Questions about NDB API.

[Moon's Father]

  We use MySQL NDB event API to monitor DB data change. But I have two
confusion to consult with us.

a.       How this mechanism works internally in mySQL?

  b.       If an event is defined on some columns of a table and DML
operations is not quite often (say one update/delete/insert per minute),
when the table is populated with large amount of data (say 10 million
records), what’s the performance impact?


Any reply is appreciated.