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IDS Forum

Re: informix upgrade to V10

Posted By: Kern Doe
Date: Friday, 12 January 2007, at 2:14 p.m.

In Response To: RE: informix upgrade to V10 (Clifton Bean)

Not to unload/load and to either filesystem or tape, as far as my experiment went.

----- Original Message ----
From: Clifton Bean <cbean@ctm.com>
To: ids@iiug.org
Sent: Friday, January 12, 2007 1:39:23 PM
Subject: RE: informix upgrade to V10 [8198]

I understand that dbexport and dbimport with v5 and v7 have problems with a
2-GB limit.

Does unload and load have the same limitation?

Take care.
Clifton

-----Original Message-----
From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Kern
Doe
Sent: Friday, January 12, 2007 12:19 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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