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IDS Forum

RE: Question on HPL

Posted By: Habichtsberg, Reinhard
Date: Thursday, 18 October 2012, at 3:47 a.m.

In Response To: Re: Question on HPL (Art Kagel)

If the tables resp. the unload files will grow too big you may even
unload and load using external tables and pipes with no need of storage
space:

Solaris 10, Informix 11.70.FC5
Example shell script:
#!/usr/bin/bash
# Target table was created in target database and has same schema as
source table
# Two Informix Server: source_server and target_server, may also work if
source_server and target_server and source_database and target_database
are the same
# FORMAT 'informix' may not work for tables with byte or text columns

# Target table in target database set to type raw due to express mode:
dbaccess target_database@target_server - << EOF
alter table target_table type (raw);
EOF

# Create pipe for loading:
mkfifo /tmp/target_table.lo

# Create pipe for unloading:
mkfifo /tmp/target_table.un

# Create external table in target database:
dbaccess target_database@target_server - << EOF
CREATE EXTERNAL TABLE ext_target_table sameas target_table
USING (DATAFILES ('PIPE:/tmp/target_table.lo'),
FORMAT 'informix',
REJECTFILE 'target_database_target_table.log',
EXPRESS);
EOF

# Create external table in source database:
dbaccess source_database@source_server - << EOF
CREATE EXTERNAL TABLE ext_source_table SAMEAS source_table
USING (DATAFILES ('PIPE:/tmp/source_table.un'),
FORMAT 'informix');
EOF

# Open pipe in background:
cat > /tmp/$tabelle.lo < /tmp/$tabelle.un &

# Insert Import Command in background:
dbaccess target_database@target_Server - <<EOF &
insert into target_table select * from ext_target_table;
EOF

# Sleep 3 seconds
sleep 3

# Insert Export Command:
dbaccess source_database@source_server - <<EOF
insert into ext_source_table select * from source_table;
EOF

echo EXPORT/IMPORT done!
# Sleep 5 seconds
sleep 5

# Clean up
dbaccess source_database@source_server - <<EOF
drop table ext_source_table;
EOF
dbaccess target_database@target_Server - <<EOF
drop table ext_target_table;
EOF

echo "drop PIPE:"
rm /tmp/ target_table.lo
rm /tmp/source_table.un

# Set Target Table to type standard
dbaccess target_database@target_Server - <<EOF
alter table $tabelle type (standard);
EOF

I scipped the error handling in due of clarity.

HTH
Reinhard

> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
Art
> Kagel
> Sent: Thursday, October 18, 2012 2:25 AM
> To: ids@iiug.org
> Subject: Re: Question on HPL [28556]
>
> You can load using external tables also. Say you have a delimited
file, mydata.unl,
> that you want to load into a table named mydata. So you define an
external table
> defined over the file mydata.unl and insert into the normal table
select from the
> external table. So:
>
> create external table mydata_unl sameas mydata using (datafiles(
> "disk:/some/path/mydata.unl"), format "delimited", delimiter "|" );
>
> insert into mydata
> select * from mydata_unl;
>
> 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, Oct 17, 2012 at 6:51 PM, Kern Doe <kern_doe@yahoo.com> wrote:
>
> > This is great! How would you guys load?
> > Would you use dbload or HPL, I know I don't want to use "load from".
> >
> > Any way, thank you John/Art, we'll try this tomorrow.
> > Kern --
> >
> > ________________________________
> > From: John Miller iii <miller3@us.ibm.com>
> > To: ids@iiug.org
> > Sent: Wednesday, October 17, 2012 5:09 PM
> > Subject: Re: Question on HPL [28552]
> >
> > Here is the syntax for unloading the customer table to 2 files.
> >
> > CREATE EXTERNAL TABLE 'informix'.EXTcustomer SAMEAS
> > 'informix'.customer USING (
> > DATAFILES('DISK:/tmp/customer_1.unl','DISK:/tmp/customer_2.unl'),
> > FORMAT 'DELIMITED',
> > DELIMITER '|',
> > RECORDEND '',
> > ESCAPE
> > );
> >
> > INSERT INTO 'informix'.customer
> > SELECT * FROM 'informix'.EXTcustomer;
> >
> > John F. Miller III
> > STSM, Embedability Architect
> > miller3@us.ibm.com
> > 503-578-5645
> > IBM Informix Dynamic Server (IDS)
> >
> > ids-bounces@iiug.org wrote on 10/17/2012 11:54:06 AM:
> >
> > > From: "Art Kagel" <art.kagel@gmail.com>
> > > To: ids@iiug.org,
> > > Date: 10/17/2012 11:55 AM
> > > Subject: Re: Question on HPL [28551] Sent by: ids-bounces@iiug.org
> > >
> > > Note, this is typed off the cuff, so I may have missed a quote or
> > > comma somewhere.
> > >
> > > create external table sometable_ext like sometable using
> > > (datafiles("disk:/some/path/file","disk:/other/path/file"));
> > >
> > > select * from sometable insert into sometable_ext;
> > >
> > > VOILA!
> > >
> > > For import, when you create the external table you can add the
> > > EXPRESS
> > mode
> > > attribute and it will load the data the same way that HPL in
express
> > > mode
> >
> > > does. You can change the data format from DELIMITED, to INFORMIX,
or
> > > FIXED. You can change the delimiter for the default delimited
format
> > > - no
> >
> > > you can't get rid of the trailing delimiter 8-( - etc. You can
write
> > > to a
> >
> > > pipe so the data can be compressed. Check out the description of
> > > CREATE EXTERNAL TABLE in the online or PDF manuals for full
details.
> > >
> > > Art
> > >
> > > Art S. Kagel
> > > Advanced DataTools (http://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, Oct 17, 2012 at 2:44 PM, Kern Doe <kern_doe@yahoo.com>
wrote:
> > >
> > > > This is getting more interesting. Do you have a simple sample
> > > > codes involved unload/load with external tables? I tried HPL
> > > > unload yesterday on 63
> > mil
> > > > rows
> > > > tables, it took 1hr15min and already happy about it, anything
else
> > > > I
> > can
> > > > do to
> > > > improve further the speed and the flexibility, I'm all for it.
> > > > Thanks Art.
> > > >
> > > > ________________________________
> > > > From: Art Kagel <art.kagel@gmail.com>
> > > > To: ids@iiug.org
> > > > Sent: Wednesday, October 17, 2012 1:19 PM
> > > > Subject: Re: Question on HPL [28546]
> > > >
> > > > FYI, if you have 11.50 or later, you can use external tables for
> > > > the
> > unload
> > > > and it is at least as fast as HPL. Then the select to filter the
> > > > data being written into the external table would be trivial.
> > > >
> > > > Art
> > > >
> > > > Art S. Kagel
> > > > Advanced DataTools (http://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, Oct 17, 2012 at 1:32 PM, Kern Doe <kern_doe@yahoo.com>
> wrote:
> > > >
> > > > > Dear HPL experts,
> > > > > I create a simple HPL unload, it works fast, and it basically
> > > > > dumps
> > the
> > > > > entire
> > > > > table. Is there way I can customize HPL unload for selected
> > > > > data, for
> >
> > > > > example,
> > > > > "customer_id < 2000000" ?
> > > > > Thanks in advance.
> > > > > Kern --
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
>
************************************************************************
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> >
> > > > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > > >
> > > > >
> > > >
> > > > --e89a8f923ba0ddf2be04cc454df1
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
>
************************************************************************
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> >
> > > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
> >
> >
>
************************************************************************
*******
> >
> > > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > >
> > > >
> > >
> > > --14dae93404b93508a004cc45cbb6
> > >
> > >
> > >
> >
> >
> >
> >
>
************************************************************************
*******
> >
> > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > >
> >
> >
> >
> >
>
************************************************************************
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> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
> >
> >
>
************************************************************************
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> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --90e6ba614c8042c2e504cc4a69e1
>
>
>
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> Forum Note: Use "Reply" to post a response in the discussion forum.

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