text: Alter table history_text drop primary key, add index (id), drop index history_text_2, add index history_text_2 (itemid, id);
  
  Alter table history_log drop primary key, add index (id), drop index history_log_2, add index history_log_2 (itemid, id);
  
  
  DELIMITER $$
  CREATE PROCEDURE `partition_create`(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), PARTITIONNAME VARCHAR(64), CLOCK INT)
  BEGIN
          /*
             SCHEMANAME = The DB schema in which to make changes
             TABLENAME = The table with partitions to potentially delete
             PARTITIONNAME = The name of the partition to create
          */
          /*
             Verify that the partition does not already exist
          */
   
          DECLARE RETROWS INT;
          SELECT COUNT(1) INTO RETROWS
          FROM information_schema.partitions
          WHERE table_schema = SCHEMANAME AND TABLE_NAME = TABLENAME AND partition_name = PARTITIONNAME;
   
          IF RETROWS = 0 THEN
                  /*
                     1. Print a message indicating that a partition was created.
                     2. Create the SQL to create the partition.
                     3. Execute the SQL from #2.
                  */
                  SELECT CONCAT( "partition_create(", SCHEMANAME, ",", TABLENAME, ",", PARTITIONNAME, ",", CLOCK, ")" ) AS msg;
                  SET @SQL = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' ADD PARTITION (PARTITION ', PARTITIONNAME, ' VALUES LESS THAN (', CLOCK, '));' );
                  PREPARE STMT FROM @SQL;
                  EXECUTE STMT;
                  DEALLOCATE PREPARE STMT;
          END IF;
  END$$
  DELIMITER ;
  
  DELIMITER $$
  CREATE PROCEDURE `partition_drop`(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), DELETE_BELOW_PARTITION_DATE BIGINT)
  BEGIN
          /*
             SCHEMANAME = The DB schema in which to make changes
             TABLENAME = The table with partitions to potentially delete
             DELETE_BELOW_PARTITION_DATE = Delete any partitions with names that are dates older than this one (yyyy-mm-dd)
          */
          DECLARE done INT DEFAULT FALSE;
          DECLARE drop_part_name VARCHAR(16);
   
          /*
             Get a list of all the partitions that are older than the date
             in DELETE_BELOW_PARTITION_DATE.  All partitions are prefixed with
             a "p", so use SUBSTRING TO get rid of that character.
          */
          DECLARE myCursor CURSOR FOR
                  SELECT partition_name
                  FROM information_schema.partitions
                  WHERE table_schema = SCHEMANAME AND TABLE_NAME = TABLENAME AND CAST(SUBSTRING(partition_name FROM 2) AS UNSIGNED) < DELETE_BELOW_PARTITION_DATE;
          DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
   
          /*
             Create the basics for when we need to drop the partition.  Also, create
             @drop_partitions to hold a comma-delimited list of all partitions that
             should be deleted.
          */
          SET @alter_header = CONCAT("ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " DROP PARTITION ");
          SET @drop_partitions = "";
   
          /*
             Start looping through all the partitions that are too old.
          */
          OPEN myCursor;
          read_loop: LOOP
                  FETCH myCursor INTO drop_part_name;
                  IF done THEN
                          LEAVE read_loop;
                  END IF;
                  SET @drop_partitions = IF(@drop_partitions = "", drop_part_name, CONCAT(@drop_partitions, ",", drop_part_name));
          END LOOP;
          IF @drop_partitions != "" THEN
                  /*
                     1. Build the SQL to drop all the necessary partitions.
                     2. Run the SQL to drop the partitions.
                     3. Print out the table partitions that were deleted.
                  */
                  SET @full_sql = CONCAT(@alter_header, @drop_partitions, ";");
                  PREPARE STMT FROM @full_sql;
                  EXECUTE STMT;
                  DEALLOCATE PREPARE STMT;
   
                  SELECT CONCAT(SCHEMANAME, ".", TABLENAME) AS `table`, @drop_partitions AS `partitions_deleted`;
          ELSE
                  /*
                     No partitions are being deleted, so print out "N/A" (Not applicable) to indicate
                     that no changes were made.
                  */
                  SELECT CONCAT(SCHEMANAME, ".", TABLENAME) AS `table`, "N/A" AS `partitions_deleted`;
          END IF;
  END$$
  DELIMITER ;
  
  DELIMITER $$
  CREATE PROCEDURE `partition_maintenance`(SCHEMA_NAME VARCHAR(32), TABLE_NAME VARCHAR(32), KEEP_DATA_DAYS INT, HOURLY_INTERVAL INT, CREATE_NEXT_INTERVALS INT)
  BEGIN
          DECLARE OLDER_THAN_PARTITION_DATE VARCHAR(16);
          DECLARE PARTITION_NAME VARCHAR(16);
          DECLARE LESS_THAN_TIMESTAMP INT;
          DECLARE CUR_TIME INT;
   
          CALL partition_verify(SCHEMA_NAME, TABLE_NAME, HOURLY_INTERVAL);
          SET CUR_TIME = UNIX_TIMESTAMP(DATE_FORMAT(NOW(), '%Y-%m-%d 00:00:00'));
          IF DATE(NOW()) = '2014-04-01' THEN
                  SET CUR_TIME = UNIX_TIMESTAMP(DATE_FORMAT(DATE_ADD(NOW(), INTERVAL 1 DAY), '%Y-%m-%d 00:00:00'));
          END IF;
          SET @__interval = 1;
          create_loop: LOOP
                  IF @__interval > CREATE_NEXT_INTERVALS THEN
                          LEAVE create_loop;
                  END IF;
   
                  SET LESS_THAN_TIMESTAMP = CUR_TIME + (HOURLY_INTERVAL * @__interval * 3600);
                  SET PARTITION_NAME = FROM_UNIXTIME(CUR_TIME + HOURLY_INTERVAL * (@__interval - 1) * 3600, 'p%Y%m%d%H00');
                  CALL partition_create(SCHEMA_NAME, TABLE_NAME, PARTITION_NAME, LESS_THAN_TIMESTAMP);
                  SET @__interval=@__interval+1;
          END LOOP;
   
          SET OLDER_THAN_PARTITION_DATE=DATE_FORMAT(DATE_SUB(NOW(), INTERVAL KEEP_DATA_DAYS DAY), '%Y%m%d0000');
          CALL partition_drop(SCHEMA_NAME, TABLE_NAME, OLDER_THAN_PARTITION_DATE);
   
  END$$
  DELIMITER ;
  
  DELIMITER $$
  CREATE PROCEDURE `partition_verify`(SCHEMANAME VARCHAR(64), TABLENAME VARCHAR(64), HOURLYINTERVAL INT(11))
  BEGIN
          DECLARE PARTITION_NAME VARCHAR(16);
          DECLARE RETROWS INT(11);
          DECLARE FUTURE_TIMESTAMP TIMESTAMP;
   
          /*
           * Check if any partitions exist for the given SCHEMANAME.TABLENAME.
           */
          SELECT COUNT(1) INTO RETROWS
          FROM information_schema.partitions
          WHERE table_schema = SCHEMANAME AND TABLE_NAME = TABLENAME AND partition_name IS NULL;
   
          /*
           * If partitions do not exist, go ahead and partition the table
           */
          IF RETROWS = 1 THEN
                  /*
                   * Take the current date at 00:00:00 and add HOURLYINTERVAL to it.  This is the timestamp below which we will store values.
                   * We begin partitioning based on the beginning of a day.  This is because we don't want to generate a random partition
                   * that won't necessarily fall in line with the desired partition naming (ie: if the hour interval is 24 hours, we could
                   * end up creating a partition now named "p201403270600" when all other partitions will be like "p201403280000").
                   */
                  SET FUTURE_TIMESTAMP = TIMESTAMPADD(HOUR, HOURLYINTERVAL, CONCAT(CURDATE(), " ", '00:00:00'));
                  SET PARTITION_NAME = DATE_FORMAT(CURDATE(), 'p%Y%m%d%H00');
   
                  -- Create the partitioning query
                  SET @__PARTITION_SQL = CONCAT("ALTER TABLE ", SCHEMANAME, ".", TABLENAME, " PARTITION BY RANGE(`clock`)");
                  SET @__PARTITION_SQL = CONCAT(@__PARTITION_SQL, "(PARTITION ", PARTITION_NAME, " VALUES LESS THAN (", UNIX_TIMESTAMP(FUTURE_TIMESTAMP), "));");
   
                  -- Run the partitioning query
                  PREPARE STMT FROM @__PARTITION_SQL;
                  EXECUTE STMT;
                  DEALLOCATE PREPARE STMT;
          END IF;
  END$$
  DELIMITER ;
  
  DELIMITER $$
  CREATE PROCEDURE `partition_maintenance_all`(SCHEMA_NAME VARCHAR(32))
  BEGIN
                  CALL partition_maintenance(SCHEMA_NAME, 'history', 90, 24, 14);
                  CALL partition_maintenance(SCHEMA_NAME, 'history_log', 90, 24, 14);
                  CALL partition_maintenance(SCHEMA_NAME, 'history_str', 90, 24, 14);
                  CALL partition_maintenance(SCHEMA_NAME, 'history_text', 90, 24, 14);
                  CALL partition_maintenance(SCHEMA_NAME, 'history_uint', 90, 24, 14);
                  CALL partition_maintenance(SCHEMA_NAME, 'trends', 730, 24, 14);
                  CALL partition_maintenance(SCHEMA_NAME, 'trends_uint', 730, 24, 14);
  END$$
  DELIMITER ;
  
  
  CREATE EVENT zabbixdbmaint
       ON SCHEDULE EVERY 1 DAY
       COMMENT 'zabbix db maintenance'
       DO
         CALL partition_maintenance_all('zabbix');
         
         
  