DB2 FOR LUW / DB2FORLUW / B50 - DB2

After migrating to DB2 v11.5, DB2 might receive errors like
this:

2021-03-29-01.07.30.756190-420 I2317619E559          LEVEL:
Severe
PID     : 1298                 TID : 140541102647040 PROC :
db2sysc 0
INSTANCE: db2inst1             NODE : 000            DB   : XYZ
APPHDL  : 0-250                APPID: *LOCAL.zzzzzzzzzzzzzzzzz
UOWID   : 5                    ACTID: 1
AUTHID  : XYZABC               HOSTNAME: hostname
EDUID   : 26                   EDUNAME: db2agent (XYZ) 0
FUNCTION: DB2 UDB, catcache support, sqlrlc_fed_fetch_3pn_pd,
probe:528
MESSAGE : invalid federated three part name


The problem is likely to occur when a CREATE SERVER name is the
same as a SCHEMA name in the database.   This can also create
many FODC_AppErr folders, filling up the DIAGPATH on the
database server.


In some cases this can cause DB2 to crash as well.   The
db2diag.log may show the db2wdog process crashing with a signal
11 like this:

2021-03-31-10.50.48.761389-420 E22948E473            LEVEL:
Error
PID     : 20696                TID : 139937609410304 PROC :
db2wdog 0 [XYZ]
INSTANCE: db2inst1             NODE : 000
HOSTNAME: hostname
EDUID   : 2                    EDUNAME: db2wdog 0 [XYZ]
FUNCTION: DB2 UDB, base sys utilities, sqleWatchDog, probe:10594
DATA #1 : Process ID, 4 bytes
20698
DATA #2 : Hexdump, 8 bytes
0x00007F45C37FB3B8 : 0101 0000 0B00 0000

****************************************************************
* USERS AFFECTED:                                              *
* After migrating from v10.5.9 to v11.5.5 customer is getting  *
* many FODC_AppErr folders generated with -901 exceptions.     *
* MESSAGE : invalid federated three part name                  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to db2 v11.5.6                                       *
****************************************************************

Change the CREATE SERVER name to something different than any
SCHEMA name in the database.

****************************************************************
* USERS AFFECTED:                                              *
* After migrating from v10.5.9 to v11.5.5 customer is getting  *
* many FODC_AppErr folders generated with -901 exceptions.     *
* MESSAGE : invalid federated three part name                  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Upgrade to db2 v11.5.6                                       *
****************************************************************

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

05.04.2021
16.06.2021
16.06.2021