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Status Under review
Workspace Db2 for z/OS
Created by Guest
Created on Jun 10, 2024

Remove some of the restrictions related to SQLCODE -20555

There is currently a restriction on the use of archive-enabled tables and temporal tables in one statement:

The execution of this statement leads to SQLCODE -20555:

SELECT * FROM DB2.LZTB0586     
WHERE VNR IN (                 
SELECT VNR                     
FROM DB2.LZTB0520)            


SQLERROR ON   SELECT    COMMAND, DESCRIBE  FUNCTION                             
RESULT OF SQL STATEMENT:                                                       
DSNT408I SQLCODE = -20555, ERROR:  AN ARCHIVE-ENABLED TABLE IS NOT ALLOWED IN THE SPECIFIED CONTEXT. REASON CODE  1     
                             
Reason Code 1 means:                                                      
                                                      
The SQL statement cannot reference both an             
archive-enabled table and a temporal table.                                                           
(The temporal table can be either a systemperiod       
temporal table or an application-period                
temporal table.) For example, a query, a view          
definition, or an INSERT, UPDATE, or DELETE            
statement cannot reference both of these table         
types.      


In this case:      

LZTB0520 is defined with PERIOD SYSTEM_TIME and has a versioning table DB2.LZTH0520:
ALTER TABLE DB2.LZTB0520 ADD VERSIONING USE HISTORY TABLE DB2.LZTH0520;                    

LZTB0586 has an archive-table DB2.LZTR0586:
ALTER TABLE DB2.LZTB0586 ENABLE ARCHIVE USE DB2.LZTR0586    

But: 

The value of SYSIBMADM.GET_ARCHIVE is N.
The clause FOR SYSTEM TIME is not used.
                                      
Therefore, only the base tables are  accessed in this case.

In this simple case, the restriction is not necessary and the statement should be executed.
         

Needed By Month