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IDS Forum

Re: Require Info about Create Table

Posted By: Art S. Kagel (Oninit)
Date: Thursday, 10 April 2008, at 9:30 a.m.

In Response To: Require Info about Create Table (VIKAS HIVARKAR)

VIKAS HIVARKAR wrote:
> Hello,
>
> I have 2 databases( db1 & db2 )in same instance.
>
> db1 has a table "archive" with 10000 rows, i want to create a table in db2 as
> a exact replica of table "archive" from db1 with all the 10000 rows.
>
> What syntax should i use ?
>

First, note that you can create a synonym in the second database that
will connect the table in db1 to db2 directly.

Now, assuming that you still want a copy and not access to the original
table, use the dbschema utility to get the tables DDL:

dbschema -d db1 -t archive -ss >db1_archive.sql
You may want to edit the file to change the tables location if it was
specifically placed in a particular dbspace and not in the db1
database's home dbspace. Otherwise just run that script while attached
to db2 and voila! you'll have an exact duplicate of the table's
structure in db2. Now for the data, you have many options:

* Copy the data using pure SQL:

o INSERT INTO db2:archive SELECT * FROM db1:archive;

* Export the data to disk and reimport it into db2:

o DATABASE db1;

o UNLOAD TO 'archive.unl' SELECT * FROM archive;

o DATABASE db2;

o LOAD FROM 'archive.unl' INSERT INTO ARCHIVE;

Both of these methods have a few problems. First, they will require a
very large number of locks (10000 * (1 + #indexes)) unless you lock the
table before loading. Second, if you do not have enough logical log
space to hold the entire transaction and all other update activity on
the server during the duration of the transaction, you will get a long
transaction error and the whole thing will roll back. Third, if db1 and
db2 have different logging statuses (ie one is logged and the other is
not) you will not be able to use the direct copy option as you cannot
run distributed queries between databases with differing logging
statuses. There are two solutions:

* Instead of using the dbaccess LOAD FROM verb to reload the

extracted data, you can use the dbload utilility which will make

partial commits every <N> rows eliminating both problems. See the

Migration Guide Informix manual for details on setting up a dbload

command file. It's not hard.

* Get my dbcopy utility which will copy the data directly from one

table to the other with partial commits. Dbcopy uses separate

connections to the two databases (you must use a non-shared memory

connection for at least one of those connections - dbcopy -? for

details) so it avoids the third problem also. Dbcopy tends to be

faster than a distributed SQL copy. Dbcopy is included in the

package utils2_ak which you can download from the IIUG Software

Repository or from the Oninit web site.

Art S. Kagel
Oninit

> Pls guide !
>
> Thanking you all,
>
> vikas.
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
> See you at the IIUG Informix 2008 Conference
> The Power Conference for Informix Professionals
> April 27 - 30, 2008 Marriott Overland Park (Kansas City), Kansas
> http://www.iiug.org/conf
> Registration Now Open!!
>
>
>

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