NDB Cluster Configuration Files key: PRIMARY key_len: 4 ref: employees.de.emp_no rows: 1 Extra: Child of ’de’ in pushed join@1 *************************** 4. row *************************** id: 1 select_type: SIMPLE table: t type: ref possible_keys: PRIMARY,emp_no key: emp_no key_len: 4 ref: employees.de.emp_no rows: 19 Extra: Child of ’e’ in pushed join@1 4 rows in set (0.00 sec) Note If inner joined child tables are joined by  ref ,  and  the result is ordered or grouped by a sorted index, this index cannot provide sorted rows, which forces writing to a sorted tempfile. Two additional sources of information about pushed join performance are available: 1. The status variables  Ndb_pushed_queries_defined ,  Ndb_pushed_queries_dropped , Ndb_pushed_queries_executed , and  Ndb_pushed_reads . 2. The counters in the  ndbinfo.counters  table that belong to the  DBSPJ  kernel block. • ndb_log_apply_status • ndb_log_bin A read-only variable which shows whether the server was started with the  --ndb-log-apply-status option. Command-Line Format --ndb-log-apply-status[={OFF|ON}] System Variable ndb_log_apply_status Scope Global Dynamic No SET_VAR  Hint Applies No Type Boolean Default Value OFF Command-Line Format --ndb-log-bin[={OFF|ON}] System Variable ndb_log_bin Scope Global, Session Dynamic No SET_VAR  Hint Applies No Type Boolean Default Value ( ≥  8.0.16-ndb-8.0.16) OFF 4182