Contents

# frozen_string_literal: true

module RailsPGExtras
  def self.vacuum_stats_description
    "Dead rows and whether an automatic vacuum is expected to be triggered"
  end

  def self.vacuum_stats_sql
    <<-EOS
WITH table_opts AS (
  SELECT
    pg_class.oid, relname, nspname, array_to_string(reloptions, '') AS relopts
  FROM
     pg_class INNER JOIN pg_namespace ns ON relnamespace = ns.oid
), vacuum_settings AS (
  SELECT
    oid, relname, nspname,
    CASE
      WHEN relopts LIKE '%autovacuum_vacuum_threshold%'
        THEN substring(relopts, '.*autovacuum_vacuum_threshold=([0-9.]+).*')::integer
        ELSE current_setting('autovacuum_vacuum_threshold')::integer
      END AS autovacuum_vacuum_threshold,
    CASE
      WHEN relopts LIKE '%autovacuum_vacuum_scale_factor%'
        THEN substring(relopts, '.*autovacuum_vacuum_scale_factor=([0-9.]+).*')::real
        ELSE current_setting('autovacuum_vacuum_scale_factor')::real
      END AS autovacuum_vacuum_scale_factor
  FROM
    table_opts
)
SELECT
  vacuum_settings.nspname AS schema,
  vacuum_settings.relname AS table,
  to_char(psut.last_vacuum, 'YYYY-MM-DD HH24:MI') AS last_vacuum,
  to_char(psut.last_autovacuum, 'YYYY-MM-DD HH24:MI') AS last_autovacuum,
  to_char(pg_class.reltuples, '9G999G999G999') AS rowcount,
  to_char(psut.n_dead_tup, '9G999G999G999') AS dead_rowcount,
  to_char(autovacuum_vacuum_threshold
       + (autovacuum_vacuum_scale_factor::numeric * pg_class.reltuples), '9G999G999G999') AS autovacuum_threshold,
  CASE
    WHEN autovacuum_vacuum_threshold + (autovacuum_vacuum_scale_factor::numeric * pg_class.reltuples) < psut.n_dead_tup
    THEN 'yes'
  END AS expect_autovacuum
FROM
  pg_stat_user_tables psut INNER JOIN pg_class ON psut.relid = pg_class.oid
    INNER JOIN vacuum_settings ON pg_class.oid = vacuum_settings.oid
ORDER BY 1
EOS
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
rails-pg-extras-0.4.1	lib/rails-pg-extras/queries/vacuum_stats.rb
rails-pg-extras-0.4.0	lib/rails-pg-extras/queries/vacuum_stats.rb
rails-pg-extras-0.3.0	lib/rails-pg-extras/queries/vacuum_stats.rb
rails-pg-extras-0.2.0	lib/rails-pg-extras/queries/vacuum_stats.rb