DB2 FOR LUW / DB2FORLUW / B10 - DB2

Customer observed SQL2049N rc=2 when setting
DB2_DATABASE_CF_MEMORY  equal to 0.

As per the documentation link below, the expected behavior when
DB2_DATABASE_CF_MEMORY is set to 0, and cf_db_mem_sz is set to
automatic is that the database should be created with the
smallest possible size of 32,768 4K pages.

https://www.ibm.com/docs/en/db2/11.5?topic=configuration-cf-memo
ry-parameter

Instead what we see is the SCA is assigned a value of ~800GB,
which on most systems will lead to SQL2049N rc=2

021-05-27-18.22.28.304184-240 E138651E1289          LEVEL:
Severe
PID     : 16415                TID : 140580524910336 PROC :
db2sysc 0
INSTANCE: db2inst1               NODE : 000            DB   :
SAMPLE
APPHDL  : 0-59                 APPID: *N0.db2inst1.210527222227
AUTHID  : DB2INST1               HOSTNAME: localhost
EDUID   : 31                   EDUNAME: db2agnts 0
FUNCTION: DB2 UDB, Shared Data Structure Abstraction Layer for
CF, SAL_MANAGEMENT_PORT_HANDLE::SAL_ManagementAllocateOneStruct,
probe:7974
MESSAGE : CA RC= 2147879427
DATA #1 : String, 61 bytes
CF structure allocation exception (structType,target_sz,SID):
DATA #2 : SAL Structure Type, PD_TYPE_SAL_STRUCT_TYPE, 8 bytes
Structure type 2 : sca
DATA #3 : unsigned integer, 4 bytes
204256256

****************************************************************
* USERS AFFECTED:                                              *
* all                                                          *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to 11.1 FP7 or later                                 *
****************************************************************

Unset DB2_DATABASE_CF_MEMORY, restart the pureScale instance.

****************************************************************
* USERS AFFECTED:                                              *
* all                                                          *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to 11.1 FP7 or later                                 *
****************************************************************

Upgrade to 11.1 FP7 or later

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

28.06.2021
23.11.2021
23.11.2021