code: public PerfCounter getStatistics(String... procedures)
      {
          PerfCounterMap map = ClientConnectionPool.getStatistics(this);
          PerfCounter result = new PerfCounter(false);
          for(String procedure : procedures)
              result.merge(map.get(procedure));
          return result;
      }
docs: Gets the aggregated performance statistics for a list of procedures on this connection (and all connections with the same parameters).
  
  @param procedures the list of procedures for which to retrieve the statistics.
  @return the counter aggregated across all the connections in the pool with the same parameters as this connection, and across all procedures.