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Sets the percentage of the maximum memory allocated to the event buffer (ndb_eventbuffer_max_alloc) that should be available in event buffer after reaching the maximum, before starting to buffer again. 

• ndb_eventbuffer_max_alloc 

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Sets the maximum amount memory (in bytes) that can be allocated for buffering events by the NDB API. 0 means that no limit is imposed, and is the default. 

• ndb_extra_logging 

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This variable enables recording in the MySQL error log of information specific to the NDB  storage engine. 

When this variable is set to 0, the only information specific to NDB  that is written to the MySQL error log relates to transaction handling. If it set to a value greater than 0 but less than 10, NDB  table schema and connection events are also logged, as well as whether or not conflict resolution is in use, and other NDB errors and information. If the value is set to 10 or more, information about NDB  internals, such as the 

