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Translate PostgreSQL Lag in bytes
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-- Calculate From : http://munin-monitoring.org/browser/munin/plugins/node.d/postgres_streaming_.in | |
-- with help : http://www.postgresql.org/docs/9.3/static/monitoring-stats.html#PG-STAT-REPLICATION-VIEW | |
-- http://eulerto.blogspot.fr/2011/11/understanding-wal-nomenclature.html | |
create or replace function CalculateNumericalOffset(text) | |
returns bigint | |
language sql | |
as $$ | |
select ('x'||lpad( 'ff000000', 16, '0'))::bit(64)::bigint | |
* ('x'||lpad( split_part( $1 ,'/',1), 16, '0'))::bit(64)::bigint | |
+ ('x'||lpad( split_part( $1 ,'/',2), 16, '0'))::bit(64)::bigint ; | |
$$ | |
; | |
create or replace function pg_streaming_lag( text, text ) | |
returns bigint | |
language sql | |
as $$ | |
select CalculateNumericalOffset( $1 ) - CalculateNumericalOffset( $2 ) ; | |
$$ | |
; | |
select pid, backend_start, sync_state, | |
pg_size_pretty(pg_streaming_lag(sent_location,write_location)) as write_lag, | |
pg_size_pretty(pg_streaming_lag(sent_location,flush_location)) as flush_lag, | |
pg_size_pretty(pg_streaming_lag(sent_location,replay_location) ) as replay_lag | |
from pg_stat_replication ; |
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