The server_operations table contains entries for all ongoing NDB operations that the current SQL node (MySQL Server) is currently involved in. It effectively is a subset of the cluster_operations table, in which operations for other SQL and API nodes are not shown.
The server_operations table contains the following columns:
mysql_connection_id
MySQL Server connection ID
node_id
Node ID
block_instance
Block instance
transid
Transaction ID
operation_type
Operation type (see text for possible values)
state
Operation state (see text for possible values)
tableid
Table ID
fragmentid
Fragment ID
client_node_id
Client node ID
client_block_ref
Client block reference
tc_node_id
Transaction coordinator node ID
tc_block_no
Transaction coordinator block number
tc_block_instance
Transaction coordinator block instance
The mysql_connection_id is the same as the connection or session ID shown in the output of SHOW PROCESSLIST. It is obtained from the INFORMATION_SCHEMA table NDB_TRANSID_MYSQL_CONNECTION_MAP.
block_instance refers to an instance of a kernel block. Together with the block name, this number can be used to look up a given instance in the threadblocks table.
The transaction ID (transid) is a unique 64-bit number which can be obtained using the NDB API's getTransactionId() method. (Currently, the MySQL Server does not expose the NDB API transaction ID of an ongoing transaction.)
The operation_type column can take any one of the values READ, READ-SH, READ-EX, INSERT, UPDATE, DELETE, WRITE, UNLOCK, REFRESH, SCAN, SCAN-SH, SCAN-EX, or <unknown>.
The state column can have any one of the values ABORT_QUEUED, ABORT_STOPPED, COMMITTED, COMMIT_QUEUED, COMMIT_STOPPED, COPY_CLOSE_STOPPED, COPY_FIRST_STOPPED, COPY_STOPPED, COPY_TUPKEY, IDLE, LOG_ABORT_QUEUED, LOG_COMMIT_QUEUED, LOG_COMMIT_QUEUED_WAIT_SIGNAL, LOG_COMMIT_WRITTEN, LOG_COMMIT_WRITTEN_WAIT_SIGNAL, LOG_QUEUED, PREPARED, PREPARED_RECEIVED_COMMIT, SCAN_CHECK_STOPPED, SCAN_CLOSE_STOPPED, SCAN_FIRST_STOPPED, SCAN_RELEASE_STOPPED, SCAN_STATE_USED, SCAN_STOPPED, SCAN_TUPKEY, STOPPED, TC_NOT_CONNECTED, WAIT_ACC, WAIT_ACC_ABORT, WAIT_AI_AFTER_ABORT, WAIT_ATTR, WAIT_SCAN_AI, WAIT_TUP, WAIT_TUPKEYINFO, WAIT_TUP_COMMIT, or WAIT_TUP_TO_ABORT. (If the MySQL Server is running with ndbinfo_show_hidden enabled, you can view this list of states by selecting from the ndb$dblqh_tcconnect_state table, which is normally hidden.)
You can obtain the name of an NDB table from its table ID by checking the output of ndb_show_tables.
The fragid is the same as the partition number seen in the output of ndb_desc --extra-partition-info (short form -p).
In client_node_id and client_block_ref, client refers to an NDB Cluster API or SQL node (that is, an NDB API client or a MySQL Server attached to the cluster).
The block_instance and tc_block_instance column provide NDB kernel block instance numbers. You can use these to obtain information about specific threads from the threadblocks table.