ORA-12808：cannot set string_INSTANCES greater than number of instances string
错误码
错误描述：cannot set string_INSTANCES greater than number of instances string
错误原因：An attempt was made to set SCAN_INSTANCES or CACHE_INSTANCES using the ALTER SYSTEM command to a value larger than the number of available instances.
解决方法：See the accompanying message for the current allowable maximum value, or set SCAN_INSTANCES / CACHE_INSTANCES to ALL.
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