Useful PostgreSQL utilities
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-- List active replication connections
SELECT client_addr AS client
, usename AS user
, application_name AS name
, state, sync_state AS mode, backend_xmin
, (pg_wal_lsn_diff(CASE WHEN pg_is_in_recovery() THEN pg_last_wal_replay_lsn() ELSE pg_current_wal_lsn() END,sent_lsn)/1024.0/1024)::numeric(10,1) AS pending_mb
, (pg_wal_lsn_diff(sent_lsn,write_lsn)/1024.0/1024)::numeric(10,1) AS write_mb
, (pg_wal_lsn_diff(write_lsn,flush_lsn)/1024.0/1024)::numeric(10,1) AS flush_mb
, (pg_wal_lsn_diff(flush_lsn,replay_lsn)/1024.0/1024)::numeric(10,1) AS replay_mb
, ((pg_wal_lsn_diff(CASE WHEN pg_is_in_recovery() THEN sent_lsn ELSE pg_current_wal_lsn() END,replay_lsn))::bigint/1024.0/1024)::numeric(10,1) AS total_mb
, replay_lag::interval(0) replay_lag
FROM pg_stat_replication;