Module: PgHero::Methods::Space

Included in:
Database
Defined in:
lib/pghero/methods/space.rb

Instance Method Summary collapse

Instance Method Details

#capture_space_stats ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 122

def capture_space_stats
  now = Time.now
  values =
    relation_sizes.map do |rs|
      {
        database: id,
        schema: rs[:schema],
        relation: rs[:relation],
        size: rs[:size_bytes].to_i,
        captured_at: now
      }
    end
  PgHero::SpaceStats.insert_all!(values) if values.any?
end

#clean_space_stats(before: nil) ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 137

def clean_space_stats(before: nil)
  before ||= 90.days.ago
  PgHero::SpaceStats.where(database: id).where("captured_at < ?", before).delete_all
end

#database_size ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 4

def database_size
  PgHero.pretty_size select_one("SELECT pg_database_size(current_database())")
end

#relation_sizes ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 8

def relation_sizes
  select_all_size "    SELECT\n      n.nspname AS schema,\n      c.relname AS relation,\n      CASE c.relkind WHEN 'r' THEN 'table' WHEN 'm' then 'matview' ELSE 'index' END AS type,\n      pg_table_size(c.oid) AS size_bytes\n    FROM\n      pg_class c\n    LEFT JOIN\n      pg_namespace n ON n.oid = c.relnamespace\n    WHERE\n      n.nspname NOT IN ('pg_catalog', 'information_schema')\n      AND n.nspname !~ '^pg_toast'\n      AND c.relkind IN ('r', 'm', 'i')\n    ORDER BY\n      pg_table_size(c.oid) DESC,\n      2 ASC\n  SQL\nend\n"

#relation_space_stats(relation, schema: "public") ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 92

def relation_space_stats(relation, schema: "public")
  if space_stats_enabled?
    relation_sizes ||= self.relation_sizes
    sizes = relation_sizes.map { |r| [[r[:schema], r[:relation]], r[:size_bytes]] }.to_h
    start_at = 30.days.ago

    stats = select_all_stats "      SELECT\n        captured_at,\n        size AS size_bytes\n      FROM\n        pghero_space_stats\n      WHERE\n        database = \#{quote(id)}\n        AND captured_at >= \#{quote(start_at)}\n        AND schema = \#{quote(schema)}\n        AND relation = \#{quote(relation)}\n      ORDER BY\n        1 ASC\n    SQL\n\n    stats << {\n      captured_at: Time.now,\n      size_bytes: sizes[[schema, relation]].to_i\n    }\n  else\n    raise NotEnabled, \"Space stats not enabled\"\n  end\nend\n"

#space_growth(days: 7, relation_sizes: nil) ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 49

def space_growth(days: 7, relation_sizes: nil)
  if space_stats_enabled?
    relation_sizes ||= self.relation_sizes
    sizes = relation_sizes.to_h { |r| [[r[:schema], r[:relation]], r[:size_bytes]] }
    start_at = days.days.ago

    stats = select_all_stats "      WITH t AS (\n        SELECT\n          schema,\n          relation,\n          array_agg(size ORDER BY captured_at) AS sizes\n        FROM\n          pghero_space_stats\n        WHERE\n          database = \#{quote(id)}\n          AND captured_at >= \#{quote(start_at)}\n        GROUP BY\n          1, 2\n      )\n      SELECT\n        schema,\n        relation,\n        sizes[1] AS size_bytes\n      FROM\n        t\n      ORDER BY\n        1, 2\n    SQL\n\n    stats.each do |r|\n      relation = [r[:schema], r[:relation]]\n      if sizes[relation]\n        r[:growth_bytes] = sizes[relation] - r[:size_bytes]\n      end\n      r.delete(:size_bytes)\n    end\n    stats\n  else\n    raise NotEnabled, \"Space stats not enabled\"\n  end\nend\n"

#space_stats_enabled? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pghero/methods/space.rb', line 142

def space_stats_enabled?
  table_exists?("pghero_space_stats")
end

#table_sizes ⇒ Object 



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# File 'lib/pghero/methods/space.rb', line 29

def table_sizes
  select_all_size "    SELECT\n      n.nspname AS schema,\n      c.relname AS table,\n      pg_total_relation_size(c.oid) AS size_bytes\n    FROM\n      pg_class c\n    LEFT JOIN\n      pg_namespace n ON n.oid = c.relnamespace\n    WHERE\n      n.nspname NOT IN ('pg_catalog', 'information_schema')\n      AND n.nspname !~ '^pg_toast'\n      AND c.relkind = 'r'\n    ORDER BY\n      pg_total_relation_size(c.oid) DESC,\n      2 ASC\n  SQL\nend\n"