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Redefining repl_status view to improve performance, also add an

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index on repl_monitor to speed up even more the view.
This commit is contained in:
Jaime Casanova
2011-06-13 11:58:43 -05:00
parent 3f4ff5a862
commit 4d26e4d21e
2 changed files with 25 additions and 14 deletions
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9
repmgr.sql
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@@ -34,6 +34,7 @@ CREATE TABLE repl_monitor (
);
ALTER TABLE repl_monitor OWNER TO repmgr;
CREATE INDEX idx_repl_monitor_last_monitor_sort ON repl_monitor(last_monitor_time, standby_node);
/*
* This view shows the latest monitor info about every node.
@@ -46,14 +47,12 @@ ALTER TABLE repl_monitor OWNER TO repmgr;
* time_lag: how many seconds are we from being up-to-date with master
*/
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;
FROM repl_monitor
WHERE (standby_node, last_monitor_time) IN (SELECT standby_node, MAX(last_monitor_time)
FROM repl_monitor GROUP BY 1);
ALTER VIEW repl_status OWNER TO repmgr;