Created
December 4, 2023 16:35
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logical_replication_dumpr.rb
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| require 'pg' | |
| require 'timeout' | |
| require 'time' | |
| require 'json' | |
| THE_QUERY = <<SQL | |
| SELECT | |
| sum(table_size) AS table_size, | |
| sum(indexes_size) AS indexes_size, | |
| sum(total_size) AS total_size | |
| FROM ( | |
| SELECT | |
| table_name, | |
| pg_table_size(table_name) AS table_size, | |
| pg_indexes_size(table_name) AS indexes_size, | |
| pg_total_relation_size(table_name) AS total_size | |
| FROM ( | |
| SELECT ('"' || table_schema || '"."' || table_name || '"') AS table_name | |
| FROM information_schema.tables | |
| ) AS all_tables | |
| ORDER BY total_size DESC | |
| ) AS pretty_sizes; | |
| SQL | |
| PROGRESS_QUERY = 'select sr.srsubstate as st, count(*) as c from pg_subscription_rel sr join pg_class cls on (cls.oid = sr.srrelid) group by sr.srsubstate;' | |
| def run_queries(*queries) | |
| conn_url = ENV['CONN_URL'] | |
| conn = nil | |
| error = false | |
| query_results = nil | |
| begin | |
| Timeout.timeout 10 do | |
| conn = PG::Connection.new(conn_url) | |
| end | |
| query_results = queries.map do |query_sql| | |
| conn.query(query_sql).to_a | |
| end | |
| rescue Timeout::Error | |
| error = :timeout | |
| rescue PG::Error, SocketError | |
| error = :pg_or_socket | |
| end | |
| begin | |
| yield(*query_results) if block_given? && !error | |
| rescue StandardError => e | |
| puts "ERROR: #{e}" | |
| end | |
| conn&.close rescue nil | |
| error | |
| end | |
| loop do | |
| time = Time.now | |
| error = run_queries(THE_QUERY, PROGRESS_QUERY) do |res, prg| | |
| data = ["[", Time.now.utc.to_s, "]"] | |
| %w[table_size indexes_size total_size].each do |name| | |
| value = res[0][name] | |
| value_gb = "%.2f" % (res[0][name].to_i / 1073741824.0) | |
| data << "#{name}=#{value} #{name}_gb=#{value_gb}" | |
| end | |
| total = 0 | |
| finished = 0 | |
| prg.each do |row| | |
| total += row['c'].to_i | |
| finished += row['c'].to_i if row['st'] == 'r' | |
| end | |
| data << ("finished=%.2f%%" % [finished / total.to_f * 100.0]) | |
| File.open('./prd-output.txt', 'a') do |fp| | |
| fp.puts(data.join(" ")) | |
| end | |
| puts(data.join(" ")) | |
| end | |
| puts(error) if error != nil | |
| wait = (Time.now.to_f - time.to_f) | |
| sleep(10.0 - wait) if wait < 10.0 | |
| end |
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