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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Feb 20, 2017

RELATED IDEAS

DB2 and WLM MAXSPAS

We run in production DB2 system some SQL UPDATE statements.
Each statement has a lot of references to the same UDF in the SQL WHERE clause:

UPDATE xx.tablename
SET col1 = 'xx'
WHERE
col2 = xx.UDF_name(CHAR('2011-11-11-08.15.45.500000')) OR
col2 = xx.UDF_name(CHAR('...')) OR

and so on.
The appropriate WLM environment was defined as "Managed by WLM", so WLM can start a lot of servers to fullfil the requests.
Unfortunately each server/each request needs common storage in the E-SQA. This leads to virtual storage constraint.
IPL was necessary to come out of the situation.

We have discussed these behaviour with DB2 development team during V12-CERT-2017.
  • Guest
    Reply
    |     Nov 4, 2021

    It seems that a large amount of common storage is used by MSTR for each stored procedure address space which is started. If a single thread uses thousands of UDFs before committing this can be enough to exhaust available ECSA (ESQA leaks into ECSA) and can bring down an lpar. In my experience we see about 28K common storage taken by MSTR per sp address space which seems excessive. I agree with the request to limit the total number of stored procedure address spaces to be started for an application environment, but it would also be good if zparm MAX_ST_PROCS (for a single thread) would also limit UDFs not just Stored procedures. Possibly this warrants a new AHA.


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