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mysqld  exposes these counters as system status variables; their values can be read in the output of SHOW STATUS , or by querying the Performance Schema session_status  or global_status  table. By comparing the values before and after statements operating on NDB  tables, you can observe the corresponding actions taken on the API level, and thus the cost of performing the statement. 

You can list all of these status variables using the following SHOW STATUS  statement: 

mysql> SHOW STATUS LIKE ’ndb_api%’; 

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