Db2 Monitoring

Hi all,

 I checked logs.Sometimes it shows this error.What is the issue and how we can resolve? please help me out.

AUTHID  : APP_USER             HOSTNAME: UPCDCDDMB01

EDUID   : 12003                EDUNAME: db2agent (UPCMBDB) 0

FUNCTION: DB2 UDB, Self tuning memory manager, stmmSimulateSortMerge, probe:3355

MESSAGE : ZRC=0x87AE0165=-2018639515=STMM_SEVERE_ERROR

          "Severe error encountered in self tuning memory manager"

DATA #1 : String, 91 bytes

ERROR simulation of real configuration has failed - not reporting benefit for this operator

2017-02-27-15.39.51.884502+330 I288755625E709        LEVEL: Warning

PID     : 4431                 TID : 47011483084544  PROC : db2sysc 0

INSTANCE: db2inst1             NODE : 000            DB   : UPCMBDB

APPHDL  : 0-36663              APPID: 10.1.1.21.49426.170305100814

AUTHID  : APP_USER             HOSTNAME: UPCDCDDMB01

EDUID   : 7659                 EDUNAME: db2agent (UPCMBDB) 0

FUNCTION: DB2 UDB, Self tuning memory manager, stmmSimulateSortMerge, probe:3355

MESSAGE : ZRC=0x87AE0165=-2018639515=STMM_SEVERE_ERROR

          "Severe error encountered in self tuning memory manager"

DATA #1 : String, 91 bytes

ERROR simulation of real configuration has failed - not reporting benefit for this operator

2017-02-27-15.40.34.263479+330 I288756335E709        LEVEL: Warning

PID     : 4431                 TID : 47013009811200  PROC : db2sysc 0

INSTANCE: db2inst1             NODE : 000            DB   : UPCMBDB

APPHDL  : 0-45651              APPID: 10.1.1.25.43103.170305120813

AUTHID  : APP_USER             HOSTNAME: UPCDCDDMB01

EDUID   : 12031                EDUNAME: db2agent (UPCMBDB) 0

FUNCTION: DB2 UDB, Self tuning memory manager, stmmSimulateSortMerge, probe:3355

MESSAGE : ZRC=0x87AE0165=-2018639515=STMM_SEVERE_ERROR

          "Severe error encountered in self tuning memory manager"

DATA #1 : String, 91 bytes

ERROR simulation of real configuration has failed - not reporting benefit for this operator

2017-02-27-15.41.21.620961+330 I288757045E709        LEVEL: Warning

PID     : 4431                 TID : 46912841443072  PROC : db2sysc 0

INSTANCE: db2inst1             NODE : 000            DB   : UPCMBDB

APPHDL  : 0-46753              APPID: 10.1.1.25.43243.170305120906

AUTHID  : APP_USER             HOSTNAME: UPCDCDDMB01

EDUID   : 12033                EDUNAME: db2agent (UPCMBDB) 0

FUNCTION: DB2 UDB, Self tuning memory manager, stmmSimulateSortMerge, probe:3355

MESSAGE : ZRC=0x87AE0165=-2018639515=STMM_SEVERE_ERROR

          "Severe error encountered in self tuning memory manager"

DATA #1 : String, 91 bytes

ERROR simulation of real configuration has failed - not reporting benefit for this operator

[db2inst1@UPCDCDDMB01 db2dump]$