This table contains information on the status of data nodes. For each data node that is running in the cluster, a corresponding row in this table provides the node's node ID, status, and uptime. For nodes that are starting, it also shows the current start phase.

The following table provides information about the columns in the nodes 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.

The uptime column shows the time in seconds that this node has been running since it was last started or restarted. This is a BIGINT value. This figure includes the time actually needed to start the node; in other words, this counter starts running the moment that ndbd or ndbmtd is first invoked; thus, even for a node that has not yet finished starting, uptime may show a non-zero value.

The status column shows the node's current status. This is one of: NOTHING, CMVMI, STARTING, STARTED, SINGLEUSER, STOPPING_1, STOPPING_2, STOPPING_3, or STOPPING_4. When the status is STARTING, you can see the current start phase in the start_phase column (see later in this section). SINGLEUSER is displayed in the status column for all data nodes when the cluster is in single user mode (see Section 5.6, “MySQL Cluster Single User Mode”). Seeing one of the STOPPING states does not necessarily mean that the node is shutting down but can mean rather that it is entering a new state; for example, if you put the cluster in single user mode, you can sometimes see data nodes report their state briefly as STOPPING_2 before the status changes to SINGLEUSER.

The start_phase column uses the same range of values as those used in the output of the ndb_mgm client node_id STATUS command (see Section 5.2, “Commands in the MySQL Cluster Management Client”). If the node is not currently starting, then this column shows 0. For a listing of MySQL Cluster start phases with descriptions, see Section 5.1, “Summary of MySQL Cluster Start Phases”.

Nodes that are stopped are not accounted for in this table. Suppose that you have a MySQL Cluster with 2 data nodes (node IDs 1 and 2), and all nodes are running normally, then this table contains 2 rows, 1 for each data node:

mysql> USE ndbinfo;
Database changed
mysql> SELECT * FROM nodes;
+---------+--------+---------+-------------+
| node_id | uptime | status  | start_phase |
+---------+--------+---------+-------------+
|       1 |  11776 | STARTED |           0 |
|       2 |  11761 | STARTED |           0 |
+---------+--------+---------+-------------+
2 rows in set (0.04 sec)

If you shut down one of the nodes, only the node that is still running is reflected in the output of this SELECT statement, as shown here:

ndb_mgm> 2 STOP
Node 2: Node shutdown initiated
Node 2: Node shutdown completed.
Node 2 has shutdown.

mysql> SELECT * FROM nodes;
+---------+--------+---------+-------------+
| node_id | uptime | status  | start_phase |
+---------+--------+---------+-------------+
|       1 |  11807 | STARTED |           0 |
+---------+--------+---------+-------------+
1 row in set (0.02 sec)