RE: SPOOL Problem

From: <Graeme.Farmer_at_mincom.com>
Date: Wed, 7 Jun 2006 13:12:25 +1000
Message-ID: <OF3FC812E7.4A9B7EB6-ON4A257186.00119B53-4A257186.00119C9B@mincom.com>

I would expect that it is an SQL*Plus bug as this is the program that is responsible for accepting the data from the RDBMS and outputting it to file. (The fact that the realloc system call is unhandled would indicate to me that the memory allocation routine is not being tested which is certainly a bug).

Typically a program would read the incoming data (from the RDBMS) into a buffer and then writing from that buffer to the output destination (eg terminal/disk file).

If memory is continuously being allocated to increase the size of the buffer but it is not being released then this leads to a memory leak.

Of course, there could be another reason for your problem so best to raise a TAR and have the guys that write the software give you the definitive answer. To be honest, I’ve never tried creating a spool file that large and it may be that the developers of SQL*Plus didn’t anticipate users would have this requirement either!

What are you actually trying to achieve, there may be an alternative solution?

Cheers

Graeme Farmer

From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org] On Behalf Of "Yongping Yao" <yaoyongping@gmail.com>
Sent: Wednesday, 7 June 2006 1:02 PM
To: "Graeme.Farmer
Cc: oracle-l@freelists.org
Subject: Re: SPOOL Problem

Thank you for your reply. You mean it's a Oracle Bug or maybe a SQL*Plus bug?

On 6/7/06, Graeme.Farmer@mincom.com <Graeme.Farmer@mincom.com> wrote:

Looks like a memory leak bug. Can't imagine the SQL*Plus would intentionally need to allocate memory for the entire output stream.

The reason for the variability in your results probably relates to the amount of memory available on the heap at the time.

Cheers

Graeme Farmer

Consulting Architect

MMS Architecture & Solutions Design

From: oracle-l-bounce@freelists.org [mailto: oracle-l-bounce@freelists.org] On Behalf Of "Yongping Yao" <yaoyongping@gmail.com>
Sent: Wednesday, 7 June 2006 12:13 PM
To: oracle-l@freelists.org
Subject: SPOOL Problem

Hi all,
I don't know if it's off topic, but I met it in SQLPlus.
I SPOOLed the output into a text. When the file reached to GB, an exception "xrealloc: cannot reallocate 706258176 bytes (0 bytes allocated)" occurred. I tried again and again. Everytime the exception occurred with different file size. Sometime it was about 3G, sometime it's near 1G ( and of cource the number in the error is different everytime ).

-bash-2.05b$ uname -a
Linux zszj2 2.4.21-27.EL #1 Wed Dec 1 22:08:15 EST 2004 i686 i686 i386 GNU/Linux

That's my OS. I also tried on Solaris 8, just the same. So I think it's not a 32bitOS or 64bitOS problem. The database is 9.2.0.1.
Have anyone met and solved it?
Thank you in advance.

--
Yao Yongping
Learning Oracle, UNIX/Linux...
Love Reading, Classical Music, Philosophy, Economics etc.
Blog: http://spaces.msn.com/members/yaoyp/

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--
Yao Yongping
Learning Oracle, UNIX/Linux...
Love Reading, Classical Music, Philosophy, Economics etc.
Blog: http://spaces.msn.com/members/yaoyp/

-- http://www.freelists.org/webpage/oracle-l Received on Tue Jun 06 2006 - 22:12:25 CDT