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A few changes from repmgrd and improve the SQL of the repl_status

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view in order to actually show something useful
This commit is contained in:
Jaime Casanova
2010-10-01 02:26:39 -05:00
parent 533a4e31a0
commit 5cd9e3957c
3 changed files with 37 additions and 21 deletions
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22
repmgr.sql
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@@ -26,11 +26,23 @@ CREATE TABLE repl_monitor (
/*
* A useful view
* 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
SELECT *, now() - (select max(last_monitor_time) from repl_monitor b
where b.primary_node = a.primary_node
and b.standby_node = a.standby_node)
FROM repl_monitor a;
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;