OCI-00841
The Automatic Memory Management (AMM) feature encountered a problem during initialization.
Cause
AMM is enabled in the initialization file using the MEMORY_TARGET parameter. The database is encountering a problem while trying to use the AMM feature. The possible causes for this error are either the operating system did not support AMM or AMM was not configured correctly.
Action
Refer to the documentation to verify if the operating system supports AMM. If not, remove AMM related parameters from the initialization file. On Linux, check if /dev/shm is mounted. The database alert log file contains additional information about the use of /dev/shm on the Linux platform and further steps that need to be done.