OlinData MySQL Blog

DELIMITER $$

DROP FUNCTION IF EXISTS `temp`.`FNC_GOOGRAPH_DB_SIZE`$$
CREATE DEFINER=`root`@`localhost` FUNCTION `FNC_GOOGRAPH_DB_SIZE`(
  p_chart_type CHAR,
  p_height INT,
  p_width INT) RETURNS varchar(255) CHARSET latin1
  READS SQL DATA
BEGIN
  /* Author:    Walter Heck – OlinData */
  /* Date:      20090216 */
  /* Note:      After an idea by Alex Gorbachev – Pythian */
  /*            http://www.pythian.com/blogs/1490/google-charts-for-dba-tablespaces-allocation */

  /* variable declaration */
  DECLARE v_done BOOLEAN default false;
  DECLARE v_url varchar(255);

  DECLARE v_schema_name varchar(255);
  DECLARE v_data_length_sum int;
  DECLARE v_data_length_total int;
    
  DECLARE v_legend_labels varchar(255);
  DECLARE v_chart_labels varchar(255);
  DECLARE v_chart_data varchar(255);

  /* Cursor declaration */
  DECLARE c_schema_sizes cursor for
      select
        t.table_schema,
        round(sum(t.data_length + t.index_length) / 1024 / 1024) as data_length_schema
      from
        information_schema.tables t
      group by
        t.table_schema
      order by
        t.table_schema;

  /* Handler declaration */
  DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_done = true;

  /* Initialize the variables */
  SET v_legend_labels = ”;
  SET v_chart_labels = ”;
  SET v_chart_data = ”;

  /* Get the total data length + index_length for all tables */
  select
      round(sum(t.data_length + t.index_length) / 1024 / 1024) as data_length_total
  into
      v_data_length_total
  from
      information_schema.tables t;
    
  /* Open the cursor */
  OPEN c_schema_sizes;

  /* Loop through the cursor */
  get_data: LOOP

      /* Fetch the next row of data into our variables */
      FETCH c_schema_sizes INTO v_schema_name, v_data_length_sum;

      /* if there is no more data, v_done will be true */
      IF v_done THEN
        /* Exit the loop */
        LEAVE get_data;
      END IF;

      /* Add the schema name to the labels for the legend */
      IF v_legend_labels = ” THEN
        SET v_legend_labels = v_schema_name;
      ELSE
        SET v_legend_labels = concat(v_legend_labels, ‘|’, v_schema_name);
      END IF;

      /* Add the total size of the schema to the labels */
      IF v_chart_labels = ” THEN
        SET v_chart_labels = v_data_length_sum;
      ELSE
        SET v_chart_labels = concat(v_chart_labels, ‘|’, v_data_length_sum);
      END IF;

      /* Get the percentage of the total size as the graph’s data */
      IF v_chart_data = ” THEN
        SET v_chart_data = ROUND(v_data_length_sum / v_data_length_total, 2) * 100;
      ELSE
        SET v_chart_data = concat(v_chart_data, ‘,’, ROUND(v_data_length_sum / v_data_length_total, 2) * 100);
      END IF;

  END LOOP get_data;

  /* Close the cursor */
  CLOSE c_schema_sizes;
    
  /* Build up the google graph url */
  SET v_url = ‘http://chart.apis.google.com/chart?’;
  SET v_url = CONCAT(v_url, ‘cht=’, p_chart_type);
  SET v_url = CONCAT(v_url, ‘&chs=’, p_width , ‘x’, p_height);
  SET v_url = CONCAT(v_url, ‘&chtt=Database Sizes’);
  SET v_url = CONCAT(v_url, ‘&chl=’, v_chart_labels);
  SET v_url = CONCAT(v_url, ‘&chd=t:’, v_chart_data);
  SET v_url = CONCAT(v_url, ‘&chdl=’, v_legend_labels);

  /* return the url as the function’s result */
  RETURN v_url;
END$$

DELIMITER ;