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IDS Forum

Re: Blob Questions

Posted By: Marcus Haarmann
Date: Wednesday, 22 October 2014, at 4:32 p.m.

In Response To: Blob Questions (DAN MUELLER)


if you have columns of type "text", these can be put into a blobspace, but HDR will not work !
And yes, by putting them in a blobspace will not count for the max pages limit.
Just putting columns in another dbspace has no effect on the application.

Better solution: modify the columns to be of type CLOB and put them in a smart Blobspace.
A smart Blobspace can be logged and should work with HDR.
Java Code changes are not required, if I recall correctly the API (setString/getString methods should work).
We have done things like that with Oracle and Informix in the past.

But I am not sure about the conversion of text column content to clob. Maybe you will have to write a program
to do the conversion, I never did that (byte to blob can be done with a cast (::blob), but not vice-versa)
What we did:
table a (
col1 byte
alter table a add (col1_blob blob);
(either provide a storage clause or define a default sdbspace)

update a set col1_blob = col1::blob ....

The general strategy should be to add a new column to the existing table for each of the text colums,
perform the updates (copy the old text content to the new columns) and then rename the columns and drop the old ones.
That way, you can do the trick without interrupting the application.

Hope this helps.

Marcus Haarmann

----- Ursprüngliche Mail -----

Gesendet: Mittwoch, 22. Oktober 2014 22:17:59
Betreff: Blob Questions [34018]

Hello Folks,

IDS 11.70.FC5GE

I have some blob questions. I have a table with 4 text columns that keeps
running out of pages in the tablespace. Since fragmentation in Growth Edition
is not an option, I want to move the blobs from the tablespace to a blobspace.
I have 3 questions around that:

1. Will the blobs replicate in HDR if they reside in a blobspace?
2. Are there any java coding requirements to make this work in the
3. Do the blob pages count against the tablespace page limit?


Forum Note: Use "Reply" to post a response in the discussion forum.

Messages In This Thread

  • Blob Questions
    DAN MUELLER -- Wednesday, 22 October 2014, at 4:17 p.m.
    • Re: Blob Questions
      Fernando Nunes -- Wednesday, 22 October 2014, at 4:30 p.m.
    • Re: Blob Questions
      Marcus Haarmann -- Wednesday, 22 October 2014, at 4:32 p.m.
    • Re: Blob Questions
      JACQUES RENAUT -- Wednesday, 22 October 2014, at 4:33 p.m.
    • Re: Blob Questions
      Art Kagel -- Wednesday, 22 October 2014, at 7:00 p.m.

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