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Memory notification in alert log

xoxomos
xoxomos asked
on
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Last Modified: 2007-11-27
I'm posting part of an alert.log.  Can someone give me a clue what's happening and what should be done about it?

Memory Notification: Library Cache Object loaded into SGA
Heap size 2459K exceeds notification threshold (2048K)
KGL object name :SELECT /*+rule*/ SYS_XMLGEN(VALUE(KU$), XMLFORMAT.createFormat2('TABLE_DATA_T', '7')), 0 ,KU
$.BASE_OBJ.NAME ,KU$.BASE_OBJ.OWNER_NAME ,'TABLE' ,to_char(KU$.BYTES_ALLOC) ,to_char(KU$.ET_PARALLEL) ,KU$.FG
AC ,KU$.NONSCOPED_REF ,KU$.XMLSCHEMACOLS ,KU$.NAME ,KU$.NAME ,'TABLE_DATA' ,KU$.PART_NAME ,KU$.SCHEMA_OBJ.OWN
ER_NAME ,KU$.TS_NAME ,KU$.TRIGFLAG ,decode(KU$.SCHEMA_OBJ.TYPE_NUM,2,decode(bitand(KU$.PROPERTY,8192),8192,'N
ESTED TABLE','TABLE'),19,'PARTITION',20,'PARTITION','SUBPARTITION') ,to_char(KU$.UNLOAD_METHO
Sat Jan 20 20:30:24 2007
Memory Notification: Library Cache Object loaded into SGA
Heap size 2458K exceeds notification threshold (2048K)
Details in trace file /u01/app/oracle/product/10.2.0.1/db_1/admin/paebdvl/bdump/paebdvl_dw01_23219.trc
KGL object name :SELECT /*+rule*/ SYS_XMLGEN(VALUE(KU$), XMLFORMAT.createFormat2('TABLE_DATA_T', '7')), 0 ,KU
$.BASE_OBJ.NAME ,KU$.BASE_OBJ.OWNER_NAME ,'TABLE' ,to_char(KU$.BYTES_ALLOC) ,to_char(KU$.ET_PARALLEL) ,KU$.FG
AC ,KU$.NONSCOPED_REF ,KU$.XMLSCHEMACOLS ,KU$.NAME ,KU$.NAME ,'TABLE_DATA' ,KU$.PART_NAME ,KU$.SCHEMA_OBJ.OWN
ER_NAME ,KU$.TS_NAME ,KU$.TRIGFLAG ,decode(KU$.SCHEMA_OBJ.TYPE_NUM,2,decode(bitand(KU$.PROPERTY,8192),8192,'N
ESTED TABLE','TABLE'),19,'PARTITION',20,'PARTITION','SUBPARTITION') ,to_char(KU$.UNLOAD_METHO
Sat Jan 20 20:32:13 2007
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Commented:
WARNING:Oracle instance running on a system with low open file descriptor
        limit. Tune your system to increase this limit to avoid
        severe performance degradation.

Commented:
ulimit -a lists all resource limits
-c Specifies the number of blocks for a core file
-d Specifies the number of kylobytes for the data area
-f Specifies the number of blocks that may be written to a file
-n Specifies one more than the number of files that may be open at once.
-s Specifies the number  of kylobytes for the stack area
-t Specifies the number of seconds that may be used by each process
-v Specifies the number of kylobytes for virtual memory.

One of our biggest database has the following descriptions:

<server name>> ulimit -a
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         unlimited
stack(kbytes)        8192
coredump(blocks)     unlimited
nofiles(descriptors) 256
vmemory(kbytes)      unlimited


So change it accordingly.
Memory Notification: Library Cache Object loaded into SGA
Heap size 2458K exceeds notification threshold (2048K)

This message  is just informational only. Need not  do  any thing on that..Infact there are  "_" parameters .They will just stop this message thats it.
This one is on us!
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Author

Commented:
Is that also true for the open file descriptor message?

 WARNING:Oracle instance running on a system with low open file descriptor
        limit. Tune your system to increase this limit to avoid
        severe performance degradation.

OPen file descriptor is another issue.. It has to be changed at OS level. That is not same as the memory description issue we discussed in this thread.

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