes me wonder.
h6. Workaround
To make sure that we were actually hitting that limit, I now introduce my suggestion for a workaround.
Test case 3: Add a hidden item
1. APEX Listener loads the page, stating the size to be *32876 bytes*
2. EPG sees 30 bytes less and transmits the header with *32846 bytes*
h6. Conclusion
I can't give you a real solution for that problem, nor do I have a definitive answer on what is the root cause for it. It seems, only one of the developers may find it. But I can offer you a workaround, which is to just add some hidden item to your page so it exceeds the limit for the VARCHAR2 buffer and gets handled as clob.
Note that this may occur outside the app builder as well. The app builder just renders some additional items when starting that page, so it has a different size from its productive representation. On the other hand, I may start counting the size of that additional page section - I wouldn't wonder if that results in a value around 400 bytes, and this is the forgotten part...
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-Udo

The ADO NET Source was unable to process the data. ORA-64203: Destination buffer too small to hold CLOB data after character set conversion.

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<code> should be
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Report error:ORA-06502:character string buffer too small. urgent!!

Hi guys,
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report error:
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
In this page, on the left is a tree, the right side is a tabular form, when I click one tree node, it will pass the current node id to the form and the form will display the children data. When I click some tree node, it will raise the ORA-06502 error, but when click some other nodes, it is correct. I don't know why. And on my test environment, it has no this error, the test environment has same version with prod environment, only has less data in database. Could you help me???
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Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
-------------------------------------------------------------------

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Is this the same posting as
ORA-06502 numeric or value error string

Error PL/SQL: numeric or value error: character string buffer too small

HI oracle gurus,
I am new to PL/SQL,
my oracle version is oracle 11g.
i have create a procedure to insert data from flat file to a table using UTL_FILE.
Table is
CREATE TABLE EXT_PERSON_INFO
ID_PERSON              NUMBER(38),
ID_BATCH             NUMBER(38),
ID_PERSON_NBR        VARCHAR2(3 BYTE),
ID_AREA              VARCHAR2(5 BYTE),
NM_FINAL              VARCHAR2(20 BYTE),
NM_START             VARCHAR2(20 BYTE),
DT_DOB             DATE,
ID_SERIAL               VARCHAR2(9 BYTE),
DT_RESPONSE          DATE,
TRANS_TYPE VARCHAR2(2 BYTE),
REG_RESPONSE VARCHAR2(1 BYTE),
TM_RX          TIMESTAMP(6)
my procedure is
CREATE OR REPLACE PROCEDURE PROC_PERSON
IS
f_line VARCHAR2(2000);
f utl_file.file_type;
f_dir VARCHAR2(250);
fname VARCHAR2(50);
F_ID_PERSON EXT_PERSON_INFO.ID_PERSON%type :=1;
F_ID_BATCH EXT_PERSON_INFO.ID_BATCH%type :=1;
F_ID_PERSON_NBR EXT_PERSON_INFO.ID_PERSON_NBR%type;
F_ID_AREA EXT_PERSON_INFO.ID_AREA%type;
F_NM_FINAL EXT_PERSON_INFO.NM_FINAL%type;
F_NM_START EXT_PERSON_INFO.NM_START%type;
F_DT_DOB EXT_PERSON_INFO.DT_DOB%type;
F_ID_SERIAL EXT_PERSON_INFO.ID_SERIAL%type;
F_DT_RESPONSE EXT_PERSON_INFO.DT_RESPONSE%type;
F_TRANS_TYPE EXT_PERSON_INFO.TRANS_TYPE%type;
F_REG_RESPONSE EXT_PERSON_INFO.REG_RESPONSE%type;
BEGIN
fname := 'D:\raj\raj.txt';
f:= utl_file.fopen('RAJ',fname,'r');
loop
begin
utl_file.get_line(f,f_line);
exception
when no_data_found then
exit;
end;
F_ID_PERSON := 1;
F_ID_BATCH := 1;
F_ID_PERSON_NBR :=substr(f_line,1,3);
F_NM_FINAL := substr(f_line,4,22);
F_NM_START := substr(f_line,23,34);
F_DT_DOB := substr(f_line,35,44);
F_ID_SERIAL := substr(f_line,45,48);
F_DT_RESPONSE := substr(f_line,49,58);
F_TRANS_TYPE := substr(f_line,59,60);
F_REG_RESPONSE := substr(f_line,61,61);
F_ID_AREA := substr(f_line,62,64);
insert into EXT_PERSON_INFO VALUES (F_ID_PERSON,F_ID_BATCH,F_ID_PERSON_NBR,F_ID_AREA,F_NM_FINAL,F_NM_START,F_DT_DOB,F_ID_SERIAL,F_DT_RESPONSE,F_TRANS_TYPE,F_REG_RESPONSE);
end loop;
utl_file.fclose(f);
commit;
end;
am getting error
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
please help me in this regard. unable to trace the issue.
Thanks in advance
Regards,
raj

The error message should have included a line number for you to reference back to your code to know what line the error was occurring on.
That said, look at the documentation for SUBSTR as you are using the third parm incorrectly. It is length, not end position. That's your issue.

Error:numeric or value error : buffer too small

hi
can any one please help me?
i am developing the application in HTMLDB. i have an error numeric or value error: char buffer too small.
i have an attributes plan_name,type......att_header1 in the database. The data's were inserted to the database, without the att_header item but if i have the item att_header int the HTMLDB then the insertion is not working. and also i was able to insert the data into the database for the field att_header1 through sql command . i think the problem is onle in my HTMLDB application.
please tell me the solution for this error.
thanx in advance
valli
Message was edited by:
valli

Valli,
I don't think you understood my post, above:
Can you please create an application that shows the problem on apex.oracle.com? Then we'll be able to see all your code together with the database tables, etc.
If you do not have a workspace you can request one.
Please request a workspace on apex.oracle.com. After your workspace request is approved, create an application there that shows this problem you are having. Create the necessary tables, packages, and other database objects in the database to support the example.
As the last step, post here the workspace name, the application ID, and detailed instructions explaining how to use your application to demonstrate the problem.
Scott

Oracle Report Error (string buffer too small) in Portal

Hi,
I have registered an oracle report (.rdf) with portal which works fine outside in Reports Builder, but when I try to run it in Portal it keeps throwing this error:
SQL-6502: ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at "PORTAL.WWV_RW_USR", line 444
ORA-06512: at "PORTAL.WWV_RW_USR", line 923
ORA-06512: at line 1
Anyone know what needs to be done to fix this?
Thanks

Sean:
Thank you very much for wading through my post.
>"if (NIerror = DAQmxCfgInputBuffer(h, numSamples*4))"
>I would leave this line out. DAQmx should create an input buffer automatically
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Yeah- I put that in trying to fix the problem. The error message doesn't say *which* buffer is too small
>If you just call the DAQmxReadDigitalLines() function with "numSampsPerChan" set to -1,
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I'm trying to avoid the wait. That's why I'm trying to figure out how many samples are ready.
I suppose I can try numSampsPerChan=-1, set a short timeout and check for the timeout error.
>If this does not help, please send me a small section of code that reproduces that behavior,
>and I will try running it on my machine.
I will try modifying one of the examples to do what I'm trying to do.
Again, Thank you!
John Weeks
WaveMetrics, Inc.
Phone (503) 620-3001
Fax (503) 620-6754
www.wavemetrics.com

ORA-6502: PL/SQL: numeric or value error: character string buffer too small WWV-11230

Hi,
I'm trying to create an UI Template. I've generated the html using Frontpage and am successfully able to see in a browser.
I've copied the html to the UI form, but when I try to preview or execute the UI template, I get the following error:
Error: ORA-06502: PL/SQL: numeric or value error: character string buffer too small (WWV-11230)
null

I AM FACING SIMILAR PROBLEM, THE EXACT ERROR IS:
Error: Excepcisn de wwv_generate_component.build_procedure (WWV-01821)
No se ha podido generar la pantalla de interfaz de usuario: ORA-06502: PL/SQL: numeric or value error: character string buffer too small (WWV-16409)
(SORRY , PART OF THE ERROR IS IN SPANISH!)
I CREATED A FORM , WORKED WITH IT A LOT WITHOUT PROBLEMS. NOW I NEED TO DO SOME CHANGES ON CERTAIN FIELDS AND WHEN I TRY TO SAVE IT I GET THE ABOVE ERROR.
THEN I GO BACK TO AN OLDER VERSION, COPY AND TRY TO DO CHANGES AND AGAIN THE ERROR COMES UP.
THE CHANGES I AM TRYING TO DO ARE TO SOME OF THE EXISTING FIELDS IN THE FORM WHICH NEED TO BE PUT AS "INSERTABLE".
THE SCREEN LAYOUT IS DISPLAYED WITHOUT PROBLEM.
(THE FORM IS BASED ON A TABLE WITH APROX 80 FIELDS).
I NEED SOME URGENT HELP. PLS LET ME KNOW ANY OTHER INFO YOU MAY NEED TO HELP ME SOLVE THIS PROBLEM.
FYI I AM WORKING ON PORTAL VERSION 3.0.9 / ON Windows 2000 (DATABASE 8.1.7.0 AND iAS ARE ON DIFFERENT MACHINES).
TKS IN ADVANCE

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