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Updated on 2023-10-31 GMT+08:00
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PGXC_NODE

PGXC_NODE records information about cluster nodes.

Table 1 PGXC_NODE columns

Name

Type

Description

node_name

name

Node name

node_type

"char"

Node type

C: CN

D: DN

node_port

integer

Port ID of the node

node_host

name

Host name or IP address of a node. (If a virtual IP address is configured, its value is a virtual IP address.)

node_port1

integer

Port number of a replication node

node_host1

name

Host name or IP address of a replication node. (If a virtual IP address is configured, its value is a virtual IP address.)

hostis_primary

boolean

Whether a switchover occurs between the primary and the standby server on the current node

nodeis_primary

boolean

Whether the current node is preferred to execute non-query operations in the replication table

nodeis_preferred

boolean

Whether the current node is preferred to execute queries in the replication table

node_id

integer

Node identifier

sctp_port

integer

Specifies the port used by the TCP proxy communication library or SCTP communication library of the primary node to listen to the data channel.

control_port

integer

Specifies the port used by the TCP proxy communication library or SCTP communication library of the primary node to listen to the control channel.

sctp_port1

integer

Specifies the port used by the TCP proxy communication library or SCTP communication library of the standby node to listen to the data channel.

control_port1

integer

Specifies the port used by the TCP proxy communication library or SCTP communication library of the standby node to listen to the control channel.

nodeis_central

boolean

Indicates that the current node is the central node.

Example

Query the number of DNs on a node:

SELECT count(node_name),node_host FROM pgxc_node WHERE node_type='D' GROUP BY 2;
 count |   node_host
-------+---------------
     1 | 192.**.**.10
     1 | 192.**.**.11
     1 | 192.**.**.12
(3 rows)

Query the CN and DN information of the cluster:

Parent topic: System Catalogs