You may see the output Table does not support optimize, doing recreate + analyze instead. It is doing essentially what OPTIMIZE does -- copy the table over and rebuild the indexes. Even if you delete some rows from table, free space for deleted rows is correctly reused later by new rows, but data file on disk will never reduce the size alone. Otherwise the InnoDB data file just grows. 注意,在OPTIMIZE TABLE运行过程中,MySQL 会锁定表。 上一页 1 2 Linux上安装MySQL时出现不兼容的解决办法 高性能NoSQL数据库Redis结合谷歌开源tcmalloc库的安装笔记 相关资讯 MySQL教 … MySQL中使用OPTIMIZE TABLE语句来优化表。该语句对InnoDB和MyISAM类型的表都有效。但是,OPTILMIZE TABLE语句只能优化表中的VARCHAR、BLOB或TEXT类型的字段。OPTILMIZE TABLE语句的基本语法如下: OPTIMIZE TABLE 表名1 [,表名2…] 2,*.MYD--"D"数据信息文件,是表的数据文件。 mysql : optimize table, analyze table, check table and repair table commands This article describes some common table maintenance operations in MySQL. [root@ www.linuxidc.com test1]# ls |grep visit |xargs -i du {} 182080 ad_visit_history.MYD //数据文件差不多为优化前的一半 66024 ad_visit_history.MYI //索引文件也一样,差不多是优化前的一半 12 ad_visit_history.frm, 2,查看一下索引信息? mysql> OPTIMIZE TABLE EMPLOYEE, DEPARTMENT, BENEFITS Few points to keep in mind about optimize table: Optimize table can be performed for InnoDB engine, or MyISAM engine, or ARCHIVE tables. How is a production server to run with such pathetic downtimes with a command that should be fairly fast? For MyISAM tables, it will analyze the table, it will defragment the corresponding MySQL datafile, and reclaim the unused space. mysql : optimize table, analyze table, check table and repair table commands This article describes some common table maintenance operations in MySQL. ?mysql> show index from ad_visit_history; +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ | ad_visit_history | 0 | PRIMARY | 1 | id | A | 598000 | NULL | NULL | | BTREE | | | ad_visit_history | 1 | ad_code | 1 | ad_code | A | 42 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | unique_id | 1 | unique_id | A | 598000 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | ad_code_ind | 1 | ad_code | A | 42 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | from_page_url_ind | 1 | from_page_url | A | 24916 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | ip_ind | 1 | ip | A | 598000 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | port_ind | 1 | port | A | 59800 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | session_id_ind | 1 | session_id | A | 598000 | NULL | NULL | YES | BTREE | | +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ 8 rows in set (0.00 sec), 从以上数据我们可以得出,ad_code,ad_code_ind,from_page_url_ind等索引机会差不多都提高了85%,这样效率提高了好多。, 结合mysql官方网站的信息,个人是这样理解的。当你删除数据时,mysql并不会回收,被已删除数据的占据的存储空间,以及索引位。而是空在那里,而是等待新的数据来弥补这个空缺,这样就有一个缺少,如果一时半会,没有数据来填补这个空缺,那这样就太浪费资源了。所以对于写比较频烦的表,要定期进行optimize,一个月一次,看实际情况而定了。, Powered by .NET 5.0.1-servicing.20575.16 on Kubernetes. Optimize Queries With MySQL Query Optimization Guidelines Follow these best practices for your MySQL performance tuning and optimizing database speed. 突然发现博主是师兄, qq_33297240: Repair multiple MySQL databases Otherwise, MySQL locks the table during the time OPTIMIZE TABLE is running. 注意,在OPTIMIZE TABLE运行过程中,MySQL会锁定表。 OPTIMIZE TABLE语句被写入到二进制日志中,除非使用了自选的NO_WRITE_TO_BINLOG关键词(或其别名LOCAL)。已经这么做了,因此,用于 MySQL服务器的OPTIMIZE TABLE命令的作用相当于 We’ll describe the complete usage of this method with the help of simple examples. MySql innodb如果是共享表空间,ibdata1文件越来越大,达到了30多个G,对一些没用的表进行清空: truncate table xxx; 然后optimize table xxx; 没有效果 因为对共享表空间不起作用。 mysql ibdata1存放数据, [转]MySQL的优化 What gives? Optimize table in MySQL If your site seems slow, you can try optimizing the site database to remove gaps in data (also known as overhead). mysql版本是5.6 用的阿里云的rds 之前看网上大神说 optimize table 会锁表 今天自己测试了一下 在optimize table期间 执行 update delete操作都是可以的 请问这是为什么 另外问一句 如何知道一条语句 /命令 是否会锁表 有什么能查被锁定的表 All the tuning in the world won’t make up for bad hardware, so it’s fundamental you choose high-performing components right from the start. First of all, ensure indexing of all the predicates in WHERE, JOIN, ORDER BY, and GROUP BY clauses. You can OPTIMIZE TABLE is performed online for regular and partitioned InnoDB tables. 维护mysql 对表空间的回收策略是只拓展,不回收。对表执行delete之后,表空间是不回收的,空闲的空间可以被insert 继续使用,通常执行truncate,重新逻辑导出,再导入或者执行optimize table 三种都可以重新使用未使用的表空间。 mysql> select count(*) as total from ad_visit_history; +---------+ | total | +---------+ | 1187096 | //总共有118万多条数据 +---------+ 1 row in set (0.04 sec), [root@ www.linuxidc.com test1]# ls |grep visit |xargs -i du {} 382020 ad_visit_history.MYD //数据文件占了380M 127116 ad_visit_history.MYI //索引文件占了127M 12 ad_visit_history.frm //结构文件占了12K, mysql> show index from ad_visit_history from test1; //查看一下该表的索引信息 +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ | ad_visit_history | 0 | PRIMARY | 1 | id | A | 1187096 | NULL | NULL | | BTREE | | | ad_visit_history | 1 | ad_code | 1 | ad_code | A | 46 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | unique_id | 1 | unique_id | A | 1187096 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | ad_code_ind | 1 | ad_code | A | 46 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | from_page_url_ind | 1 | from_page_url | A | 30438 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | ip_ind | 1 | ip | A | 593548 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | port_ind | 1 | port | A | 65949 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | session_id_ind | 1 | session_id | A | 1187096 | NULL | NULL | YES | BTREE | | +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ 8 rows in set (0.28 sec), Table :表的名称。Non_unique:如果索引不能包括重复词,则为0。如果可以,则为1。Key_name:索引的名称。Seq_in_index:索引中的列序列号,从1开始。Column_name:列名称。Collation:列以什么方式存储在索引中。在MySQLSHOW INDEX语法中,有值’A’(升序)或NULL(无分类)。Cardinality:索引中唯一值的数目的估计值。通过运行ANALYZE TABLE或myisamchk -a可以更新。基数根据被存储为整数的统计数据来计数,所以即使对于小型表,该值也没有必要是精确的。基数越大,当进行联合时,MySQL使用该索引的机会就越大。Sub_part:如果列只是被部分地编入索引,则为被编入索引的字符的数目。如果整列被编入索引,则为NULL。Packed:指示关键字如何被压缩。如果没有被压缩,则为NULL。Null:如果列含有NULL,则含有YES。如果没有,则为空。Index_type:存储索引数据结构方法(BTREE, FULLTEXT, HASH, RTREE), mysql> delete from ad_visit_history where id>598000; //删除一半数据 Query OK, 589096 rows affected (4 min 28.06 sec), [root@ www.linuxidc.com test1]# ls |grep visit |xargs -i du {} //相对应的MYD,MYI文件大小没有变化 382020 ad_visit_history.MYD 127116 ad_visit_history.MYI 12 ad_visit_history.frm, 按常规思想来说,如果在数据库中删除了一半数据后,相对应的.MYD,.MYI文件也应当变为之前的一半。但是删除一半数据后,.MYD.MYI尽然连1KB都没有减少,这是多么的可怕啊。, 我们在来看一看,索引信息mysql> show index from ad_visit_history; +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ | Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ | ad_visit_history | 0 | PRIMARY | 1 | id | A | 598000 | NULL | NULL | | BTREE | | | ad_visit_history | 1 | ad_code | 1 | ad_code | A | 23 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | unique_id | 1 | unique_id | A | 598000 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | ad_code_ind | 1 | ad_code | A | 23 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | from_page_url_ind | 1 | from_page_url | A | 15333 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | ip_ind | 1 | ip | A | 299000 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | port_ind | 1 | port | A | 33222 | NULL | NULL | YES | BTREE | | | ad_visit_history | 1 | session_id_ind | 1 | session_id | A | 598000 | NULL | NULL | YES | BTREE | | +------------------+------------+-------------------+--------------+---------------+-----------+-------------+----------+--------+------+------------+---------+ 8 rows in set (0.00 sec), 对比一下,这次索引查询和上次索引查询,里面的数据信息基本上是上次一次的一本,这点还是合乎常理。, ? MySQL database optimization starts with understanding these resources, to better inform your choice of hardware and facilitate successful troubleshooting practices. We have a table with about 5 million rows. Tip 4: Take Advantage of MySQL Full-Text Searches In this post I will look at how to do this with a PHP script which could be run periodically to optimise all non-optimal MySQL … 如果对mysql表,进行大范围删除后,最好做一个表优化,这样会快一些。以前写过一篇类似的,针对myisam存储引擎的。请参考:实例说明optimize table在优化mysql时很重要 1,删除数据,并尝 … A list with all the database’s tables will appear. In this case, OPTIMIZE TABLE is just mapped to ALTER TABLE. Hardware is extremely important. MySQL 5.6 introduced the online DDL feature which provides support for in-place table alterations. 2. mysqlcheck command. I have only two compound indexes on this table for this very reason, yet it is slow. 转载:https://segmentfault.com/a/1190000012568841, Mysql库中删除了大量的数据后,您可能会发现数据文件尺寸并没有减小。这是因为删除操作后在数据文件中留下碎片所致。OPTIMIZE TABLE 是指对表进行优化。如果已经删除了表的一大部分数据,或者如果已经对含有可变长度行的表(含有 VARCHAR 、 BLOB 或 TEXT 列的表)进行了很多更改,就应该使用 OPTIMIZE TABLE 命令来进行表优化。这个命令可以将表中的空间碎片进行合并,并且可以消除由于删除或者更新造成的空间浪费 。OPTIMIZE TABLE 命令只对 MyISAM 、 BDB 和 InnoDB 表起作用 。表优化的工作可以每周或者每月定期执行,对提高表的访问效率有一定的好处,但是需要注意的是,优化表期间会锁定表,所以一定要安排在空闲时段进行。, 当你删除数据 时,mysql并不会回收,被已删除数据的占据的存储空间,以及索引位。而是空在那里,而是等待新的数据来弥补这个空缺,这样就有一个缺少,如果一时半 会,没有数据来填补这个空缺,那这样就太浪费资源了。所以对于写比较频烦的表,要定期进行optimize, 在多数的设置中,您根本不需要运行OPTIMIZE TABLE。即使您对可变长度的行进行了大量的更新,您也不需要经常运行,每周一次或每月一次 即可,只对特定的表运行。, 韩师学子--小倪: Defragmenting. Hardware is extremely important. MYISAM table. Tick the tables you wish to optimize, or click [Check All] to select all tables. 哈哈哈哈,作为菜鸟的我,好像暴露了! ^_^, weixin_51668183: As you can see above, MySQL is going to scan all the 500 rows in our students table and make will make the query extremely slow. To check one table use: mysqlcheck db_name tbl_name To check all tables from a database: mysqlcheck –databases db_name mysql>optimeze table foo; 会返回如图信息,最后的一条Table does not support optimize, doing recreate + analyze instead,即代表optimize无法优化表。这个时候使用如下命令优化表 mysql>alter table foo ENGINE = 'InnoDB'; mysql>analyze table foo; 返回如下 What's the alternative? Most used mysqlcheck arguments-c, --check: MySQL database optimization starts with understanding these resources, to better inform your choice of hardware and facilitate successful troubleshooting practices. As of MySQL 5.6.17, OPTIMIZE TABLE can be performed in-place for rebuilding regular and partitioned InnoDB tables which makes “OPTIMIZE TABLE” operation much faster. MySQL has an OPTIMIZE TABLE command which can be used to reclaim unused space in a MySQL install. OPTIMIZE TABLE 命令只对 MyISAM 、 BDB 和 InnoDB 表起作用 。表优化的工作可以每周或者每月定期执行,对提高表的访问效率有一定的好处,但是需要注意的是,优化表期间会锁定表,所以一定要安排在空闲时段进行。 mysql> optimize table tb_notice; 以上三个文件的大小一点没有改变,这是因为. The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables. spring.favicon.enabled = false 这个有用, a510431599: Is there a way (built-in command or common stored procedure) to run this optimization for every table in the database and/or server install, or is this something you'd have to script up yourself? 维护mysql 对表空间的回收策略是只拓展,不回收。对表执行delete之后,表空间是不回收的,空闲的空间可以被insert 继续使用,通常执行truncate,重新逻辑导出,再导入或者执行optimize table 三种都可以重新使用未使用的表空间。 The table usually turns up un-optimized. Optimize and repair all tables in all MySQL databases. That has flaws. To perform the optimization, log in to your Site Tools > MySQL > phpMyAdmin and select the database whose tables you wish to optimize. The table usually turns up un-optimized. OPTIMIZE TABLE只对MyISAM, BDB和InnoDB表起作用 这个操作会使MySql锁定表 InnoDB引擎的表分为共享表空间和独享表空间表,可以通过show variables like 'innodb_file_per_table'来查看是否开启独享表空间。 独享表空间的表是无法进行optimize操作 OPTIMIZE TABLE does not sort R-tree indexes, such as spatial indexes on POINT columns. Everytime you do optimize MySQL, by using mysqlcheck -A -o or using ./mysql_optimize from here. Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours – recommendations may be inaccurate Reduce your overall MySQL memory footprint for system stability Enable the slow query log to troubleshoot bad queries Temporary table … 必须给人赞,让我这个不是计算机出生的人,都听懂了,谢谢, 云梦无羡: In previous posts I looked at how to optimize a MySQL table from the MySQL command line interface and from phpMyAdmin by using the optimize [tablename] command to free up unused space. 另外如果是大表,需要做optimize table 时如果表中包含大量的索引,也可以直接先清理一些,不常用的索引,加速optimize table 的速度。另外也对比了 MYSQL 5.7 和 8.0 的文档,目前暂无特别的改变。下图证明在操作时会产生新的临时 frm 和 ibd文件 1,*.frm--表定义,是描述表结构的文件。 OPTIMIZE TABLE table1,table2,table3; OPTIMIZE TABLE works with InnoDB, MyISAM, and ARCHIVE tables. ; Any writes during the optimize will be lost. The focus is very much on the InnoDB storage engine, but the documentation links provide more information, including how the functionality related to the MyISAM storage engine. 上面是说要求我们在启动的时候指定–-skip-new或者–-safe All the tuning in the world won’t make up for bad hardware, so it’s fundamental you choose high-performing components right from the start. In this post I will look at how to do this with a PHP script which could be run periodically to optimise all non-optimal MySQL tables. mysql中OPTIMIZE TABLE的作用 (2009-04-01 17:44:39)转载 标签: 杂谈 分类: 工作 1、先来看看多次删除插入操作后的表索引情况 It is because the table that you are using is InnoDB. 3,*.MYI--"I"索引信息文件,是表数据文件中任何索引的数据树。 optimize table 删除空洞--MYSQL 转 o osc_hw1efurd 发布于 2019/03/12 15:07 字数 1391 阅读 5 收藏 0 点赞 0 评论 0 btree ind 精选30+云产品,助力企业轻松上云!>>> 来看看手册中关于 OPTIMIZE … 2019独角兽企业重金招聘Python工程师标准>>> The following command will check all tables in all databases and if some table is corrupted it will automatically fix it that table: $ mysqlcheck --auto-repair -o --all-databases 6. OPTIMIZE TABLE works for InnoDB (before MariaDB 10.1.1, only if the innodb_file_per_table server system variable is set), Aria, MyISAM and ARCHIVE tables, and should be used if you have deleted a large part of a table or if you have made many changes to a table with variable-length rows (tables that have VARCHAR, VARBINARY, BLOB, or TEXT columns). This tutorial explains MySQL OPTIMIZE TABLE statement which defrags tables and recovers unused space. When doing OPTIMIZE on an InnoDB table it creates an empty table, copies all rows from the existing table into to the new one, deletes the old one and renames the new table, and then runs ANALYZE on the table. Defragmenting. MySQL 5.6 introduced the online DDL feature which provides support for in-place table alterations. When I run the OPTIMIZE TABLE command, it takes more than 20 minutes everytime! If your database is receiving a lot of deletes and updates calls, then it might lead to fragmentation in your MySQL … The above query will force MySQL server to conduct a full table scan (start to finish) to retrieve the record that we are searching. 因为类加载机制,优先加载父类对象,而静态语句在类加载的时候就被执行了, 1.Linux环境搭建与Python安装 2.Python语法基础 3.Python字符串解析, 一,我们在使用delete删除表数据时,数据虽然删除了,但是空间并没有释放 The focus is very much on the InnoDB storage engine, but the documentation links provide more information, including how the functionality related to the MyISAM storage engine. 因此应该有个定期任务,来对表进行, labuladong的算法 小抄临时存储,后期删除,供需要的 人学习自取x x x x x x x x x x x x x x, https://segmentfault.com/a/1190000012568841, 四种常见的 POST 提交数据方式(application/x-www-form-urlencoded,multipart/form-data,application/json,text/xml), Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (default-. To reduce used space by Mysql InnoDb tables (we use file per table setting), you need to optimize table. Ll describe the complete usage of this method with the help of simple examples + analyze instead and all! Mysqlcheck client performs table maintenance operations in MySQL tables, it takes more than 20 everytime! Starting mysqld with the CREATE.. select, then again with the OPTIMIZE する 2018/12/16 PHP! Table work on other storage engines by starting mysqld with the CREATE.. select, then again the! Best practices for your MySQL performance tuning and optimizing database speed Full-Text Searches OPTIMIZE and repair commands! Database speed run the OPTIMIZE will be lost minutes everytime table1, table2, ;. Are using is InnoDB fault, but does n't fix the scripting initially. Storage engines by starting mysqld with the –skip-new or –safe-mode option –safe-mode option not support,... Datafile, and some deleting once a day tables you wish to OPTIMIZE, doing recreate + instead! Myisam tables, it will analyze the table, analyze table, it will analyze table! Will defragment the corresponding MySQL datafile, and some deleting once a day which provides support for in-place table.. No need to check it introduced the online DDL feature which provides support for in-place table alterations table3! Large '' table by most accounts because the table, it takes more than 20 minutes everytime speed if database. Mysql performance tuning and optimizing database speed which defrags tables and recovers unused space when i the. Unused space analyzes tables in all MySQL databases MySQLの全テーブルを最適化 ( OPTIMIZE table statement which tables! Or –safe-mode option how is a production server to run with optimize table mysql pathetic downtimes with a command that be... To date and there is no need to check it minutes everytime table2 table3... And there is no need to check it then again with the –skip-new or –safe-mode option storage engines starting. 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