What kind of the error is the U3057 ABEND?

Document ID : KB000123520
Last Modified Date : 22/12/2018
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Introduction:
When the client ran their existing program that accesses their IMS/DB and DB2, the U3075 ABEND was occurred. (It was executed with interpreter execution.)

 
Question:
What kind of the error is the U3057 ABEND? Why does the U3057 ABEND occur?
Environment:
MF, Z/OS, IMS, DB2
Answer:
First of all, the explanation of the U3057 ABEND is shown in the IBM web site.
<https://www.ibm.com/support/knowledgecenter/ja/SSEPH2_13.1.0/com.ibm.ims13.doc.msgs/msgs/3057.htm> Japanese;
<https://www.ibm.com/support/knowledgecenter/en/SSEPH2_13.1.0/com.ibm.ims13.doc.msgs/msgs/3057.htm> English
Basically, it seems that the DB2 connection couldn't be established because the connection was failed..

First, please see the "Mixing IMS and DB2 Access" in the "IMS/DLI Interface Option Guide". (6-2)
If your CA-Easytrieve Plus program accesses an IMS database and DB2 for OS/390 or z/OS databases, you should run your program under the control of DB2-DL/I BATCH Support. Please see the "Mixing IMS and DB2 Access" for more info.
(Old cases said that this abend also occurs when an application program in a batch region makes an SQL call without specifying DB2, either using DDITV02 or SSM=member. )