Class: PostgreStats

Inherits:
Object
  • Object
show all
Defined in:
lib/postgrestats.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, logger = nil) ⇒ PostgreStats

Returns a new instance of PostgreStats.



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# File 'lib/postgrestats.rb', line 9

def initialize(config, logger = nil)
  @config = config
  
  initialize_log unless logger
  @log = logger if logger
  @log.error("Logging started")
  
  initialize_metrics
end

Instance Attribute Details

#aggregate_counters ⇒ Object

Returns the value of attribute aggregate_counters.



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# File 'lib/postgrestats.rb', line 7

def aggregate_counters
  @aggregate_counters
end

#aggregate_gauges ⇒ Object

Returns the value of attribute aggregate_gauges.



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# File 'lib/postgrestats.rb', line 7

def aggregate_gauges
  @aggregate_gauges
end

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/postgrestats.rb', line 6

def config
  @config
end

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/postgrestats.rb', line 6

def connection
  @connection
end

#db ⇒ Object

Returns the value of attribute db.



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# File 'lib/postgrestats.rb', line 6

def db
  @db
end

#log ⇒ Object

Returns the value of attribute log.



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# File 'lib/postgrestats.rb', line 6

def log
  @log
end

#table_counters ⇒ Object

Returns the value of attribute table_counters.



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# File 'lib/postgrestats.rb', line 7

def table_counters
  @table_counters
end

#table_gauges ⇒ Object

Returns the value of attribute table_gauges.



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# File 'lib/postgrestats.rb', line 7

def table_gauges
  @table_gauges
end

Instance Method Details

#connect(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 182

def connect(db)
  return if connection and (@db == db)
  
  connection.close if @db == db
  
  tmp_config ={
    'host' => @config['host'],
    'user' => @config['user'],
    'password' => @config['password'],
    'dbname' => db
  }
  
  @connection = PG.connect(tmp_config)
  @db = db
end

#get_aggregate_ganglia_double ⇒ Object 



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# File 'lib/postgrestats.rb', line 229

def get_aggregate_ganglia_double()
  return [
    aggregate_gauges.select{ |k, v| v.has_key?('ganglia_double') }.keys,
    aggregate_counters.select{ |k, v| v.has_key?('ganglia_double') }.keys
  ].flatten
end

#get_aggregate_metrics ⇒ Object 



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# File 'lib/postgrestats.rb', line 218

def get_aggregate_metrics()
  return [aggregate_gauges.keys, aggregate_counters.keys].flatten
end

#get_blocks_fetched_per_database(db) ⇒ Object

  • number of blocks fetched per database



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# File 'lib/postgrestats.rb', line 392

def get_blocks_fetched_per_database(db)
  query = <<-END_GET_BLOCKS_FETCHED_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_blocks_fetched(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_BLOCKS_FETCHED_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_blocks_fetched'].to_i
end

#get_blocks_hit_per_database(db) ⇒ Object

  • number of blocks hit per database



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# File 'lib/postgrestats.rb', line 406

def get_blocks_hit_per_database(db)
  query = <<-END_GET_BLOCK_HITS_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_blocks_hit(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_BLOCK_HITS_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_blocks_hit'].to_i
end

#get_commits_per_database(db) ⇒ Object

  • number of commits per database



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# File 'lib/postgrestats.rb', line 420

def get_commits_per_database(db)
  query = <<-END_GET_COMMITS_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_xact_commit(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_COMMITS_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_xact_commit'].to_i
end

#get_connections_per_database(db = nil) ⇒ Object

  • number of connections



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# File 'lib/postgrestats.rb', line 346

def get_connections_per_database(db = nil)
  query = <<-END_GET_CONNECTIONS_PER_DATABASE_QUERY
    SELECT datname, count(*) FROM pg_stat_activity GROUP BY datname;
  END_GET_CONNECTIONS_PER_DATABASE_QUERY
  
  ret = run_query('postgres', query)
  
  ret.select!{ |v| not @config['exclude_dbs'].include?(v['datname']) }.map!{ |v| [v['datname'], v['count'].to_i] }
  
  if db
    res = Hash[*ret.flatten][db].to_i || 0
  else
    res = Hash[*ret.flatten]
  end
  
  return res
end

#get_databases ⇒ Object 



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# File 'lib/postgrestats.rb', line 236

def get_databases()
  query = <<-END_GET_DATABASES_QUERY
    SELECT pg_database.datname AS "Database", pg_user.usename AS "Owner"
    FROM pg_database, pg_user
    WHERE pg_database.datdba = pg_user.usesysid
    UNION
    SELECT pg_database.datname AS "Database", NULL AS "Owner"
    FROM pg_database
    WHERE pg_database.datdba NOT IN (SELECT usesysid FROM pg_user)
    ORDER BY "Database"
  END_GET_DATABASES_QUERY
  
  ret = run_query('postgres', query)
  
  ret.select!{ |v| not @config['exclude_dbs'].include?(v['Database']) }.map!{ |v| v['Database'] }
  
  return ret
end

#get_dead_per_table(db) ⇒ Object

  • number of dead rows per table



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# File 'lib/postgrestats.rb', line 620

def get_dead_per_table(db)
  query = <<-END_GET_DEAD_PER_TABLE_QUERY
    SELECT c.relname, pg_stat_get_dead_tuples(c.oid) FROM pg_catalog.pg_class c
    LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
    WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
    AND pg_catalog.pg_table_is_visible(c.oid)
  END_GET_DEAD_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['pg_stat_get_dead_tuples'].to_i] }

  return Hash[*ret.flatten]
end

#get_deletes_per_database(db) ⇒ Object

  • number of rows deleted per database



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# File 'lib/postgrestats.rb', line 479

def get_deletes_per_database(db)
  query = <<-END_GET_DELETES_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_tuples_deleted(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_DELETES_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_tuples_deleted'].to_i
end

#get_deletes_per_table(db) ⇒ Object

  • number of deleted rows per table



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# File 'lib/postgrestats.rb', line 603

def get_deletes_per_table(db)
   query = <<-END_GET_DELETES_PER_TABLE_QUERY
     SELECT c.relname, pg_stat_get_tuples_deleted(c.oid) FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
     AND pg_catalog.pg_table_is_visible(c.oid)
   END_GET_DELETES_PER_TABLE_QUERY

   ret = run_query(db, query)

   ret.map!{ |v| [v['relname'], v['pg_stat_get_tuples_deleted'].to_i] }

   return Hash[*ret.flatten]
end

#get_fetched_per_table(db) ⇒ Object

  • number of fetched rows per table



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# File 'lib/postgrestats.rb', line 537

def get_fetched_per_table(db)
   query = <<-END_GET_FETCHED_PER_TABLE_QUERY
     SELECT c.relname, pg_stat_get_tuples_fetched(c.oid) FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
     AND pg_catalog.pg_table_is_visible(c.oid)
   END_GET_FETCHED_PER_TABLE_QUERY

   ret = run_query(db, query)

   ret.map!{ |v| [v['relname'], v['pg_stat_get_tuples_fetched'].to_i] }

   return Hash[*ret.flatten]
end

#get_heap_blocks_hit_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 705

def get_heap_blocks_hit_per_table(db)
  query = <<-END_GET_HEAP_BLOCKS_HIT_PER_TABLE_QUERY
    SELECT stat.relname AS relname, heap_blks_hit
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_HEAP_BLOCKS_HIT_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['heap_blks_hit'].to_i] }

  return Hash[*ret.flatten]
end

#get_heap_blocks_read_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 691

def get_heap_blocks_read_per_table(db)
  query = <<-END_GET_HEAP_BLOCKS_READ_PER_TABLE_QUERY
    SELECT stat.relname AS relname, heap_blks_read
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_HEAP_BLOCKS_READ_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['heap_blks_read'].to_i] }

  return Hash[*ret.flatten]
end

#get_hot_updates_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 586

def get_hot_updates_per_table(db)
   query = <<-END_GET_HOT_UPDATES_PER_TABLE_QUERY
     SELECT c.relname, pg_stat_get_tuples_hot_updated(c.oid) FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
     AND pg_catalog.pg_table_is_visible(c.oid)
   END_GET_HOT_UPDATES_PER_TABLE_QUERY

   ret = run_query(db, query)

   ret.map!{ |v| [v['relname'], v['pg_stat_get_tuples_hot_updated'].to_i] }

   return Hash[*ret.flatten]
end

#get_index_blocks_hit_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 733

def get_index_blocks_hit_per_table(db)
  query = <<-END_GET_INDEX_BLOCKS_HIT_PER_TABLE_QUERY
    SELECT stat.relname AS relname, idx_blks_hit
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_INDEX_BLOCKS_HIT_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['idx_blks_hit'].to_i] }

  return Hash[*ret.flatten]
end

#get_index_blocks_read_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 719

def get_index_blocks_read_per_table(db)
  query = <<-END_GET_INDEX_BLOCKS_READ_PER_TABLE_QUERY
    SELECT stat.relname AS relname, idx_blks_read
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_INDEX_BLOCKS_READ_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['idx_blks_read'].to_i] }

  return Hash[*ret.flatten]
end

#get_index_rows_fetched_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 677

def get_index_rows_fetched_per_table(db)
  query = <<-END_GET_INDEX_ROWS_FETCHED_PER_TABLE_QUERY
    SELECT stat.relname AS relname, idx_tup_fetch
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_INDEX_ROWS_FETCHED_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['idx_tup_fetch'].to_i] }

  return Hash[*ret.flatten]
end

#get_index_scans_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 663

def get_index_scans_per_table(db)
  query = <<-END_GET_INDEX_SCANS_PER_TABLE_QUERY
    SELECT stat.relname AS relname, idx_scan
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_INDEX_SCANS_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['idx_scan'].to_i] }

  return Hash[*ret.flatten]
end

#get_index_sizes(db) ⇒ Object

  • size of indexes



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# File 'lib/postgrestats.rb', line 286

def get_index_sizes(db)
  query = <<-END_GET_INDEX_SIZES_QUERY
    SELECT table_name,(pg_total_relation_size(table_name) - pg_relation_size(table_name)) AS size
    FROM information_schema.tables
    WHERE table_schema NOT IN ('information_schema', 'pg_catalog') AND table_type = 'BASE TABLE'
  END_GET_INDEX_SIZES_QUERY
  
  ret = run_query(db, query)
  
  ret.map!{ |v| [v['table_name'], v['size'].to_i] }
  
  return Hash[*ret.flatten]
end

#get_inserts_per_database(db) ⇒ Object

  • number of disk block reads per database

  • number of buffer hits per database

  • number of rows returned per database

  • number of rows inserted per database



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# File 'lib/postgrestats.rb', line 451

def get_inserts_per_database(db)
  query = <<-END_GET_INSERTS_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_tuples_inserted(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_INSERTS_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_tuples_inserted'].to_i
end

#get_inserts_per_table(db) ⇒ Object

  • number of inserted rows per table



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# File 'lib/postgrestats.rb', line 554

def get_inserts_per_table(db)
   query = <<-END_GET_INSERTS_PER_TABLE_QUERY
     SELECT c.relname, pg_stat_get_tuples_inserted(c.oid) FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
     AND pg_catalog.pg_table_is_visible(c.oid)
   END_GET_INSERTS_PER_TABLE_QUERY

   ret = run_query(db, query)

   ret.map!{ |v| [v['relname'], v['pg_stat_get_tuples_inserted'].to_i] }

   return Hash[*ret.flatten]
end

#get_last_autovacuum_per_table(db) ⇒ Object

  • dead unused space taken up in a table or index

  • number of seconds since the last checkpoint per database

  • number of seconds since the last autovacuum per database/table



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# File 'lib/postgrestats.rb', line 368

def get_last_autovacuum_per_table(db)
  query = <<-END_GET_LAST_AUTOVACUUM_PER_DATABASE_QUERY
    SELECT current_database() AS datname, nspname AS sname, relname AS tname,
      CASE WHEN v IS NULL THEN -1 ELSE round(extract(epoch FROM now()-v)) END AS ltime
    FROM (
      SELECT nspname, relname, pg_stat_get_last_autovacuum_time(c.oid) AS v
      FROM pg_class c, pg_namespace n
      WHERE relkind = 'r'
      AND n.oid = c.relnamespace
      AND n.nspname <> 'information_schema'
      AND n.nspname = 'public'
      ORDER BY 3
     ) AS foo
  END_GET_LAST_AUTOVACUUM_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  ret.map!{ |v| [v['tname'], v['ltime']] }
  
  return Hash[*ret.flatten]
end

#get_locks_per_database(db) ⇒ Object

  • list of locks



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# File 'lib/postgrestats.rb', line 496

def get_locks_per_database(db)
  query = <<-END_GET_LOCKS_PER_DATABASE_QUERY
    SELECT pid, virtualxid, datname, relname, locktype, mode
    FROM pg_locks l 
    LEFT JOIN pg_database d ON (d.oid=l.database)
    LEFT JOIN pg_class c on (c.oid=l.relation)
    WHERE datname = '#{db}' AND NOT relname ~ 'pg_'
  END_GET_LOCKS_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret
end

#get_number_of_locks_per_database(db) ⇒ Object

  • number of locks



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# File 'lib/postgrestats.rb', line 511

def get_number_of_locks_per_database(db)
  return get_locks_per_database(db).size
end

#get_returned_per_table(db) ⇒ Object

  • number of returned rows per table



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# File 'lib/postgrestats.rb', line 520

def get_returned_per_table(db)
   query = <<-END_GET_RETURNED_PER_TABLE_QUERY
     SELECT c.relname, pg_stat_get_tuples_returned(c.oid) FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
     AND pg_catalog.pg_table_is_visible(c.oid)
   END_GET_RETURNED_PER_TABLE_QUERY

   ret = run_query(db, query)

   ret.map!{ |v| [v['relname'], v['pg_stat_get_tuples_returned'].to_i] }

   return Hash[*ret.flatten]
end

#get_rollbacks_per_database(db) ⇒ Object

  • number of rollbacks per database



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# File 'lib/postgrestats.rb', line 434

def get_rollbacks_per_database(db)
  query = <<-END_GET_ROLLBACKS_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_xact_rollback(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_ROLLBACKS_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_xact_rollback'].to_i
end

#get_sequential_rows_read_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 649

def get_sequential_rows_read_per_table(db)
  query = <<-END_GET_SEQ_ROWS_READ_PER_TABLE_QUERY
    SELECT stat.relname AS relname, seq_tup_read
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_SEQ_ROWS_READ_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['seq_tup_read'].to_i] }

  return Hash[*ret.flatten]
end

#get_sequential_scans_per_table(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 635

def get_sequential_scans_per_table(db)
  query = <<-END_GET_SEQ_SCANS_PER_TABLE_QUERY
    SELECT stat.relname AS relname, seq_scan
    FROM pg_stat_user_tables stat
    RIGHT JOIN pg_statio_user_tables statio ON stat.relid=statio.relid;
  END_GET_SEQ_SCANS_PER_TABLE_QUERY

  ret = run_query(db, query)

  ret.map!{ |v| [v['relname'], v['seq_scan'].to_i] }

  return Hash[*ret.flatten]
end

#get_table_estimated_rows(db, table) ⇒ Object

  • estimated rows per database/table



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# File 'lib/postgrestats.rb', line 317

def get_table_estimated_rows(db, table)
  query = <<-END_GET_TABLE_ESTIMATED_ROWS_QUERY
    SELECT (
      CASE 
      WHEN reltuples > 0 THEN pg_relation_size('#{table}')/(8192*relpages::bigint/reltuples)
      ELSE 0
      END
    )::bigint AS estimated_row_count
    FROM pg_class
    WHERE oid = '#{table}'::regclass;
  END_GET_TABLE_ESTIMATED_ROWS_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['estimated_row_count'].to_i
end

#get_table_ganglia_double ⇒ Object 



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# File 'lib/postgrestats.rb', line 222

def get_table_ganglia_double()
  return [
    table_gauges.select{ |k, v| v.has_key?('ganglia_double') }.keys,
    table_counters.select{ |k, v| v.has_key?('ganglia_double') }.keys
  ].flatten
end

#get_table_metrics ⇒ Object 



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# File 'lib/postgrestats.rb', line 214

def get_table_metrics()
  return [table_gauges.keys, table_counters.keys].flatten
end

#get_table_sizes(db) ⇒ Object

  • size per database/table



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# File 'lib/postgrestats.rb', line 271

def get_table_sizes(db)
  query = <<-END_GET_TABLE_SIZES_QUERY
    SELECT table_name,pg_relation_size(table_name) AS size
    FROM information_schema.tables
    WHERE table_schema NOT IN ('information_schema', 'pg_catalog') AND table_type = 'BASE TABLE'
  END_GET_TABLE_SIZES_QUERY
  
  ret = run_query(db, query)
  
  ret.map!{ |v| [v['table_name'], v['size'].to_i] }
  
  return Hash[*ret.flatten]
end

#get_tables(db) ⇒ Object 



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# File 'lib/postgrestats.rb', line 255

def get_tables(db)
  query = <<-END_GET_TABLES_QUERY
    SELECT c.relname FROM pg_catalog.pg_class c
    LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
    WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
    AND pg_catalog.pg_table_is_visible(c.oid)
  END_GET_TABLES_QUERY
  
  ret = run_query(db, query)
  
  ret.map!{ |v| v['relname'] }
  
  return ret
end

#get_tables_estimated_rows(db) ⇒ Object

  • estimated rows for every table in the database



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# File 'lib/postgrestats.rb', line 335

def get_tables_estimated_rows(db)
  ret = {}
  
  get_tables(db).each do |table|
     ret[table] = get_table_estimated_rows(db, table)
  end
  
  return ret
end

#get_updates_per_database(db) ⇒ Object

  • number of rows updates per database



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# File 'lib/postgrestats.rb', line 465

def get_updates_per_database(db)
  query = <<-END_GET_UPDATES_PER_DATABASE_QUERY
    SELECT pg_stat_get_db_tuples_updated(oid)
    FROM pg_database
    WHERE datname = '#{db}'
  END_GET_UPDATES_PER_DATABASE_QUERY
  
  ret = run_query(db, query)
  
  return ret.first['pg_stat_get_db_tuples_updated'].to_i
end

#get_updates_per_table(db) ⇒ Object

  • number of updates rows per table



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# File 'lib/postgrestats.rb', line 571

def get_updates_per_table(db)
   query = <<-END_GET_UPDATES_PER_TABLE_QUERY
     SELECT c.relname, pg_stat_get_tuples_updated(c.oid) FROM pg_catalog.pg_class c
     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
     WHERE c.relkind IN ('r','') AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
     AND pg_catalog.pg_table_is_visible(c.oid)
   END_GET_UPDATES_PER_TABLE_QUERY

   ret = run_query(db, query)

   ret.map!{ |v| [v['relname'], v['pg_stat_get_tuples_updated'].to_i] }

   return Hash[*ret.flatten]
end

#initialize_log ⇒ Object 



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# File 'lib/postgrestats.rb', line 19

def initialize_log
  @config['log'] = {
    'file' => STDOUT,
    'level' => 'INFO'
  }.merge(@config['log'] || {})
  
  log_initialize = [@config['log']['file']]
  log_initialize << @config['log']['shift_age'] if @config['log']['shift_age']
  log_initialize << @config['log']['shift_size'] if @config['log']['shift_size']
  
  begin
    @log = Logger.new(*log_initialize)
    @log.level = Logger.const_get(@config['log']['level'])
  rescue Exception => e
    @config['log'] = {
      'file' => STDOUT,
      'level' => 'INFO'
    }
    @log = Logger.new(@config['log']['file'])
    @log.level = Logger.const_get(@config['log']['level'])
    @log.error("Caught a problem with log settings")
    @log.error("#{e.message}")
    @log.error("Setting log settings to defaults")
  end
end

#initialize_metrics ⇒ Object 



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# File 'lib/postgrestats.rb', line 45

def initialize_metrics
  @table_gauges = {
    'table_size' => {
      'units' => 'bytes',
      'handler' => :get_table_sizes
    },
    'index_size' => {
      'units' => 'bytes',
      'handler' => :get_index_sizes
    },
    'estimated_rows' => {
      'units' => 'rows',
      'handler' => :get_tables_estimated_rows
    },
    'dead' => {
      'units' => 'rows',
      'handler' => :get_dead_per_table
    }, 
    'last_vacuum' => {
      'units' => 'seconds since',
      'handler' => :get_last_autovacuum_per_table
    }
  }
  
  @table_counters = {
    'inserts' => {
      'units' => 'inserts/s',
      'ganglia_double' => true,
      'handler' => :get_inserts_per_table
    }, 
    'updates' => {
      'units' => 'updates/s',
      'ganglia_double' => true,
      'handler' => :get_updates_per_table
    },
    'deletes' => {
      'units' => 'deletes/s',
      'ganglia_double' => true,
      'handler' => :get_deletes_per_table
    },
    'hot_updates' => {
      'units' => 'updates/s',
      'ganglia_double' => true,
      'handler' => :get_hot_updates_per_table
    },
    'seq_scan' => {
      'units' => 'scans/s',
      'ganglia_double' => true,
      'handler' => :get_sequential_scans_per_table
    },
    'idx_scan' => {
      'units' => 'scans/s',
      'ganglia_double' => true,
      'handler' => :get_index_scans_per_table
    },
    'seq_tup_read' => {
      'units' => 'rows/s',
      'ganglia_double' => true,
      'handler' => :get_sequential_rows_read_per_table
    },
    'idx_tup_fetch' => {
      'units' => 'rows/s',
      'ganglia_double' => true,
      'handler' => :get_index_rows_fetched_per_table
    },
    'heap_blks_read' => {
      'units' => 'blocks/s',
      'ganglia_double' => true,
      'handler' => :get_heap_blocks_read_per_table
    },
    'heap_blks_hit' => {
      'units' => 'blocks/s',
      'ganglia_double' => true,
      'handler' => :get_heap_blocks_hit_per_table
    },
    'idx_blks_read' => {
      'units' => 'blocks/s',
      'ganglia_double' => true,
      'handler' => :get_index_blocks_read_per_table
    },
    'idx_blks_hit' => {
      'units' => 'blocks/s',
      'ganglia_double' => true,
      'handler' => :get_index_blocks_hit_per_table
    }
  }
  
  @aggregate_gauges = {
    'locks' => {
      'units' => 'locks',
      'handler' => :get_number_of_locks_per_database
    },
    'connections' => {
      'units' => 'connections',
      'handler' => :get_connections_per_database
    }
  }
  
  @aggregate_counters = {
    'blocks_fetched' => {
      'units' => 'blocks/s',
      'ganglia_double' => true,
      'handler' => :get_blocks_fetched_per_database
    },
    'blocks_hit' => {
      'units' => 'blocks/s',
      'ganglia_double' => true,
      'handler' => :get_blocks_hit_per_database
    },
    'commits' => {
      'units' => 'commits/s',
      'ganglia_double' => true,
      'handler' => :get_commits_per_database
    },
    'rollbacks' => {
      'units' => 'rollbacks/s',
      'ganglia_double' => true,
      'handler' => :get_rollbacks_per_database
    },
    'inserts' => {
      'units' => 'inserts/s',
      'ganglia_double' => true,
      'handler' => :get_inserts_per_database
    },
    'updates' => {
      'units' => 'updates/s',
      'ganglia_double' => true,
      'handler' => :get_updates_per_database
    },
    'deletes' => {
      'units' => 'deletes/s',
      'ganglia_double' => true,
      'handler' => :get_deletes_per_database
    }
  }
end

#run_query(db, query) ⇒ Object 



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# File 'lib/postgrestats.rb', line 198

def run_query(db, query)
  connect(db)
  
  result = @connection.exec(query)
  fields = result.fields
  ret = []
  
  result.each do |row|
    item = {}
    fields.each { |field| item[field] = row[field] }
    ret << item
  end
  
  return ret
end