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CREATE USER repmgr;
CREATE SCHEMA repmgr;
/*
* The table repl_nodes keeps information about all machines in
* a cluster
*/
drop table if exists repl_nodes cascade;
CREATE TABLE repl_nodes (
id integer primary key,
cluster text not null, -- Name to identify the cluster
conninfo text not null
);
ALTER TABLE repl_nodes OWNER TO repmgr;
/*
* Keeps monitor info about every node and their relative "position"
* to primary
*/
drop table if exists repl_monitor cascade;
CREATE TABLE repl_monitor (
primary_node INTEGER NOT NULL,
standby_node INTEGER NOT NULL,
last_monitor_time TIMESTAMP WITH TIME ZONE NOT NULL,
last_wal_primary_location TEXT NOT NULL,
last_wal_standby_location TEXT NOT NULL,
replication_lag BIGINT NOT NULL,
apply_lag BIGINT NOT NULL
);
ALTER TABLE repl_monitor OWNER TO repmgr;
/*
* This view shows the latest monitor info about every node.
* Interesting thing to see:
* replication_lag: in bytes (this is how far the latest xlog record
* we have received is from master)
* apply_lag: in bytes (this is how far the latest xlog record
* we have applied is from the latest record we
* have received)
* time_lag: how many seconds are we from being up-to-date with master
*/
drop view if exists repl_status;
CREATE VIEW repl_status AS
WITH monitor_info AS (SELECT *, ROW_NUMBER() OVER (PARTITION BY primary_node, standby_node
ORDER BY last_monitor_time desc)
FROM repl_monitor)
SELECT primary_node, standby_node, last_monitor_time, last_wal_primary_location,
last_wal_standby_location, pg_size_pretty(replication_lag) replication_lag,
pg_size_pretty(apply_lag) apply_lag,
age(now(), last_monitor_time) AS time_lag
FROM monitor_info a
WHERE row_number = 1;
ALTER VIEW repl_status OWNER TO repmgr;
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