code: function Pool(max, options) {
      this.internaldb = []; // connection created by the pool (for destroy)
      this.pooldb = []; // available connection in the pool
      this.dbinuse = 0; // connection currently in use into the pool
      this.max = max || 4;
      this.pending = [];
      this.options = options;
  }
docs: *************************************
  
  Simple Pooling
  
  *************************************