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Re: Onunload and onload

Posted By: Marcus Haarmann
Date: Wednesday, 5 June 2013, at 4:29 p.m.

In Response To: Re: Onunload and onload (Art Kagel)

Hi,,

if you have snapshot capability for your devices, there is an easy option to shortly block the DB (onmode -c block), take a snapshot,
unblock the DB again (onmode -c unblock).
We do this for nightly exports to have a clean basepoint. Taking a snapshot using lvm2 does not take more than
some seconds. We are using Linux, not sure about HPUX.

We then set some symbolic links to the snapshot devices in a chroot environment and start a second instance,
which is then working on the snapshot devices. Separate onconfig with own tcp listener, much less buffer space
to not overload the machine.
Then, you can dbexport/onunload without any problem, having a consistent environment as base,
including the ability to lock the databases in exclusive mode. After doing that, simply shut down the separate instance
and drop the snapshot.
We are also using this mechanism to make a level 1 backup of our big documents database (800 GB), which ist build
on smartblobs. This is necessary to prevent too long locks during backup. The smartblobs are being searched
for modified pages for Level 1 backup, which takes about an hour. During this time, the original instance
would be blocked. Level 0 has to be done on the original instance and Level 2 is not possible in this setup.

Marcus Haarmann

----- Ursprüngliche Mail -----

Von: "Art Kagel" <art.kagel@gmail.com>
An: ids@iiug.org
Gesendet: Mittwoch, 5. Juni 2013 22:14:50
Betreff: Re: Onunload and onload [30438]

Let me know how it goes.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on my employer, Advanced DataTools, the IIUG, nor any
other organization with which I am associated either explicitly,
implicitly, or by inference. Neither do those opinions reflect those of
other individuals affiliated with any entity with which I am affiliated nor
those of the entities themselves.

On Wed, Jun 5, 2013 at 3:53 PM, ANDREW PISTOCCHI <APISTOCCHI@ut.edu> wrote:

> Thanks for the input everyone. I will try the ontape to disk tonight to see
> how long it takes. This looks like the best option going from one machine
> to
> another and will be great to test all our databases on our R&D server.
>
> Art....I would definitely like to try the myexport and myimport utilities
> for
> copying databases on our production server. On our production blade HPUX
> Integrity server we have 3 databases; Live, train and dev all in separate
> dbspaces. The dev database is exclusively for the developers and
> programmers.
> Our users have the ability to test in the train database. We have an
> increasing need for the train and dev databases to be updated frequently
> from
> live. Twice a year, I would use our scheduled downtime to copy live to
> train
> and dev using onunload / onload.
>
> Now, developers and users want the train and dev databases on our
> production
> server refreshed from live a few times a year and possibly every month.
> Each
> database is about 33 GB. Our university runs Jenzabar CX on Informix. Our
> databases are larger than most Jenzabar CX schools but probably small from
> Informix standards. It sounds like the myexport / myimport utilities would
> work great for this process.
>
> Andy P.
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art
> Kagel
> Sent: Wednesday, June 05, 2013 2:18 PM
> To: ids@iiug.org
> Subject: Re: Onunload and onload [30435]
>
> If the disks for dbspaces are the same, then if you want to copy the entire
> server instance, using ontape to disk is easiest. If you just need to copy
> a
> single database, then yes, you can use dbexport/dbimport just note that
> dbexport will require an exclusive lock on the source database so no other
> users can be connected to the database while dbexport is running. If you
> need
> to make an export while the server is being accessed, you can download my
> package, myexport, which contains compatible replacements for dbexport and
> dbimport (myexport and myimport respectively). Myexport does not lock the
> database, however, in order to avoid constraint violations problems at
> import
> time, you should use the myexport -p option to export all tables
> concurrently
> in parallel.
>
> Myexport/myimport also requires my dbschema replacement utility myschema
> which
> is in the package utils2_ak. Myexport/myimport can use any or three
> different
> methods for moving the data out of and back into the database.
> In order of increasing speed these are:
>
> 1. Use Jonathan Leffler's sqlcmd (default, -U option). To use this
>
> method you will also need the latest sqlcmd package.
>
> 2. Use the HPLoader (-D, -C, -S options). This requires Ravi Krishna's
>
> myonpload package.
>
> 3. Use external tables (-E option). This does not require any other
>
> packages.
>
> With exceptions discussed in the README.1st file, the exported files and
> schema myexport creates can be reloaded with dbimport and dbexport files
> can
> be imported using myimport.
>
> Another alternative would be to create an empty database on the target
> machine, and use my dbcopy utility (in the utils2_ak package) to copy the
> data
> directly from one server to the other. Dbcopy is very fast between servers
> and
> if you can separate ranges of rows by key ranges you can run multiple
> copies
> of dbcopy to move larger tables VERY quickly (dbschema -hd <table> is the
> easiest way to determine a good set of key ranges). You can use the
> mkdbcopy.awk script in my utils4_ak package to postprocess dbschema (or
> myschema) output into a shell script that will copy every table using
> dbcopy
> (you may have to reorder some of the tables in the resulting script to
> avoid
> constraint violations if the constraints and indexes are already in place
> at
> the time you copy the data).
>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and
> do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
> organization with which I am associated either explicitly, implicitly, or
> by
> inference. Neither do those opinions reflect those of other individuals
> affiliated with any entity with which I am affiliated nor those of the
> entities themselves.
>
> On Wed, Jun 5, 2013 at 1:35 PM, ANDREW PISTOCCHI <APISTOCCHI@ut.edu>
> wrote:
>
> > I have an older HP Integrity server that I would like to use for R&D
> > testing for our Informix databases. I need assistance in copying a
> > database from one server to another. Both servers are Integrity
> > servers running HPUX 11i v3 and Informix 11.70.FC4. On the production
> > server, I've used the onunload and onload utilities to copy a live
> > database to a train or dev database. This works fine. Now I would like
> > to copy a database from one server to the other without using any tape
> > devices. Both servers are on the same network. Both servers have the
> > same size dbspaces. The R&D server was restored from a HP Ignite
> > make_tape_recovery bootable tape so all the file systems, logical
> > volumes and dbspaces are the same on both servers.
> >
> > I've also seen older posts on using dbexport / dbimport and other
> > utilities.
> > What would be the best utility to do this on a regular basis? Thanks.
> >
> > Andy Pistocchi
> > DBA / Systems Administrator
> > The University of Tampa
> > apistocchi@ut.edu<mailto:apistocchi@ut.edu>
> >
> >
> >
> >
>
>
>
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