Recently we have some customers are meeting such kind of error when connecting REMOTE oracle database:
C *** ERROR => SAP kernel 7XX with basic release 7XX only supported with Oracle server >= 11.2
Because of this error, the database connection was not closed, then the further db connection failed again, again, leaving many unclosed connection, thus overflow error may occur:
“Max. number of open Oracle db connections (16) exceeded. “
This error occurs after kernel upgrade. This error is supposed to only occur for SAP on oracle, but not for oracle as a remote database. There is little limitation on remote oracle, so most of oracle versions are still supported by sap kernels as long as the oracle is a secondary database/remote database. New oracle dbsl will be released to fix this issue.
So whenever you are meeting this error for remote oracle, please check if the dbsl is the latest. In case the latest oracle dbsl is not solved, please contact SAP support. Please do not simply upgrade the remote database as the error “implicts”.