PG_VARIABLE_INFO
PGXC_VARIABLE_INFO records information about transaction IDs and OIDs of the current node in a cluster.
| 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 commit or rollback. |
| startup_max_xid | xid | Last transaction ID before the node is powered off. |
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