RE: Where is CLOB data physically stored?

Here's the deal. I've got disk being burnt quick and it seems as though it may be due to converting a 32K character column to a CLOB(1M).

I think that I've found the reason...

In determining the length of the CLOB column at write time, it was calculated using:

CLOB_Len = %len(%trim(clob));

But this seems to only trim the x'40' characters off the end of the string. Somehow , the clob variable was padded with x'00'...so the %trim() didn't work...it returned the whole length...1M.

To repair it, I used SQL trim to whack the trailing x'00' characters, calc'ed the length of this much shorter string, and got the correct answer:

reset Clob;
CLOB = %trim(parm_in);
exec sql set :length = length(trim(trailing x'00' from :parm_in));
CLOB_Len = length;

Thanks all!

Steve Needles


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of John Yeung
Sent: Tuesday, March 03, 2015 11:32 AM
To: Midrange Systems Technical Discussion
Subject: Re: Where is CLOB data physically stored?

On Tue, Mar 3, 2015 at 11:39 AM, Needles,Stephen J <SNEEDLES@xxxxxxxxxxxxxxxx> wrote:

I'm trying to understand a few of things and so far, my research hasn't satisfied me. We are trying to get our heads around our disk usage and have a couple of questions we've been unable to find answers for.

While your questions are valid, it might be helpful to also share the reason you're asking these questions in the first place. Are you running out of disk space? Using a lot more disk space than you expected? Wondering how to design a new table? Is there something in particular which prompted you to focus on CLOBs?

John Y.
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