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の全テーブルを最適化(OPTIMIZE TABLE)する 2018/12/16 2019/3/31 PHP , プログラミング 独立してからはオープンソース化の流れとライセンスの都合上でPostgreSQLを触る機会が多くなりましたが、MySQLを本格的に触り始めたのはわりと最近になります。 What's the alternative? Tick the tables you wish to optimize, or click [Check All] to select all tables. 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 In this case, OPTIMIZE TABLE is just mapped to ALTER TABLE. MySQL 5.6 introduced the online DDL feature which provides support for in-place table alterations. 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. OPTIMIZE TABLE is performed online for regular and partitioned InnoDB tables. (Bug #23578) Defragmenting. ?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. I ran this query and it identified 148 tables for optimization. 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 To perform the optimization, log in to your Site Tools > MySQL > phpMyAdmin and select the database whose tables you wish to optimize. 标签:mysql, optimize table, 优化 今天在看CU的时候,发现有人问有关optimize来表优化的问题,当年因为这个问题,困扰我很长一段时间,今天有空我把这个问题,用实际数据来展示出来,让大家可以亲眼来看看,optimize table的重要作用,而不是似是而非的估计了。 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. 3,*.MYI--"I"索引信息文件,是表数据文件中任何索引的数据树。 ... 如果一个表数据量比较大,且经常有插入或删除操作,会产生大量的空间碎片(主要由于对表进行delete操作时,服务器并不一定会释放磁盘空间, 或者数据块大小的影响)。如果不定期清理这些碎片,数据库的性能会加速下降。 mysql help: You can makeOPTIMIZE TABLE work on other storage engines by starting mysqld with the –skip-new or –safe-mode option. 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. When I run the OPTIMIZE TABLE command, it takes more than 20 … 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. Optimize and repair all tables in all MySQL databases. It is because the table that you are using is InnoDB. This is not a "large" table by most accounts. 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. Hardware is extremely important. Everytime you do optimize MySQL, by using mysqlcheck -A -o or using ./mysql_optimize from here. 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 … 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: 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). 以上三个文件的大小一点没有改变,这是因为. When I run the OPTIMIZE TABLE command, it takes more than 20 minutes everytime! For MyISAM tables, it will analyze the table, it will defragment the corresponding MySQL datafile, and reclaim the unused space. MySQL has an OPTIMIZE TABLE command which can be used to reclaim unused space in a MySQL install. You can OPTIMIZE TABLE。被删除的记录被保持在链接清单中,后续的INSERT操作会重新使用旧的记录位置。您可以使用OPTIMIZE TABLE来重新 利用未使用的空间,并整理数据文件的碎片。在多数的设置中,您根本不需要运行OPTIMIZE TABLE。 Hardware is extremely important. mysql : optimize table, analyze table, check table and repair table commands This article describes some common table maintenance operations in MySQL. 上面是说要求我们在启动的时候指定–-skip-new或者–-safe 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 If your database is receiving a lot of deletes and updates calls, then it might lead to fragmentation in your MySQL … This can help restore speed if the database is at fault, but doesn't fix the scripting that initially created the overhead. 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. I’ve been researching how to optimize only fragmented tables in MySQL and reviewed this post on optimizing tables.It basically performs a query against the information_schema database for any table with data_free > 0 and builds a SQL statement to OPTIMIZE only those tables. The above query will force MySQL server to conduct a full table scan (start to finish) to retrieve the record that we are searching. 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). Table is already up to date means that the table is already up to date and there is no need to check it. 突然发现博主是师兄, qq_33297240: 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 Most used mysqlcheck arguments-c, --check: This tutorial explains MySQL OPTIMIZE TABLE statement which defrags tables and recovers unused space. Do all the RENAMEs in a single RENAME statement to avoid the brief time when no table exists: RENAME TABLE real TO old, new TO real; 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 spring.favicon.enabled = false 这个有用, a510431599: A list with all the database’s tables will appear. MySQL database optimization starts with understanding these resources, to better inform your choice of hardware and facilitate successful troubleshooting practices. 哈哈哈哈,作为菜鸟的我,好像暴露了! ^_^, weixin_51668183: 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. Defragmenting. Tip 4: Take Advantage of MySQL Full-Text Searches OPTIMIZE TABLE table1,table2,table3; OPTIMIZE TABLE works with InnoDB, MyISAM, and ARCHIVE tables. How is a production server to run with such pathetic downtimes with a command that should be fairly fast? ?mysql> optimize table ad_visit_history; //删除数据后的优化 +------------------------+----------+----------+----------+ | Table | Op | Msg_type | Msg_text | +------------------------+----------+----------+----------+ | test1.ad_visit_history | optimize | status | OK | +------------------------+----------+----------+----------+ 1 row in set (1 min 21.05 sec), ?? 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. ; You are optimizing twice -- once with the CREATE ..SELECT, then again with the OPTIMIZE. That has flaws. 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…] 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). 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? 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? MySQL database optimization starts with understanding these resources, to better inform your choice of hardware and facilitate successful troubleshooting practices. 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 The table usually turns up un-optimized. To reduce used space by Mysql InnoDb tables (we use file per table setting), you need to optimize table. The table usually turns up un-optimized. We have a table with about 5 million rows. I have only two compound indexes on this table for this very reason, yet it is slow. 2019独角兽企业重金招聘Python工程师标准>>> 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。 [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? OPTIMIZE TABLE does not sort R-tree indexes, such as spatial indexes on POINT columns. Optimize Queries With MySQL Query Optimization Guidelines Follow these best practices for your MySQL performance tuning and optimizing database speed. 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。, ? Repair multiple MySQL databases 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. 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 … Otherwise, MySQL locks the table during the time OPTIMIZE TABLE is running. MYISAM table. Lot of updating, inserting, and some deleting once a day. 4. 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 MySQL 5.6 introduced the online DDL feature which provides support for in-place table alterations. 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 … It is doing essentially what OPTIMIZE does -- copy the table over and rebuild the indexes. 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 … 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: 1,*.frm--表定义,是描述表结构的文件。 We’ll describe the complete usage of this method with the help of simple examples. 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. ; Any writes during the optimize will be lost. The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables. 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 … 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. MySQL 5.6.17 の時点では、OPTIMIZE TABLE は、InnoDB の通常のテーブルとパーティション化されたテーブルに対してオンラインで実行されます。 デフォルトでは、サーバーは OPTIMIZE TABLE ステートメントをバイナリログに書き込み、それらがレプリケーションスレーブにレプリケートされるよう … 2. mysqlcheck command. 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. First of all, ensure indexing of all the predicates in WHERE, JOIN, ORDER BY, and GROUP BY clauses. 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; 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. You may see the output Table does not support optimize, doing recreate + analyze instead. 2,*.MYD--"D"数据信息文件,是表的数据文件。 Otherwise the InnoDB data file just grows. 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 : optimize table, analyze table, check table and repair table commands This article describes some common table maintenance operations in MySQL. 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 check one table use: mysqlcheck db_name tbl_name To check all tables from a database: mysqlcheck –databases db_name From the [With selected:] drop-down menu choose Optimize table. It will analyze the table over and rebuild the indexes ll describe the complete of! Describe the complete usage of this method with the CREATE.. select then! This can help restore speed if the database ’ s tables will.! Menu choose OPTIMIZE table, analyze table, it takes more than 20 minutes everytime indexes, such as indexes. Tables in all MySQL databases MySQLの全テーブルを最適化 ( OPTIMIZE table, it takes more 20... And recovers unused space created the overhead you wish to OPTIMIZE, doing +... Group by clauses tables you wish to OPTIMIZE, doing recreate + analyze instead at! Doing essentially what OPTIMIZE does -- copy the table during the OPTIMIZE be. Mysqlcheck client performs table maintenance operations in MySQL select, then again with the table!, table3 ; OPTIMIZE table is already up to date and there no. Online DDL feature which provides support for in-place table alterations the indexes 独立してからはオープンソース化の流れとライセンスの都合上でPostgreSQLを触る機会が多くなりましたが、MySQLを本格的に触り始めたのはわりと最近になります。 Defragmenting it will defragment corresponding! Then again with the OPTIMIZE table does not support OPTIMIZE, doing recreate analyze! 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