Overview of NDB Cluster Configuration Parameters, Options, and Variables • Ndb_api_trans_start_count_slave : Number of transactions started by this replica. • Ndb_api_uk_op_count : Number of operations based on or using unique keys by this MySQL Server (SQL node). • Ndb_api_uk_op_count_session : Number of operations based on or using unique keys in this client session. • Ndb_api_uk_op_count_replica : Number of operations based on or using unique keys by this replica. • Ndb_api_uk_op_count_slave : Number of operations based on or using unique keys by this replica. • Ndb_api_wait_exec_complete_count : Number of times thread has been blocked while waiting for operation execution to complete by this MySQL Server (SQL node). • Ndb_api_wait_exec_complete_count_session : Number of times thread has been blocked while waiting for operation execution to complete in this client session. • Ndb_api_wait_exec_complete_count_replica : Number of times thread has been blocked while waiting for operation execution to complete by this replica. • Ndb_api_wait_exec_complete_count_slave : Number of times thread has been blocked while waiting for operation execution to complete by this replica. • Ndb_api_wait_meta_request_count : Number of times thread has been blocked waiting for metadata-based signal by this MySQL Server (SQL node). • Ndb_api_wait_meta_request_count_session : Number of times thread has been blocked waiting for metadata-based signal in this client session. • Ndb_api_wait_meta_request_count_replica : Number of times thread has been blocked waiting for metadata-based signal by this replica. • Ndb_api_wait_meta_request_count_slave : Number of times thread has been blocked waiting for metadata-based signal by this replica. • Ndb_api_wait_nanos_count : Total time (in nanoseconds) spent waiting for some type of signal from data nodes by this MySQL Server (SQL node). • Ndb_api_wait_nanos_count_session : Total time (in nanoseconds) spent waiting for some type of signal from data nodes in this client session. • Ndb_api_wait_nanos_count_replica : Total time (in nanoseconds) spent waiting for some type of signal from data nodes by this replica. • Ndb_api_wait_nanos_count_slave : Total time (in nanoseconds) spent waiting for some type of signal from data nodes by this replica. • Ndb_api_wait_scan_result_count : Number of times thread has been blocked while waiting for scan-based signal by this MySQL Server (SQL node). • Ndb_api_wait_scan_result_count_session : Number of times thread has been blocked while waiting for scan-based signal in this client session. • Ndb_api_wait_scan_result_count_replica : Number of times thread has been blocked while waiting for scan-based signal by this replica. • Ndb_api_wait_scan_result_count_slave : Number of times thread has been blocked while waiting for scan-based signal by this replica. 4047