Last updated on NOVEMBER 28, 2016
Applies to:Oracle Server - Enterprise Edition - Version: 18.104.22.168
Information in this document applies to any platform.
ERROR: Unable to attach to VLM segment at (nil): window size=0x20000000 size=0x100000000
ORA-00600: internal error code, arguments: [KSMLSGE1], , , , , , 
The 'window size' and 'size' values for the VLM attach error can vary depending on the way
VLM has been implemented.
b) The ORA-00600 will show 'no SGA' when trying to report the 'Current SQL Statement' i.e. :-
Current SQL information unavailable - no SGA.
c) The ORA-00600[ksmlsge1] call stack will typically show hex values as opposed to meaningful function names. However (A) and (B) are sufficient for this article to be considered as a potential solution.
This issue is sometimes observed whereby the alert log defined in BACKGROUND_DUMP_DESTINATION is not the one that is written to and instead we somehow see these messages written into an alert log that is located in $OH/rdbms/admin. When this is the case the normal alert location still is written to normally for general database activities (shutdown/startup etc)
Sign In with your My Oracle Support account
Don't have a My Oracle Support account? Click to get started
Million Knowledge Articles and hundreds of Community platforms