Oracle Database Discussions

Hi all,
We have oracle 10g RAC on IBM AIX.
Recently checking Alert log i found out this notification

********************************************************************************************
Wed Oct 21 09:13:34 2009
Memory Notification: Library Cache Object loaded into SGA
Heap size 3722K exceeds notification threshold (2048K)
KGL object name :XDB.XDbD/PLZ01TcHgNAgAIIegtw==
Wed Oct 21 09:13:37 2009
Memory Notification: Library Cache Object loaded into SGA
Heap size 4072K exceeds notification threshold (2048K)
Details in trace file /Oracle/admin/KKMS/udump/kkms1_ora_786660.trc
KGL object name :XDB.XD/HngR5i2kv7gM4IjoliS/g==
Wed Oct 21 09:13:55 2009
Memory Notification: Library Cache Object loaded into SGA
Heap size 3103K exceeds notification threshold (2048K)
Details in trace file /Oracle/admin/KKMS/udump/kkms1_ora_786660.trc
KGL object name :SELECT TOWNER, TNAME, NAME, LENGTH, PRECISION, SCALE, TYPE, ISN
ULL, CONNAME, COLID, INTCOLID, SEGCOLID, COMMENT$, DEFAULT$, DFLTLEN
, ENABLED, DEFER, FLAGS, COLPROP, ADTNAME, ADTOWNER, CHARSETID,
CHARSETFORM, FSPRECISION, LFPRECISION, CHARLEN, TFLAGS, TYPESYN,
100 FROM SYS.EXU9COO WHERE TOBJID = :1 ORDER BY INTCOLID
Wed Oct 21 09:30:09 2009
Thread 1 advanced to log sequence 667
Current log# 2 seq# 667 mem# 0: +DG_DB_ASM/kkms/onlinelog/group_2.262.67594681
********************************************************************************************

Does above notification means something bad coming up?

What steps will help me to overcome above notification


Thanks,
Neerav