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IDS Forum

RE: informix upgrade to V10

Posted By: Marcus Haarmann
Date: Saturday, 13 January 2007, at 5:13 a.m.

In Response To: RE: informix upgrade to V10 (Everett Mills)

Denny,

This should be the easiest way, in order to go around tape problems.
A dbexport to an NFS mount should be no problem, you can also import from
the same external volume.
In this case you do not even need a tape.
If you have a table > 2GB (as export file !), you should use unload to ...
in 2-3 steps and then concat the data.
Truncate the table to one row and do the rest by dbexport. In the export
script, you can see the filename and replace it by the unloaded one.

Marcus

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Everett Mills
Sent: Friday, January 12, 2007 8:13 PM
To: ids@iiug.org
Subject: RE: informix upgrade to V10 [8201]

Denny-

Assuming the you're running a Unix variant, have you considered loading
Linux on a PC with a 50GB + hard drive in it? You could then NFS mount the
PC's drive and dbexport to it. As long as none of your tables is bigger than
2GB unloaded, you should be in good shape... You could then tar (or whatever
your favorite Unix backup util is) the mounted directory to your tape.

--EEM

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Guo,
Denny
Sent: Friday, January 12, 2007 12:40 PM
To: ids@iiug.org
Subject: RE: informix upgrade to V10 [8199]

Thanks Kern.
I will think about it.

Have nice weekend.

Denny

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Kern
Doe
Sent: Friday, January 12, 2007 1:19 PM
To: ids@iiug.org
Subject: Re: informix upgrade to V10 [8197]

Based on what you want to do (no tape changing) and with IDS version 7
you're running with, dbexport won't serve you well -- again because of the
dbexport's 2G limitation. This is what you can try and I've done it before,
for
example:

1) using "unload" statement to unload tables to a tape, specify "no rewind"
--> n
for example,
unload to /dev/rmt/tl0n select * from customer; unload to /dev/rmt/tl0n
select * from order; unload to /dev/rmt/tl0n select * from state; unload to
/dev/rmt/tl0n select * from inventory; unload to /dev/rmt/tl0n select * from
address;

2) the reload is tricky, you will to rewind the whole tape, then start with
the last table, still with "no rewind":
for example,
load from /dev/rmt/tl0n insert into address; load from /dev/rmt/tl0n insert
into inventory; load from /dev/rmt/tl0n insert into state; load from
/dev/rmt/tl0n insert into order; load from /dev/rmt/tl0n insert into
customer;

This will help you to overcome the 2GB limitation, say, your customer table
is greater than 2GB, it won't matter any more.

3) the last tricky part is, and it depends on the logical design of your

database -- in some cases, you must load one table before another -- so you
must understand your database structure, that's the whole new subject
besides this dbexport issue.

Good luck.

----- Original Message ----
From: "Guo, Denny" <DGuo@livingstonintl.com>
To: ids@iiug.org
Sent: Friday, January 12, 2007 12:07:43 PM
Subject: RE: informix upgrade to V10 [8188]

Yes. I think The limitation is 2GB.
Say for a 50G database, do you need 25 tapes? How to solve such problem?

I am trying to not change the tape (100G capability), the dbexport can write
to the same tape.
The question is will it write from beginning? Will old data been erased?

Thanks,
Denny

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Kern
Doe
Sent: Friday, January 12, 2007 11:52 AM
To: ids@iiug.org
Subject: Re: informix upgrade to V10 [8187]

I thought the limitation for IDS 7 is at 2GB for dbexport (2,097,151
kilobytes.) -- you can't specify size 100000000 (yes/no?)

----- Original Message ----
From: "ART KAGEL, BLOOMBERG/ 731 LEXIN" <kagel@bloomberg.net>
To: ids@iiug.org
Sent: Friday, January 12, 2007 11:39:15 AM
Subject: RE: informix upgrade to V10 [8186]

Remove the commas from the -s argument. It should be:

dbexport -c -ss -b 1024 -s 100000000 -f db.sql ip_0p

Art S. Kagel
----- Original Message -----
From: Denny Guo <ids@iiug.org>
At: 1/12 11:41:58

Hi All,

I am doing the dbexport now. But have some issues.
The current version of informxi we are running is V7.31.

The tape we are using have 100G capability.
Issue command " dbexport -c -ss -b 1024 -s 100,000,000 -f db.sql ip_0p"
would work. It complains about the block size must less than or equal to

tape side.
I have to change to tape size to "1,000,000,000". However it stops at some
point ask to mount another tape? The databse we try to export only 50G.

According to the manual, there are some restrictions for version 7. See
below statement.
"-s tapesize Specifies, in kilobytes, the amount of data that you canstore
on the tape. ** Restrictions: The tape size is limited to
2,097,151 kilobytes. The limit is required because of the way dbexport and
dbimport track their positions into the tape."

Any ideas?

Thanks,
Denny

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