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Status Future consideration
Workspace IBM i
Categories Db2 for i
Created by Guest
Created on Jan 7, 2025

RELATED IDEAS

Split DBOpen exit point in new format

See this idea on ideas.ibm.com

DBOpen Exit Point takes care of ANY database access, regardless what type. This results in performance problems.

Severals performance tests show that from 100% DBOpen Acess apx. 95%-99% are coming from Native I/Os. This is from exit point technology prospective less important because all this are running in native environment, not connected to any external device.

To avoid performance problems when registering an exit program we request to add beside of existing exit point format QIBM_QDM_OPEN DBOP0100 a new Format DBOP0200 that skips on operating system level all native I/Os (NTVIO) and call the exit point only for all others (OPNQRYF, Query/API, Other Non-SQL, Interactive SQL, ODBC, Other SQL, QSQPRCED API (SAP) and SQL CLI).

For clients that are interested only in ODBC transactions, optional another Format DBOP0300 may call the exit point only in case of ODBC connections (Job names QSQSRVR, QZDASOINIT, QZDASSINIT,...)

This ideas was already discussed with Scott Forstie but not yet decided.

Idea priority High
  • Guest
    Reply
    |     Jan 28, 2025
    IBM will use this Idea as input to planning, but no commitment is made or implied. This Idea will be updated in the future if IBM implements it.

    Db2 for i development team
    IBM Power Systems Development
  • Guest
    Reply
    |     Jan 21, 2025
    DBOpen Exit Point takes care of ANY database access, regardless what type. This results in performance problems.

    Not quite true - the exit point program is called ONLY on FULL open of a database table, not for ANY database access. So the program is not called after the job has opened the table.

    The exit point offers user handling of table opens - allowing additional checks besides object security and rejecting the open under some circumstances.

    The exit point program is called from ANY interface. If you do not want native opens, check for this as your frst step in your exit program and return immediately. The performance penalty for this would be absolute minor.

    If you have 95%-99% native table opens, you should have a look at the number of full opens performed in your application, e.g. using the SQL Performance Center, which shows this on the first page. Opening a table is a heavy operation and should be reduced as much as possible.


    Best regards,

    Christian

    CEAC member and IBM Champion

    1 reply

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