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IDS 11.10 - 30 Sep 2012
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IDS Forum

Re: informix upgrade to V10

Posted By: Keith Simmons
Date: Monday, 15 January 2007, at 4:16 a.m.

In Response To: RE: informix upgrade to V10 (Marcus Haarmann)

On 13/01/07, Marcus Haarmann <marcus.haarmann@midoco.de> wrote:
>
> 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.
<SNIPPED>

If both instances are on the same network you could try making them
visible to each other (TCP/IP connection, entries in hosts and
sqlhosts and .rhosts files). This would enable you so run ' INSERT
INTO local:db.table SELECT * FROM remote:db.table '. If the tables are
rather large (individually) then use a named pipe on the new machine
and run 2 seesions:
1. ' UNLOAD TO named_pipe SELECT * FROM remote:db.table '
2. DBLOAD from anmed pipe into target table.

Use dbschema to generate your tables and amend to place where you
require with sensible init and next.

I used this mechanism to transfer 300Gb in Nov 2005 with no issues.

Keith

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