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Status Not under consideration
Created by Guest
Created on Jan 31, 2017

Reuse of DB2 prepared statements in IMS JBP (and BMP) regions

Java applications running in an IMS JBP (or BMP) region are not able to reuse DB2 prepared statements after doing a checkpoint call by using the Transaction.checkpoint() or the Transaction.checkpoint(SaveArea) method. If you try to reuse them you will get an exception similar to the following one:

com.ibm.db2.jcc.am.SqlException: Ýjcc¨Ý50053¨Ý12311¨Ý4.19.56¨ T2zOS exception: Ýjcc¨ÝT2zos¨T2zosPreparedStatement.readOpenQueryInternal:nativeOpen:8572: DB2 engine SQL error, SQLCODE = -514, SQLSTATE = 26501, error tokens = SQL_CURLH200C1 ERRORCODE=-514, SQLSTATE=26501
.at com.ibm.db2.jcc.am.kd.a(Unknown Source)
.at com.ibm.db2.jcc.am.kd.a(Unknown Source)
.at com.ibm.db2.jcc.t2zos.cb.a(Unknown Source)
.at com.ibm.db2.jcc.t2zos.cb.a(Unknown Source)
.at com.ibm.db2.jcc.t2zos.cb.a(Unknown Source)
.at com.ibm.db2.jcc.t2zos.cb.a(Unknown Source)
.at com.ibm.db2.jcc.t2zos.cb.b(Unknown Source)
.at com.ibm.db2.jcc.t2zos.T2zosStatement.a(Unknown Source)
.at com.ibm.db2.jcc.t2zos.T2zosPreparedStatement.j(Unknown Source)
.at com.ibm.db2.jcc.am.fp.mb(Unknown Source)
.at com.ibm.db2.jcc.am.gp.b(Unknown Source)
.at com.ibm.db2.jcc.am.gp.kc(Unknown Source)
.at com.ibm.db2.jcc.am.gp.executeQuery(Unknown Source)

Java developers who are new to IMS will not understand what is happening.

This behavior forces you to prepare all DB2 statements again after doing a checkpoint call. Because of the potentially large amount of prepared statements in a batch application and because of the also potentially large amount of checkpoint calls when such a batch application processes a large DB2 database this might cost a lot of performance and it will lengthen the runtimes of the batch application which might have negative impacts on the online operation.

Idea priority High
  • Guest
    Reply
    |
    Jan 24, 2019

    Thank you for your interest in keeping IMS a vital and successful product. Software development has continuously evolved during IMS's lifetime, and so has IMS itself. We have kept pace with, adopted, and implemented many industry standard best practices within our organization, including Continuous Delivery, Design Thinking, and Agile.

    At this time, after further review this request for enhancement, we have decided to reject it. The reason we are rejecting RFE ID 100330 is because given our current priorities we cannot in good faith get to this within 18 months from the date that it is being opened. We value the required requirement and we will keep consider if there are more customer interest and priority changed. You are also welcome to resubmit this RFE at a later date and we will reconsider.

    If you have any further question, please contact us.

    Thank you!
    Haley Fung - hfung@us.ibm.com

  • Guest
    Reply
    |
    Feb 14, 2017

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Analytics Platform
    Product family - IMS
    Product - IMS Transaction Manager
    Component - Application Enablement
    Operating system - IBM z/OS
    Source - None

    For recording keeping, the previous attributes were:
    Brand - Servers and Systems Software
    Product family - zBLC family
    Product - zBLC
    Component - zBLC Requirements
    Operating system - IBM z/OS
    Source - zBLC