ndbinfo: The NDB Cluster Information Database • scan_errors • scan_fragments • scan_fragment_errors • transactions • transaction_errors • read_key_ops • write_key_ops • index_key_ops • key_op_errors • node_id Notes 23.5.14.52 The ndbinfo threadblocks Table 4588 The  threadblocks  table contains the following columns: The  threadblocks  table associates data nodes, threads, and instances of  NDB  kernel blocks. The  block_instance  column provides the  DBTC  kernel block instance number. You can use this together with the block name to obtain information about specific threads from the  threadblocks  table. Based on duration of all unsuccessful key read or write operations, tracked against both the API or data node requesting them and the data node executing them. Based on duration of successful primary key writes, tracked against both the API or data node requesting them and the data node executing them. Based on duration of successful unique index key operations, tracked against both the API or data node requesting them and the data node executing reads of base tables. Based on duration of successful primary key reads with locks. Tracked against both the API or data node requesting them and the data node executing them. Based on duration of failing transactions from start to point of failure, tracked against the API or data nodes requesting them. Based on duration of failed fragment scans from opening to closing, tracked against the data nodes executing them Based on duration of successful transactions from beginning until sending of commit  ACK , tracked against the API or data nodes requesting them. Stateless transactions are not included. Based on duration of successful fragment scans from opening to closing, tracked against the data nodes executing them Based on duration of failed scans from opening to closing, tracked against the API or data nodes requesting them.