zabbix-mysql表分区

lxy777

　　原文http://lihuipeng.blog.51cto.com/3064864/1561221

　　mysql>>
　　mysql>>　　#1>
　　DELIMITER $$
　　CREATE PROCEDURE `partition_create`(SCHEMANAME varchar(64), TABLENAME varchar(64), PARTITIONNAME varchar(64), CLOCK int)
　　BEGIN
　　/*
　　SCHEMANAME = The DB schema in which to make changes
　　TABLENAME = The table with partitions to potentially delete
　　PARTITIONNAME = The name of the partition to create
　　*/
　　/*
　　Verify that the partition does not already exist
　　*/
　　DECLARE RETROWS INT;
　　SELECT COUNT(1) INTO RETROWS
　　FROM information_schema.partitions
　　WHERE table_schema = SCHEMANAME AND table_name = TABLENAME AND partition_description >= CLOCK;
　　IF RETROWS = 0 THEN
　　/*
　　1. Print a message indicating that a partition was created.
　　2. Create the SQL to create the partition.
　　3. Execute the SQL from #2.
　　*/
　　SELECT CONCAT( "partition_create(", SCHEMANAME, ",", TABLENAME, ",", PARTITIONNAME, ",", CLOCK, ")" ) AS msg;
　　SET @sql = CONCAT( 'ALTER TABLE ', SCHEMANAME, '.', TABLENAME, ' ADD PARTITION (PARTITION ', PARTITIONNAME, ' VALUES LESS THAN (', CLOCK, '));' );
　　PREPARE STMT FROM @sql;
　　EXECUTE STMT;
　　DEALLOCATE PREPARE STMT;
　　END IF;
　　END$$
　　DELIMITER ;
　　#2>
　　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 ;
　　#3>
　　DELIMITER $$
　　CREATE PROCEDURE `partition_maintenance`(SCHEMA_NAME VARCHAR(32), TABLE_NAME VARCHAR(32), KEEP_DATA_DAYS INT, HOURLY_INTERVAL INT, CREATE_NEXT_INTERVALS INT)
　　BEGIN
　　DECLARE OLDER_THAN_PARTITION_DATE VARCHAR(16);
　　DECLARE PARTITION_NAME VARCHAR(16);
　　DECLARE OLD_PARTITION_NAME VARCHAR(16);
　　DECLARE LESS_THAN_TIMESTAMP INT;
　　DECLARE CUR_TIME INT;
　　CALL partition_verify(SCHEMA_NAME, TABLE_NAME, HOURLY_INTERVAL);
　　SET CUR_TIME = UNIX_TIMESTAMP(DATE_FORMAT(NOW(), '%Y-%m-%d 00:00:00'));
　　SET @__interval = 1;
　　create_loop: LOOP
　　IF @__interval > CREATE_NEXT_INTERVALS THEN
　　LEAVE create_loop;
　　END IF;
　　SET LESS_THAN_TIMESTAMP = CUR_TIME + (HOURLY_INTERVAL * @__interval * 3600);
　　SET PARTITION_NAME = FROM_UNIXTIME(CUR_TIME + HOURLY_INTERVAL * (@__interval - 1) * 3600, 'p%Y%m%d%H00');
　　IF(PARTITION_NAME != OLD_PARTITION_NAME) THEN
　　CALL partition_create(SCHEMA_NAME, TABLE_NAME, PARTITION_NAME, LESS_THAN_TIMESTAMP);
　　END IF;
　　SET @__interval=@__interval+1;
　　SET OLD_PARTITION_NAME = PARTITION_NAME;
　　END LOOP;
　　SET OLDER_THAN_PARTITION_DATE=DATE_FORMAT(DATE_SUB(NOW(), INTERVAL KEEP_DATA_DAYS DAY), '%Y%m%d0000');
　　CALL partition_drop(SCHEMA_NAME, TABLE_NAME, OLDER_THAN_PARTITION_DATE);
　　END$$
　　DELIMITER ;
　　#4>
　　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 ;
　　#4>
　　DELIMITER $$
　　CREATE PROCEDURE `partition_maintenance_all`(SCHEMA_NAME VARCHAR(32))
　　BEGIN
　　CALL partition_maintenance(SCHEMA_NAME, 'history', 90, 720, 20);
　　CALL partition_maintenance(SCHEMA_NAME, 'history_log', 90, 720, 20);
　　CALL partition_maintenance(SCHEMA_NAME, 'history_str', 90, 720, 20);
　　CALL partition_maintenance(SCHEMA_NAME, 'history_text', 90, 720, 20);
　　CALL partition_maintenance(SCHEMA_NAME, 'history_uint', 90, 720, 20);
　　CALL partition_maintenance(SCHEMA_NAME, 'trends', 730, 720, 20);
　　CALL partition_maintenance(SCHEMA_NAME, 'trends_uint', 730, 720, 20);
　　END$$
　　DELIMITER ;
　　#5>
　　mysql> CALL partition_maintenance_all('zabbix');