Cross Database Access not supported

[Bio_ftr]

I am connecting to a netzezza database using ODBC. I have worked on this tiny bit of code for a few days and I keep getting an error:
DBD::ODBC::st execute failed: ERROR: Cross Database Access not supported for this type of command (SQL-HY000) at line 20.

Line 20 is $sth-> execute(). I am not crossing databases so I don't understand what is causing this error. I can replace the update statement with a select, and the program runs correctly.

This is the code:

use strict;
use warnings;
use DBI;
use DBD::ODBC;

DBI->trace(0);
my $dbh = DBI-> connect('dbi:ODBC:system', 'user', 'pwd') or die "Couldn't connect to database: " . DBI->errstr;

my $stmt= "update db_name.user.table_name set column_name= 8 where column_name2 like 'someValue'";
#my $stmt= "select column_name1, column_name2 from db_name.user.table_name where column_name2 like 'anotherValue'";

my $sth;
$sth = $dbh->prepare($stmt) or die "Couldn't prepare statement:". $dbh->errstr;
$sth-> execute() #Execute the query or die "Couldn't execute statement:".$dbh->errstr;
$sth->finish();
$dbh->disconnect;
use DBI;

[erix]

It seems netezza cross-database access is readonly: it won't work in insert, update, or delete statements.

At least that is what I conclude from this IBM doc page which says:

"You cannot use a cross-database INSERT, UPDATE, or DELETE statements to change a table in a different, remote, database. If you attempt a cross-database write operation, the system displays an error message.

For example:

DEV.DBUSER(DBUSER)=>INSERT INTO prod..emp SELECT * FROM newusers;
Cross Database Access not supported for this type of command."

So I think you just have to remove the 'dbname.' part from the statement so that netezza won't think it is asked to do (illegal) cross database access.

update: (Having no Netezza here, I tried to recreate the error on Postgres (on which Netezza was based albeit a long time ago [1]). Postgres doesn't have cross-database access at all, not even readonly. Postgres still shows a similar error message when asked to access another database:

(Pg 9.5devel, HEAD dcbf5948e12a)

$ psql -d testdb
psql (9.5devel)
Type "help" for help.

testdb=# create table t(c text);
CREATE TABLE

testdb=# insert into t values ('value 1');
INSERT 0 1

testdb=# insert into test.public.t values ('value 3');
ERROR:  cross-database references are not implemented: "test.public.t"
LINE 1: insert into test.public.t values ('value 2');

[1] https://wiki.postgresql.org/wiki/PostgreSQL_derived_databases

)

[Anonymous Monk]

I am not crossing databases so I don't understand what is causing this error.

Its a message from your ODBC driver (not perl module)

So i'd try to be more specific like you are here   db_name.user.table_name and use "full" names like that for all the names in your statement

Then I'd check the permissions your user has, these links talk about this permissions issue http://colbran.co.za/wordpress/netezza/netezza-schemas-and-cross-database-access/, http://netezza-tutorials.blogspot.com/2011/03/accessing-other-databases.html

Then the drastic options is looking for a different ODBC driver ... or even worse, different database system