dBeaver (CE): DB2 LUW Connection with SQL ERROR 42704. Table Schema won't open but able to write SQL queries

Question

After about a year and half, I am finally able to connect to the DB2 database we have through dBeaver. The connection is successful as a LUW (Our db2 is z/os). I was able to get the drivers required after installing IBM Data Studio.

Once I am connected, I go down the schema, get to Tables, and on clicking that, I get the below error.

SQL Error [42704]: SYSCAT.SCHEMATA IS AN UNDEFINED NAME. SQLCODE=-204, SQLSTATE=42704, DRIVER=3.69.56
SYSCAT.SCHEMATA IS AN UNDEFINED NAME. SQLCODE=-204, SQLSTATE=42704, DRIVER=3.69.56
THE DESCRIBE STATEMENT DOES NOT SPECIFY A PREPARED STATEMENT. SQLCODE=-516, SQLSTATE=26501, DRIVER=3.69.56
THE CURSOR SQL_CURLH200C1 IS NOT IN A PREPARED STATE. SQLCODE=-514, SQLSTATE=26501, DRIVER=3.69.56
SQL Error [42704]: SYSCAT.SCHEMATA IS AN UNDEFINED NAME. SQLCODE=-204, SQLSTATE=42704, DRIVER=3.69.56

However, if ignore the error and go to New SQL query and write a simple

Select * from schema.table

it works fine and get the results I want.

Considering the time i have spent to get till here, this is sufficient, but to deploy as a solution in my department, I need to be able to look at a Table List (schema).

Any help would be awesome.

EDIT1: What the issue is here, is that there is no SCHEMA with the name SYSCAT and no table named SCHEMATA.

Answer 1

The z/OS Db2 catalog has different names than the ones used on Db2 on distributed (Linux Unix Windows aka LUW). Here is a list of objects on Db2 z/OS that you can review.

It looks like you are using dBeaver to navigate through a UI the objects on Db2 for z/OS. You will need to ensure you have a db2 jcc driver that is for z/OS Db2. It looks like you may be using one from LUW as the SYSCAT.SCHEMATA is an LUW object, not az/OS object.

Your other query works because you are specifying a known table name. Other queries should be fine. The issue is the interface in dbeaver is looking at Db2 system objects for LUW and not z/OS. This will continue until you are able to resolve the driver issue.

Answer 2

The IBM Data Server Drivers also require server sided set-up. Please see this information https://www.ibm.com/support/knowledgecenter/SSEPEK_12.0.0/java/src/tpc/imjcc_jccenablespsandtables.html

Answer 3

In DBeaver, when you create a connection choose the "DB2 z/OS driver" option under the Db2 drop down, when connecting to DB2 for z/OS

BTW DBeaver can shell share with Data Studio, so you can (if you wish) use both products in one install. No guarantees that they share happily in all cases, but it appears to work reasonably well.