PG_VARIABLE_INFO

PG_VARIABLE_INFO records information about transaction IDs and OIDs of the current node in a cluster.

**Table 1** PG_VARIABLE_INFO columns
Name	Type	Description
node_name	text	Node name.
next_oid	oid	OID generated next time on the node.
next_xid	xid	Transaction ID generated next time on the node.
oldest_xid	xid	Oldest transaction ID on the node.
xid_vac_limit	xid	Critical point (transaction ID) that triggers forcible autovacuum.
oldest_xid_db	oid	OID of the database that has the minimum datafrozenxid on the node.
last_extend_csn_logpage	xid	Number of the last extended CSNlog page.
start_extend_csn_logpage	xid	Number of the page from which CSNlog extending starts.
next_commit_seqno	xid	CSN generated next time on the node.
latest_completed_xid	xid	Latest transaction ID on the node after the transaction commission or rollback.
startup_max_xid	xid	Last transaction ID before the node is powered off.