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PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

How to do it…

The best way to understand things is to look at things the same way that autovacuum does, using a view created with the following query:

CREATE OR REPLACE VIEW av_needed AS SELECT N.nspname, C.relname , pg_stat_get_tuples_inserted(C.oid) AS n_tup_ins , pg_stat_get_tuples_updated(C.oid) AS n_tup_upd , pg_stat_get_tuples_deleted(C.oid) AS n_tup_del , CASE WHEN pg_stat_get_tuples_updated(C.oid) > 0        THEN pg_stat_get_tuples_hot_updated(C.oid)::real           / pg_stat_get_tuples_updated(C.oid)        END   AS HOT_update_ratio , pg_stat_get_live_tuples(C.oid) AS n_live_tup , pg_stat_get_dead_tuples(C.oid) AS n_dead_tup , C.reltuples AS reltuples , round( current_setting('autovacuum_vacuum_threshold')::integer  + current_setting('autovacuum_vacuum_scale_factor')::numeric ...
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Publisher Resources

ISBN: 9781788474924Supplemental Content