zabbix之”表分区”

系统监控 jikk345 1295℃ 0评论

本文主要介绍了zabbix进行数据库表分区的方法:

在系统监控中,zabbix已经代替了nagios+cacti,zabbix以其良好的图形展示和高度自定义赢得了很多运维人员的喜爱。但是由于在工作中,zabbix跑的时间过长(我们公司跑了将近3年),web页面经常卡顿,监控数据有时很难插入数据库,且数据库队列经常性卡死,经过查看,发现mysql的数据量高达83G,急需瘦身,于是有了此文。

步骤:

修改表结构:

use zabbix;
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)

创建四大存储过程:

分区创建的存储过程:

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 ;

分区删除的存储过程:

tition_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 ;

分区维护的存储过程:

  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 ;

分区校验的存储过程:

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 ;

存储过程的使用:

存储过程如果单独使用:CALL partition_maintenance(zabbix, ‘history_uint’, 31, 24, 14);

解释:history_uint表最多保存31天的数据,每隔24小时生成一个分区,这次一共生成14个分区

可以使用一个存储过程来实现7张表的分区:

DELIMITER $$
CREATE PROCEDURE `partition_maintenance_all`(SCHEMA_NAME VARCHAR(32))
BEGIN
       CALL partition_maintenance(SCHEMA_NAME, 'history', 31, 24, 14);
       CALL partition_maintenance(SCHEMA_NAME, 'history_log', 31, 24, 14);
       CALL partition_maintenance(SCHEMA_NAME, 'history_str', 31, 24, 14);
       CALL partition_maintenance(SCHEMA_NAME, 'history_text', 31, 24, 14);
       CALL partition_maintenance(SCHEMA_NAME, 'history_uint', 31, 24, 14);
       CALL partition_maintenance(SCHEMA_NAME, 'trends', 180, 24, 14);
       CALL partition_maintenance(SCHEMA_NAME, 'trends_uint', 180, 24, 14);
END$$
DELIMITER ;

定时任务,使工作自动化:

01 01   * /opt/software/mysql/bin/mysql -uzabbix -pzabbix zabbix -e “CALL partition_maintenance_all(‘zabbix’);”

转载请注明:清麟博客 » zabbix之”表分区”

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