ORA-600 [17112] error in Alert.log file

Hi all,

DB is 8.1.7.3.0/Win2K.

I got the following errors are in the ALERT file.

ORA-00600: internal error code, arguments: [17112], [1680810380], [], [], [], [], [], [].

SGA is as below:

Fixed Size 75804
Variable Size 553979904
Database Buffers 614400000
Redo Buffers 10493952

In my OEM Perf.Monitor screen, free SGA shows almost NILL. Right now, free SGA is only 9MB.

Could anybody tell me what is the cause and possible fix for this error?

Thanks in Adv.

Oracle has detected that the magic number in a memory chunk header has been overwritten.
This is a heap (in memory) corruption and there is no underlying data corruption.
The error may occur in the one of the process specific heaps (the Call heap, PGA heap, or session heap) or in the shared heap (SGA).

See Note:47411.1 on metalink.

HTH