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Подскажите, пожалуйста, почему может возникать предупреждение:
"The DATABASE_MEMORY parameter could not be decreased"

Контекст:

2011-01-31-17.57.43.007339+180 I69235593E512 LEVEL: Info
PID : 3698 TID : 140423972514128PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : IGPG
APPHDL : 0-228 APPID: *LOCAL.DB2.110128074903
AUTHID : IGPG
EDUID : 168 EDUNAME: db2stmm (IGPG) 0
FUNCTION: DB2 UDB, buffer pool services, sqlbAlterBufferPoolAct, probe:90
MESSAGE : Altering bufferpool "IBMDEFAULTBP" From: "1551" <automatic> To:
"2326" <automatic>

2011-01-31-17.57.53.037639+180 I69236106E513 LEVEL: Info
PID : 3698 TID : 140435825617232PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DNC
APPHDL : 0-92 APPID: *LOCAL.DB2.110128074648
AUTHID : DNC
EDUID : 134 EDUNAME: db2stmm (DNC) 0
FUNCTION: DB2 UDB, buffer pool services, sqlbAlterBufferPoolAct, probe:90
MESSAGE : Altering bufferpool "DNC_ARCH_BP" From: "126739" <automatic> To:
"190108" <automatic>

2011-01-31-17.57.55.829212+180 I69236620E554 LEVEL: Event
PID : 3698 TID : 140435825617232PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DNC
APPHDL : 0-92 APPID: *LOCAL.DB2.110128074648
AUTHID : DNC
EDUID : 134 EDUNAME: db2stmm (DNC) 0
FUNCTION: DB2 UDB, access plan manager, sqlra_resize_pckcache, probe:150
CHANGE : APM : Package Cache : FROM "576364625" : TO "864546938" : success
IMPACT : None
DATA #1 : String, 29 bytes
Package Cache Resized (bytes)

2011-01-31-17.57.55.829371+180 I69237175E494 LEVEL: Event
PID : 3698 TID : 140435825617232PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DNC
APPHDL : 0-92 APPID: *LOCAL.DB2.110128074648
AUTHID : DNC
EDUID : 134 EDUNAME: db2stmm (DNC) 0
FUNCTION: DB2 UDB, config/install, sqlfLogUpdateCfgParam, probe:20
CHANGE : STMM CFG DB DNC: "Pckcachesz" From: "145066" <automatic> To: "217599" <automatic>

2011-01-31-17.57.55.840309+180 E69237670E731 LEVEL: Warning
PID : 3698 TID : 140435825617232PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DNC
APPHDL : 0-92 APPID: *LOCAL.DB2.110128074648
AUTHID : DNC
EDUID : 134 EDUNAME: db2stmm (DNC) 0
FUNCTION: DB2 UDB, Self tuning memory manager, stmmDecreaseDBMemOriginatedBySTMM, probe:1606
MESSAGE : ZRC=0x02AE00A5=44957861=STMM_DBMEM_COULD_NOT_BE_DECREASED
"The DATABASE_MEMORY parameter could not be decreased"
DATA #1 : String, 141 bytes
Overflow memory decrease amount exceeds overflow size. DATABASE_MEMORY decrease failed. Decrease amount: 643547136, overflow size: 607584256

2011-01-31-17.57.55.859597+180 I69238402E499 LEVEL: Event
PID : 3698 TID : 140435825617232PROC : db2sysc 0
INSTANCE: db2inst1 NODE : 000 DB : DNC
APPHDL : 0-92 APPID: *LOCAL.DB2.110128074648
AUTHID : DNC
EDUID : 134 EDUNAME: db2stmm (DNC) 0
FUNCTION: DB2 UDB, config/install, sqlfLogUpdateCfgParam, probe:20
CHANGE : STMM CFG DB DNC: "Database_memory" From: "742320" <automatic> To: "647940" <automatic>