Rebuild or repair a MySQL table or index
# Table and index changes refer to the way MySQL handles data types and character sets. CHECK TABLE, mysqlcheck, or mysql_upgrade reports necessary table repairs or upgrades.
Rebuild the table
There are many ways to rebuild the table. Some of these methods are listed below -
Dump and Reload Method
ALTER TABLE Method
-
Repair Table Methods
Let us briefly understand them -
Dump and Reload Method
If due to different version of MySQL version This dump and reload method is required when a table cannot be processed after a binary (in-place) upgrade or download and the table needs to be rebuilt.
Tables can be rebuilt by dumping and reloading. This can be done by using "mysqldump" and creating a dump file and allowing mysql to reload the file. This can be done using the following command -
mysqldump db_name t1 > dump.sql mysql db_name < dump.sql
If all tables have to be rebuilt in a single database, you can specify the database name without using any table name. This can be done using the following command -
mysqldump db_name > dump.sql mysql db_name < dump.sql
If all tables in all databases have to be rebuilt, the "--all databases" option must be used. This can be done using the following command -
mysqldump --all-databases > dump.sql mysql < dump.sql
ALTER TABLE method
If you need to rebuild the table using the ALTER TABLE method, you can use the "null" change. You can use the ALTER TABLE statement to alter a table so that it can use the storage engine. Let us take an example: Suppose TblName is an InnoDB table, the following statement can be used to rebuild the table -
ALTER TABLE TblName ENGINE = InnoDB;
REPAIR TABLE method
REPAIR TABLE method is only available for MyISAM, ARCHIVE and CSV tables . If a table check operation indicates that the file is corrupted or needs to be upgraded, you can use the statement REPAIR TABLE. Let us take an example: To repair a MyISAM table, the following statement can be executed -
REPAIR TABLE TblName;
mysqlcheck --repair Provides command line access to the REPAIR TABLE statement. This may be a more convenient way to repair tables, as you can use --databases to repair specific tables in a database, or the --all-databases option to repair all tables in all databases. This can be done using the following command -
mysqlcheck −−repair −−databases db_name ... mysqlcheck −−repair −−all−databases
The above is the detailed content of Rebuild or repair a MySQL table or index. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

This article explores optimizing MySQL memory usage in Docker. It discusses monitoring techniques (Docker stats, Performance Schema, external tools) and configuration strategies. These include Docker memory limits, swapping, and cgroups, alongside

This article addresses MySQL's "unable to open shared library" error. The issue stems from MySQL's inability to locate necessary shared libraries (.so/.dll files). Solutions involve verifying library installation via the system's package m

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

This article compares installing MySQL on Linux directly versus using Podman containers, with/without phpMyAdmin. It details installation steps for each method, emphasizing Podman's advantages in isolation, portability, and reproducibility, but also

This article provides a comprehensive overview of SQLite, a self-contained, serverless relational database. It details SQLite's advantages (simplicity, portability, ease of use) and disadvantages (concurrency limitations, scalability challenges). C

This guide demonstrates installing and managing multiple MySQL versions on macOS using Homebrew. It emphasizes using Homebrew to isolate installations, preventing conflicts. The article details installation, starting/stopping services, and best pra

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]
