Oracle-L: UTL_RAW and slowness

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Thu, 23 Oct 2003 13:54:33 -0800
Message-ID: <F001.005D421C.20031023135433@fatcity.com>

Hi all,

I am experimenting with a block of pl/sql code (wrote myself) that uses utl_raw to perform xor operation. (Note to Jared and Mladan, I can't use Perl on production boxes, so don't even go there).

I take a message, encrypt 1 character send it out on a wire using utl_tcp. After every 128 bytes, I flush the tcp connection. While this works fine and within our acceptable range for smallish messages (up to 20-25K in size), it nearly kills itself when working with larger messages (80k+).

Initially I could encrypt 128 characters (including conversion from/to utl_raw) in about 50ms. Bt this increase progressively. When I reach about 98000 to 99000 range, it takes about 16 seconds to encrypt 128 characters.

I have logged tar with Oracle, but does anyone know if one could do a block encryption (can't use standard algorithms, this is custom) like encrypt 128 characters at a time instead of 1 ...

The skeleton code looks like this ...

msglen := LENGTH (msg_text);
nCharsSent := 0;
p('Encrypting data...');
FOR i IN 1 .. msglen
LOOP
  ntcpchar := ASCII (SUBSTR (msg_text, i, 1));   r_chr := utl_raw.cast_to_raw(CHR(ntcpchar));   nenctcpchar := TO_NUMBER(utl_raw.bit_xor(r_chr,r_key),'xxxx');   tcpmsglen := UTL_TCP.write_text (gv_tcp_conn, CHR(nenctcpchar), NULL);   nCharsSent := nCharssent + 1;
  IF MOD(ncharssent,128) = 0 THEN
    p('Before Flush ...');
    UTL_TCP.FLUSH (gv_tcp_conn);
    p('Connection Flushed at ' || ncharssent);   END IF;
  --
END LOOP; -- FOR i IN 1 .. msglen

where p is a procedure that dumps supplied text to a trace file with a timestamp that is up to 1 ms resolution. BTW this is a 9202 box. Also when it starts getting slow, using "nmon" I can see that this process is hogging a CUP at 99-100%. Of course this is a dev box, but my SA will not like this on a production box.

Any ideas?
Thanks in advance
Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

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Author: Jamadagni, Rajendra
INET: Rajendra.Jamadagni_at_espn.com

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