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Dec 9, 2010 · Why you shouldn’t necessarily optimize tables with MySQL OPTIMIZE. Optimize Databases. //Christian. commandline command: Copy to clipboard. 5, the client was called mysqlcheck. The results look something like this: my_db_name. Optimize Tables using Mysqlcheck. Add two BAT scripts: mysqlcheck --user=root --password=secret-pass --analyze --all-databases; Sep 7, 2017 · MySQL 数据库 mysqlcheck 的使用方法的相关知识是本文我们主要要介绍的内容，我们知道，mysqlcheck，是mysql自带的可以检查和修复MyISAM表，并且它还可以优化和分析表，mysqlcheck的功能类似myisamchk，但其工作不同。 Oct 1, 2021 · mysqlcheck is a command to give to the OS via its "shell". A sample of stored routine is shown below. The exact changes made to each table depend on the storage engine used by that table. Optimizing is going to lock the table in question, and that’s going to be negative for flow control 495. mysqlcheck uses the SQL statements CHECK TABLE, REPAIR TABLE, ANALYZE TABLE, and OPTIMIZE TABLE in a convenient way for the user. -- if you are signed in as a superuser. 7 or 8. Nirjonadda. Try using the base directory to get the command to run: Note: Make sure the version is correct. For InnoDB tables, OPTIMIZE TABLE is mapped to ALTER TABLE, which Apr 28, 2017 · OPTIMIZE TABLE works with InnoDB, MyISAM, and ARCHIVE tables. 23. Automating mysql defragmentation using cron Feb 13, 2022 · Check and repair and flush tables are not relevant unless you use MyISAM tables. The auto repair option automatically fixes a checked table if found corrupted. 使用 Ubuntu 终端优化所有表：. Stop apache/httpd server. For specific database: mysqlcheck è uno strumento di manutenzione che permette di verificare, riparare, analizzare e ottimizzare più tabelle in una volta dalla riga di comando. まぁ何のことはなく、SHOW TABLE STATUSで Nov 2, 2009 · In case you didn’t know, there is a helpful MySQL utility called mysqlcheck, available as of version 3. I poked around in Workbench and could not find any maintenance or optimization functions. to optimize all tables. mysqlcheck just runs a bunch of 'optimize table' SQL statements for you, so functionally they do the same thing. The downside is that you sometimes cannot optimize a large table when you belatedly realize that it's consuming too much of the available hard disk space. Option. mysqlcheck -p --auto-repair asterisk. 90GB would take hours, maybe days, depending on tunables, disk speed, RAID, etc, etc. 15. To repair all the MySQL databases, use the following mysqlcheck command: mysqlcheck --repair --all-databases Jul 25, 2008 · OPTIMIZE TABLE will not sort R-tree indexes unless you are using version >= 5. Make sure you run then in correct sequence. To avoid timeouts, the semaphore wait threshold (600 seconds) is extended by 2 hours (7200 seconds) for CHECK. To check one table use: mysqlcheck db_name tbl_name. 5 times the size of the table that mysql is attempting to optimize or 1. Replace the [database name] with your actual database name. sudo mysqlcheck --analyze --all-databases Then, do the optimize once a month or once a quarter. You can optimize single table like this : mysqlcheck -u root -o database_name table_name. Sep 17, 2016 · OPTIMIZE TABLE table_name; Now this can be an enormous task when you have many databases and tables but there is an alternative using the mysqlcheck command $ mysqlcheck -u root -p –auto-repair –optimize –all-databases. It is essentially a commandline interface to the CHECK TABLE, REPAIR TABLE, ANALYZE TABLE and OPTIMIZE TABLE commands, and so, unlike myisamchk and aria_chk, requires the server to be running. exe. It determines which statements to use for the operation you want to perform, and then sends the Sep 29, 2016 · i haven't been able to find any relevant information about exit codes of mysqlcheck, for instance, to just send an e-mail if there is really something wrong. employee OK Dec 11, 2023 · MySQL でテーブルを最適化するタイミングと理由. I know running this command will take a very long time on my database it could take days because of the sheer size of the database. In the above tutorial, we learned how to check and repair MySQL table using mysqlcheck command-line tool. 38. 使用 Windows 命令行优化所有表：. To check all tables in all databases for corruption and errors and also fix them in one go, this is your command: mysqlcheck -u username -p password --check --optimize --auto-repair --all-databases The benefit of using mysqlcheck is that you do not have to stop the server to perform table maintenance. $ mysqlcheck -o --all-databases For user reference, this is a table showcasing the most used options for the mysqlcheck database command. InnoDB will re-use empty extents automatically. While --optimize doesn't appear to first go through the identical motions to "check" the tables, it does rebuild them, which would imply that it has to be able Oct 19, 2012 · 1. Mar 29, 2017 · Thanks for being persistent in telling me I'm wrong! "mysqlcheck is similar in function to myisamchk, but works differently. mysqlcheck command. Jan 22, 2022 · 今日も小ネタで、 MySQL で特定のデータベース内のすべてのテーブルを一括で OPTIMIZE する方法についてです。 確認時のバージョン. Example Code: Dec 16, 2018 · WHM currently only allows you to check, repair and optimize each database one at a time, but that’s time consuming and boring! Here’s a quick way to check, repair and optimize all the databases right from the Terminal! It may be a good idea to pipe these commands to a file for reviewing, and definitely a good idea to back them all up before The default option is --optimize. Or Else you can use 3 different commands for these: mysqlcheck --all-databases -a (Analyse) mysqlcheck --all-databases -r (Repair) mysqlcheck --all-databases -o (Optimize) Apr 20, 2013 · mysqlcheck -Aos -u USER -pPASS. MySQL 5. edit. 0. mysqlcheck -uroot -p --optimize --databases myDatabase The only one that has mysql. If you are using latest VICIbox, then you should use these commands. answered Feb 12, 2012 at 23:06. When I run an optimize for all databases with this command: mysqlcheck -u root --auto-repair --check --optimize --all-databases. Please note that MyISAM is a default storage engine of MySQL, unless you change it. $ mysqlcheck --auto-repair -o customers Sep 2, 2017 · How to Optimize the table using mysqlcheck? If you had deleted plenty of rows from a table, it’s a good practice to optimize the table to get unused space and defragment the data. Each table is locked and therefore unavailable to other sessions while it is being processed, although for check operations, the table is locked with a READ lock only (see Section 13. cnf file in the home directory of the user running it and will pick up options in the [client] section of that file. Scheduling options will depend on your platform and network administrators preferences. To automate MySQL maintenance using SqlBak follow these steps: Install a thin client on the server and connect the database (connection details are available here ). Dec 18, 2021 · The application/service timeout while executing OPTIMIZE TABLE. This is illogical and needs to be reversed. With InnoDB, OPTIMIZE yet again maps to an ALTER TABLE statement, which means that there will be a table rebuild, which in turn updates the indexes (causing, obviously, a lock on the table). Cursor defined in this procedure selects all tables from within current db (in which this sp is defined). You could use stored routines to optimize tables. Step 3. Sep 4, 2012 · 1. 最適化には、いくつかのレベルでの構成、チューニング、およびパフォーマンスの測定が含まれます。. 데이터베이스 전체를 한꺼번에 최적화하려면 --all-databases 옵션을 사용하면 됩니다. delete ib_logfile0 and ib_logfile1. The client can be used to execute the CHECK TABLE, REPAIR TABLE, ANALYZE TABLE, and OPTIMIZE TABLE statements. cnf and then restart MySQL server again. The following mysqlcheck command checks, optimizes, and auto-repairs all corrupted tables in the “customer” database. Check the whole database with: mysqlcheck Mar 20, 2022 · Repair and Optimize MySQL databases. May 24, 2020 · C:\Users\JayRizzo> mysqlcheck -u root --auto-repair --optimize --all-databases # 'mysqlcheck' is not recognized as an internal or external command, # operable program or batch file. Note that 'optimize table' for innodb just maps to an 'ALTER TABLE foo engine = innodb' statement. It determines which statements to use for the operation you want to perform, and then sends the statements to mysqlcheck -r [database name] Where, mysqlcheck is the command to check the database, -r is the command to repair the corrupted tables. Locking is a requirement. OR mysqlcheck -Aor. There's a command to optimize and repair all databases: mysqlcheck --user=root --password=PASSWORD_FOR_ROOT --auto-repair --optimize --all-databases How can I skip a single, specific database from this process, while optimizing and repairing the other databases? --skip-database=DATABASE_NAME seems like it doesn't work. mysqlcheck has a special feature compared to other client programs. Restart the MySQL service. This is the same as --databases with all databases selected. May 09, 2011 03:42PM Re: WHAT does mysqlcheck OPTIMIZE command do? Peter Brawley. cron으로 주기적으로 최적화하기. 34 OR >= 5. 2, “Using Option Files” . mysqlcheck supports the following options, which can be specified on the command line or in the [mysqlcheck] and [client] groups of an option file. You can ignore these notes. 5 times the largest table in the database, if we run mysqlcheck. --all-databases (-A) Check all the databases. You can check and repair all tables for specific database with the command: sudo mysqlcheck --auto-repair --optimize --databases <database name> Jan 16, 2013 · sqlbot@dev:~$ mysqlcheck --check --optimize --all-databases --verbose Error: mysqlcheck doesn't support multiple contradicting commands. # mysqlcheck -u username -p --auto-repair --check --optimize database_name. If the forum gets unavailable then it would make sense to schedule mysqlcheck via cron but not so often. May 10, 2011 · For MyISAM tables, OPTIMIZE TABLE works as follows: If the table has deleted or split rows, repair the table. Windows 명령줄을 사용하여 모든 테이블 최적화: -- Syntax: mysqlcheck -o your_database_name -u username -pPassword. sudo mysqlcheck --optimize --all-databases. table1 note : Table does not support optimize, doing recreate + analyze instead status : OK my_db_name. Rather, it just dumped core immediately. Step 4. Ubuntu 터미널을 사용하여 모든 테이블 최적화: -- if you are signed in as a superuser. 2. If you’re running Innodb Plugin on Percona Server with XtraDB you get the benefit of a great new feature – ability to build indexes by sort instead of via insertion. Utilizzo: . This is a perfect place to stick the login information as we can make the file readable only by that user. Enter Password:****. exe is MySQL Workbench CE 5. As the root user, type the following command: cd /var/lib/mysql. this one will optimize table 'user' of 'mysql' database. This can be a more convenient means of repairing tables because you can use the --databases or --all-databases option to repair all tables in specific databases or all databases, respectively: Jan 3, 2011 · mysqlcheck -u root -p -A --auto-repair Run mysqlcheck with the root user, prompt for a password, check all databases, and auto-repair any corrupted tables. Client used in maintenance tasks for tables. The key advantage of using mysqlcheck is that it allows for easy automation of I usually use mysqlcheck with --optimize and --databases combination. -- Syntax: mysqlcheck -o your_database_name -u username -pPassword. You should see the following page: Then you should get a confirmation that the command been executed successfully: Conclusion. Create a maintenance job. --analyze (-a) Jul 2, 2015 · OPTIMIZE TABLE tbl_name [, tbl_name] Witch soon lead me to the more powerful. If mysqlcheck --check --optimize --auto-repair was executed, the binary logs need to Sep 19, 2021 · This can all be rectified by running mysqlcheck -u myuser -p -o my_db_name. After the OPTIMIZE is complete, you have probably seen a message saying that InnoDB doesn’t support that feature, so the table was recreated. 04 and Debian 10. Step 1. アプリケーションがデータベースに対して多くの DELETE および UPDATE 操作を実行している場合、MySQL のデータファイルが断片化される可能性が高くなります。. Mostly MyISAM is set as default engine to check and repair all the The default behavior of checking tables ( --check) can be changed by renaming the binary. mariadb-check is a maintenance tool that allows you to check, repair, analyze and optimize multiple tables from the command line. 13. Once the repair is done, optimize the databases. conf and ran 'service mysql-server restart'. Share. It is not a command to use inside the "commandline tool" mysql; that would be OPTIMIZE TABLE as mentioned in a Comment. /client/my mysqlcheck --repair provides command-line access to the REPAIR TABLE statement. 3) Optimize: Like a defrag operation, the optimize tables command reclaims unused space. その結果、未使用のスペースが発生し Overview. There is also an option to repair all the databases. The documentation you linked to states: "mysqlcheck uses the SQL statements CHECK TABLE, REPAIR TABLE, ANALYZE TABLE, and OPTIMIZE TABLE in a convenient way for the user. While the name "optimize" is tempting, it is rarely worth bothering with. Prior to MariaDB 10. Automating mysql defragmentation using cron Since this is on FreeBSD, I added mysql_args="--skip-new" to /etc/rc. TABLE tbl_name [, tbl_name] OPTIMIZE TABLE reorganizes the physical storage of table data and associated index data, to reduce storage space and improve I/O efficiency when accessing the table. # mysqlcheck -o filecloud sessions -u root -p Enter password: filecloud. mysqlcheck is a maintenance tool that allows you to check, repair, analyze and optimize multiple tables from the command line. 早速結論ですが、 mysqlcheck コマンドの --optimize オプションを使えば Sep 8, 2022 · To use mysqlcheck, follow these steps: 1. This rebuilds the entire table. Example Code: -- Syntax: Use your_database_name; mysql> USE test; Once connected with the desired database, use the following query to get the table’s status. mysqlcheck -o <db_schema_name> I don't have a test area to use this command on as we only have one database. “note : Table does not support optimize, doing recreate + analyze instead” if you have some InnoDB tables. Apr 25, 2016 · mysqlcheck is the command that is executed from the Linux prompt. Description. 6 版本运行状态下（mysqlcheck是个在线工具）, 不同的存储引擎对于这个命令的支持程度不同（指的是 check, repair, analyze, optimize)，下面内容偏于操作，主要基于 innodb 引擎。 In this situation, we have a special tool called “mysqlcheck” which checks, repairs, and optimizes all tables in the databases. Seriously, there is almost never a need to OPTIMIZE an InnoDB table. 3. FLUSH LOGS is not necessary. The previous command checks all of the tables in the specified database. If you invoke mysqlrepair, it repairs tables. To check all tables from a database: mysqlcheck –databases db_name. Nov 2, 2023 · The mysqlcheck command uses the OPTIMIZE TABLE SQL statement internally to perform the optimization. The main operational difference is that mysqlcheck must be used when the mysqld server is running, whereas myisamchk should be used when it is not. Well, once mysqld was invoked with --skip-new, running 'mysqlcheck --optimize' no longer complained about the tables not supporting optimize. mysqlcheck -p --optimize asterisk. Follow. Method #5: Repair During Server Startup. Feb 15, 2024 · 优化一个 MySQL 数据库中的所有表. Jun 3, 2024 · It’s a command-line utility that can check, repair, and optimize all database tables. To optimize in all databases on server just tables, where there is minimum 10MB of overhead and it is at least 10% of table size, we created simple bash script: Jun 30, 2023 · mysqlcheck – analyze stellar. It determines which statements to use for the operation you want to perform, and then sends the statements to May 2, 2013 · Another interesting way to accomplish something like an optimize in a more online fashion might be to use pt-online-schema-change to rebuild the table in a more online fashion. 10 years ago. The mysqlcheck client performs table maintenance: It checks, repairs, optimizes, or analyzes tables. To do that, use ‘-o’ option with the mysqlcheck command as shown below. Sep 14, 2020 · To optimize all tables on your server in all databases you can use e. It determines which statements to use for the operation you want to perform, and then sends the statements to the server to be executed. mysqlcheck -p --check asterisk. Nov 26, 2020 · Jun 24, 2015: guideline for calling optimize table after alter table? Feb 27, 2013: What is the difference between optimize table and analyze table in mysql; Aug 04, 2011: Optimizing InnoDB default settings; I recommend doing analyze daily or weekly. When mysqlcheck is run, like other MariaDB utilities, it will automatically check for a . (For MyISAM Engine) First, check a specific table: You can execute this command by giving DatabaseName and Table name. Step 5. -- if you are not signed in as a superuser. com The benefit of using mysqlcheck is that you do not have to stop the server to perform table maintenance. 3 mysqlcheck — A Table Maintenance Program. To auto-repair all MySQL databases, run: sudo mysqlcheck --check --auto-repair --all-databases. # mysqlcheck -u [DB계정] -p [패스워드] --optimize --all-databases. Replace username with your MySQL username and database_name with your database name. After you have successfully fixed the crashed innodb table, don't forget to remove #set-variable=innodb_force_recovery=6 from my. cnf. ibd file, use the innochecksum command. But it does not have mysqlcheck. Aug 5, 2009. The benefit of using mysqlcheck is that you do not have to stop the 以下的例子都是基于 MySQL 5. Stop and disable any cron that executes any task related to database. Reasoning May 9, 2011 · WHAT does mysqlcheck OPTIMIZE command do? yvonne kire. I really think mysqlcheck should show only errors rather than showing notes. how can I see which tables are in need of defragmenting? Maybe OPTIMIZE TABLE will work where mysqlcheck didn't? Or what else should I try? . It determines which statements to use for the operation you want to perform, and then sends the statements to Apr 20, 2015 · 사용법에는 하나의 DB단위씩 최적화하도록 되어있습니다. mysql> mysqlcheck -c TestDB TestTable -u root -p. For all databases: $ mysqlcheck -u root -p --auto-repair --check --optimize --all-databases. user OK. Sep 29, 2012 · mysqlcheck -Aos -u USER -pPASS. The following optimizes employee table that is located in thegeekstuff database. I know that some of this is informational messages, and these can be ignored, however I am wondering how to get more info about these errors. OPTIMIZE TABLE is not usually needed in the default storage engine, InnoDB. When you run mysqlcheck with the -o flag, it connects to the MySQL server, selects the appropriate database and table, and then runs the OPTIMIZE TABLE command. mysql. table2 note : Table does not support optimize, doing recreate + analyze instead status : OK etc Feb 15, 2024 · First, we should analyze the tables that we want to optimize. This effectively creates a new table, copies the data, then drops the old table. sh or . May 23, 2010 · The observed and reported behavior is that when running mysqlcheck --check --optimize --auto-repair it logs - in the binary log - a statement to execute OPTIMIZE first, and only then REPAIR when a table is broken. 5. The analyze option updates the index statistics which are used to optimize the execution plan. May 21, 2021 · The following command can be used to check and repair all MySQL databases on a Ubuntu or Debian Linux System. Option Description Nov 5, 2023 · MySQLcheck is a command-line tool provided by MySQL that allows users to check, repair, analyze, and optimize MySQL database tables. 아래와 같이 cron에 등록해 Dec 13, 2017 · That said, when MySQL optimizes a table, it creates a new table in the process. Share Nov 1, 2022 · Nice to use command for Ubuntu servers is mysqlcheck, that can automatize the check and repair. 15, in which this issue has been fixed. mysqlcheck は sql ステートメント check table、repair table、analyze table、および optimize table をユーザーにとって便利な方法で使用します。 実行する操作に対してどのステートメントを使用するか決定し、実行のためサーバーにステートメントを送信します。 4. It determines which statements to use for the operation you want to perform, and then sends the statements to Oct 13, 2023 · This is done using the mysqlcheck program, adding the optimize table option as below. It fixed some tables but MySQLTuner still finds 19 tables fragmented. e. Dec 21, 2011 · While mysqlcheck is executing the analyze command the table is locked and available for other process only in the read mode. It does exactly what we need. Table 6. $ mysqlcheck -u root -o mysql user. For information about option files used by MySQL programs, see Section 6. We must be connected to our database using the following command. The upside is that you can kill it prematurely without data loss. 5, “LOCK Dec 16, 2018 · OPTIMIZE TABELを全テーブルに実行. 1. 7. # mysqlcheck -o thegeekstuff employee -u root -p Enter password: thegeekstuff. As the root user, navigate to the directory where the databases are stored: sudo su cd /var/lib/mysql 2. 業務の役割 (開発者、データベース管理者、また The default behavior of checking tables ( --check) can be changed by renaming the binary. NOTE: There needs to be free space available, 1. OPTIMIZE may free up some of the free space caused by DELETEs and UPDATEs. Jun 6, 2024 · Running mysqlcheck to Optimize and Repair Tables in a MySQL Database. Step 2. I've tested the commands on Ubuntu 20. Run this command: mysqlcheck --database db_name table_name -uroot -p. #1. This seems like a really smart thing to do on a regular basis. thegeekstuff is the database; DEPARTMENT is the table inside thegeekstuff database that should be optimized-u root indicates that mysqlcheck command should use “root” as the mysql user to The benefit of using mysqlcheck is that you do not have to stop the server to perform table maintenance. It can still be accessed under this name, via a symlink in Linux, or an alternate binary in Windows. my. TABLE execution. At least, that is what it does for MyISAM. 13 mysqlcheck Options. -o option is to indicate that mysqlcheck should perform “optimize table” operation. By using this command, you can ensure the integrity of your database and improve its performance. To verify the entire contents of an InnoDB . See full list on rosehosting. $ mysqlcheck -u root -p --check --databases dbname. If the table's statistics are not up to date (and the repair could not be accomplished by sorting the index), update them. You could add conditions for checking MYISAM tables with condition in WHERE as in example: 第 8 章 最適化. Once you have entered the password this utility will repair and optimize all tables in all databases. Not all operations performed by the mariadb-check command are supported by all storage engines. この章では、MySQL のパフォーマンスを最適化する方法について説明し、例を示します。. Start MySQL server. 하나의 MySQL 데이터베이스에서 모든 테이블 최적화. The default behavior of checking tables (--check) can be changed by renaming the binary. It determines which statements to use for the operation you want to perform, and then sends the statements to Jun 24, 2021 · Running . Nov 20, 2022 · Running mysqlcheck to Optimize Tables in a MySQL Database The following mysqlcheck database command optimizes all tables in all your MySQL databases. This process can be a lot faster, especially for large indexes which would get inserts in very random order Dec 16, 2011 · When trying to optimize the entire database using the mysqlcheck command 'mysqlcheck -o mysql' the below errors are returned. Sep 27, 2015 · Step 3. Aug 5, 2021 · Check a Table With mysqlcheck. PostgreSQLでは「vacuum」とSQLクエリに投げるだけで全テーブル最適化してくれたのですが、OPTIMIZE TABLEの場合はひとつひとつテーブル名を指定しなければならないのでPHPで作りました。. If the index pages are not sorted, sort them. But Why do you think you want to Optimize all the tables. The benefit of using mysqlcheck is that you do not have to stop the server to perform table maintenance. My database is 17 GB and I removed some large text fields from large tables, and I'm hoping to recover space because my OS is yelling at me to make more space. Repair MySQL databases on Ubuntu Linux Jan 12, 2016 · Using mysqlcheck command, we can optimize, repair and analyse the tables. . I never use MyISAM tables. my. mysqlcheck -o test -u root -p. It does nothing to help tables. Hits: 92 @randymelder - You are wrong to say mysqlcheck is a synonym for CHECK TABLE. Sep 18, 2021 · Based in Munich, our engineers & laboratory helps you to develop your product from the first idea to certification & production. sessions OK Aug 18, 2021 · Log out all agents. 0; MySQL ですべてのテーブルを OPTIMIZE する方法. mariadb-check and all-databases. Dec 19, 2008 · Where mysqlcheck is the command to check the database, root stands for root user, prompt for a password, check all databases, and auto-repair any corrupted tables. Here is a simple command to auto repair, check and optimize all the tables in all databases running on a MySQL server: mysqlcheck -u root -p --auto-repair --check --optimize --all-databases. so the question is: "How to run mysqlcheck and just get RELEVANT output"? The CHECK TABLE statement does not detect inconsistencies that affect only the header data. This will update and optimize the database. Type the following command, replacing DATABASE with the name of the database that you want to check: mysqlcheck DATABASE. The reason not todo so mysqlcheck unless needed would be that mysqlcheck acquires read locks on the database which prevents writes to the locked table as long as the read lock is held. mariadb-check and verbose. bat scripts. 2. 1. So, if you want to do both, you'll need 2 runs. But, obviously, this requires mysql service to run. For case when you have hundreds of databases; you can script this procedure like. mysqlcheck --optimize -A. --all-in-1 (-1) Instead of issuing one query for each table, use one query per database, naming all tables in the database in a comma-separated list. To perform the check: 1. It will show you some output e. But, normally, InnoDB takes care of itself, rarely leaving more than 50% of the disk footprint "free". May 09, 2011 05:03PM Don't OPTIMIZE. The mysqlcheck command is the command-line version of CHECK TABLE. 4 OPTIMIZE TABLE Statement. mysqlcheck --all-databases --optimize --skip-write-binlog . The program runs in the terminal while the MySQL service is operating. I never run mysqlcheck directly. If you want to have a tool that repairs tables by default, you should just make a copy of mysqlcheck named mysqlrepair, or make a symbolic link to mysqlcheck named mysqlrepair. 47. 5. Mar 12, 2020 · 5-To optimize the table, Check All to select all the tables and choose Optimize Table from the menu. Use the following command to perform the repair and optimization activities. g. mysqlcheck is a command-line interface for administrators to check, optimize and repair tables. 3. mysqlcheck -o The benefit of using mysqlcheck is that you do not have to stop the server to perform table maintenance. pt-online-schema-change D=database,t=table --alter "ENGINE=InnoDB". tc ft hb gz vn tw ek xe yp zy