This table contains information about NDB Cluster node
processes; each node is represented by the row in the table.
Only nodes that are connected to the cluster are shown in this
table. You can obtain information about nodes that are
configured but not connected to the cluster from the
The following table provides information about the columns in
processes 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 21.375 Columns of the nodes table
||integer||The node's unique node ID in the cluster|
||string||Type of node (management, data, or API node; see text)|
||string||Version of the
||integer||This node's process ID|
||integer||Process ID of this node's angel process|
||string||Name of the executable|
||string||Service URI of this node (see text)|
node_id is the ID assigned to this node in
node_type column displays one of the
following three values:
MGM: Management node.
NDB: Data node.
API: API or SQL node.
For an executable shipped with the NDB Cluster distribution,
node_version shows the two-part MySQL NDB
Cluster version string, such as
5.7.21-ndb-7.6.4, that it was
compiled with. See
Version strings used in NDB Cluster software, for more
process_id is the node executable's
process ID as shown by the host operating system using a process
display application such as top on Linux, or
the Task Manager on Windows platforms.
angel_process_id is the system process ID for
the node's angel process, which ensures that a data node or
SQL is automatically restarted in cases of failures. For
management nodes and API nodes other than SQL nodes, the value
of this column is
process_name column shows the name of the
running executable. For management nodes, this is
ndb_mgmd. For data nodes, this is
ndbd (single-threaded) or
ndbmtd (multi-threaded). For SQL nodes, this
mysqld. For other types of API nodes, it
is the name of the executable program connected to the cluster;
NDB API applications can set a custom value for this using
service_URI shows the service network
address. For management nodes and data nodes, the scheme used is
ndb://. For SQL nodes, this is
mysql://. By default, API nodes other than
SQL nodes use
ndb:// for the scheme; NDB API
applications can set this to a custom value using
regardless of the node type, the scheme is followed by the IP
address used by the NDB transporter for the node in question.
For management nodes and SQL nodes, this address includes the
port number (usually 1186 for management nodes and 3306 for SQL
nodes). If the SQL node was started with
--bind-address, this address is
used instead of the transporter address, unless the bind address
is set to
Additional path information may be included in the
service_URI value for an SQL node reflecting
various configuration options; for example,
that the SQL node was started with
that replication is enabled for this SQL node.
processes table was added in NDB 7.5.7
and NDB 7.6.2.