Massive memory consumption resulting in massive page file

Question

Platform: Windows XP on Dell precision M60. I GByte RAM, Oracle 10g (10.0.2), Oracle Http Server, APEX 3.1.1
Have a page which runs sql query ..
select
AS_SEEN_ON_ACW(:P51_MESSAGE, :P51_text_col, :P52_backgnd_col) AS "TEXT"
from DUAL
The functions in the database are defined as follows:
create or replace function decimal_to_hex (i_decimal in integer)
return varchar2 as
v_result varchar2(12);
v_hex_digit varchar2(1);
v_quotient integer;
v_remainder integer;
begin
if (i_decimal < 10) then
v_result := to_char(i_decimal);
elsif (i_decimal < 16) then
v_result := chr(65+(i_decimal-10)); -- or 55 + idec
else
v_remainder := mod(i_decimal,16);
v_quotient := round((i_decimal - v_remainder) /16);
v_result :=
decimal_to_hex(v_quotient) ||
decimal_to_hex(v_remainder);
end if;
return v_result;
end decimal_to_hex;
CREATE OR REPLACE FUNCTION HTMLCOLORCODE(V_RESULT IN VARCHAR2)
RETURN VARCHAR2 AS
V_LENGTH INTEGER;
R CHAR(2);
G CHAR(2);
B CHAR(3);
RGB VARCHAR2(12);
TEMP VARCHAR2(12);
BEGIN
v_length := LENGTH(V_RESULT);
if v_length < 1 THEN TEMP := '000000'||V_RESULT;
elsif v_length < 2 THEN TEMP := '00000'||V_RESULT;
elsif v_length < 3 THEN TEMP := '0000'||V_RESULT;
elsif v_length < 4 THEN TEMP := '000'||V_RESULT;
elsif v_length < 5 THEN TEMP := '00'||V_RESULT;
elsif v_length < 6 THEN TEMP := '0'||V_RESULT;
else temp := v_result;
end if;
-- right now invert the rgb
R := SUBSTR(TEMP, 5, 2);
G := SUBSTR(TEMP, 3, 2);
B := SUBSTR(TEMP, 1, 2);
RGB := R||G||b;
RETURN RGB;
END;
CREATE OR REPLACE FUNCTION AS_SEEN_ON_ACW(MESSAGE IN VARCHAR2, TEXT_COL NUMBER, BACKGROUND_COL NUMBER)
RETURN VARCHAR2 AS
TEMP VARCHAR2(4000);
WIDTH NUMBER := 640;
HEIGHT NUMBER := 480;
BEGIN
TEMP := '<TABLE border="0" width="'||WIDTH||'" height="'||HEIGHT||'" style="background-color:#'||HTMLCOLORCODE(decimal_to_hex(BACKGROUND_COL))||'" ><td width="100%"><p style="font-family:Arial;font-size:40;color:#'||HTMLCOLORCODE(decimal_to_hex(TEXT_COL))||'">'|| replace(message,'$','<br>') ||'</p></td></table>';
RETURN TEMP;
END;
When the page loads, the oracle.exe process memory goes through the roof.

Answer 1

Hello,
There appears to be no error checking in those three procedures, when you used P52_backgnd_col and that value didn't exist then the 3rd parameter to your AS_SEEN_ON_ACW procedure would be NULL, this in turn is passed to the decimal_to_hex procedure (which again has no error checking and will not handle it correctly).
By the way, you can use the <code></code> (use square brackets) to make your code much more readable, I had to reformat it to see what it was doing.
Hope this helps,
John.
http://jes.blogs.shellprompt.net
http://www.apex-evangelists.com