17.5.10.5 The ndbinfo cluster_transactions Table

The cluster_transactions table shows information about all ongoing transactions in a MySQL Cluster.

The following table provides information about the columns in the cluster_transactions table. For each column, the table shows the name, data type, and a brief description. Additional information can be found in the notes following the table.

Column NameTypeDescription
node_idintegerNode ID of transaction coordinator
block_instanceintegerTC block instance
transidintegerTransaction ID
statestringOperation state (see text for possible values)
count_operationsintegerNumber of stateful primary key operations in transaction (includes reads with locks, as well as DML operations)
outstanding_operationsintegerOperations still being executed in local data management blocks
inactive_secondsintegerTime spent waiting for API
client_node_idintegerClient node ID
client_block_refintegerClient block reference

The transaction ID 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 state column can have any one of the values CS_ABORTING, CS_COMMITTING, CS_COMMIT_SENT, CS_COMPLETE_SENT, CS_COMPLETING, CS_CONNECTED, CS_DISCONNECTED, CS_FAIL_ABORTED, CS_FAIL_ABORTING, CS_FAIL_COMMITTED, CS_FAIL_COMMITTING, CS_FAIL_COMPLETED, CS_FAIL_PREPARED, CS_PREPARE_TO_COMMIT, CS_RECEIVING, CS_REC_COMMITTING, CS_RESTART, CS_SEND_FIRE_TRIG_REQ, CS_STARTED, CS_START_COMMITTING, CS_START_SCAN, CS_WAIT_ABORT_CONF, CS_WAIT_COMMIT_CONF, CS_WAIT_COMPLETE_CONF, CS_WAIT_FIRE_TRIG_REQ. (If the MySQL Server is running with ndbinfo_show_hidden enabled, you can view this list of states by selecting from the ndb$dbtc_apiconnect_state table, which is normally hidden.)

In client_node_id and client_block_ref, client refers to a MySQL Cluster API or SQL node (that is, an NDB API client or a MySQL Server attached to the cluster).

This table was added in MySQL Cluster NDB 7.2.2.