Database
Mysql Tutorial
Detailed explanation of MySQL table data file corruption causing the database to fail to start
Detailed explanation of MySQL table data file corruption causing the database to fail to start
1. Problem log
2017-08-31 14:18:05 4122 [Note] InnoDB: Database was not shutdown normally! 2017-08-31 14:18:05 4122 [Note] InnoDB: Starting crash recovery. 2017-08-31 14:18:05 4122 [Note] InnoDB: Reading tablespace information from the .ibd files... 2017-08-31 14:18:05 4122 [ERROR] InnoDB: Attempted to open a previously opened tablespace. Previous tablespace dev/tb_test uses spac e ID: 1 at filepath: ./dev/tb_test.ibd. Cannot open tablespace mysql/innodb_table_stats which uses space ID: 1 at filepath: ./mysql/ innodb_table_stats.ibd 2017-08-31 14:18:05 2ad861898590 InnoDB: Operating system error number 2 in a file operation. InnoDB: The error means the system cannot find the path specified. InnoDB: If you are installing InnoDB, remember that you must create InnoDB: directories yourself, InnoDB does not create them. InnoDB: Error: could not open single-table tablespace file ./mysql/innodb_table_stats.ibd InnoDB: We do not continue the crash recovery, because the table may becomeInnoDB: corrupt if we cannot apply the log records in the InnoDB log to it. InnoDB: To fix the problem and start mysqld: InnoDB: 1) If there is a permission problem in the file and mysqld cannot InnoDB: open the file, you should modify the permissions. InnoDB: 2) If the table is not needed, or you can restore it from a backup, InnoDB: then you can remove the .ibd file, and InnoDB will do a normal InnoDB: crash recovery and ignore that table. InnoDB: 3) If the file system or the disk is broken, and you cannot remove InnoDB: the .ibd file, you can set innodb_force_recovery > 0 in my.cnf InnoDB: and force InnoDB to continue crash recovery here. 150126 14:18:06 mysqld_safe mysqld from pid file /home/mysql/mysql_app/dbdata/liuyazhuang136.pid ended
2. Solution
1. Add the following parameters to my.cnf
Add to the [mysqld] group:
innodb_force_recovery=6
innodb_force_recovery parameter explanation:
innodb_force_recovery affects the recovery status of the entire InnoDB storage engine. The default value is 0, which means that all recovery operations are performed when recovery is required.
When effective recovery operations cannot be performed, mysql may not be able to start and an error log will be recorded.
innodb_force_recovery can be set to 1-6, the larger number includes the impact of all previous numbers.
When the parameter value is greater than 0, select, create, and drop operations can be performed on the table, but operations such as insert, update, or delete are not allowed.
1(SRV_FORCE_IGNORE_CORRUPT): Ignore the detected corrupt page
2(SRV_FORCE_NO_BACKGROUND): Prevent the main thread from running. If the main thread needs to perform a full purge operation, it will cause a crash
3(SRV_FORCE_NO_TRX_UNDO): Do not execute Transaction rollback operation.
4(SRV_FORCE_NO_IBUF_MERGE): Do not perform the merge operation of insert buffer.
5(SRV_FORCE_NO_UNDO_LOG_SCAN): Without checking the redo log, the InnoDB storage engine will treat uncommitted transactions as committed.
6(SRV_FORCE_NO_LOG_REDO): Do not perform rollforward operation.
2.Back up the database
$mysqldump -h 192.168.209.136 -uroot -p dev > /home/mysql/dev.sql
3.Delete the database
$mysql -h 192.168.209.136 -uroot -p mysql> drop database dev; ERROR 1051 (42S02): Unknown table 'dev.tb_test'
Physically delete the frm and ibd files corresponding to tb_test
mysql> drop database dev; Query OK, 0 rows affected (0.00 sec)
4.Create Database
mysql> create database dev; Query OK, 1 row affected (0.03 sec)
5. Remove the parameter innodb_force_recovery
After removing the previously set parameters, restart the database
##innodb_force_recovery=6
6. Import data
[mysql@liuyazhuang136 dev]$ mysql -h 192.168.209.136 -uroot -pmysql dev</home/mysql/dev.sql Warning: Using a password on the command line interface can be insecure. ERROR 1050 (42S01) at line 25: Table '`dev`.`tb_test`' already exists
Prompt table Already exists. This is because after removing the innodb_force_recovery parameter, the database will be rolled back and the corresponding ibd file will be generated. Therefore, the file needs to be deleted.
Re-import after deletion
[mysql@liuyazhuang136 dev]$ mysql -h 192.168.209.136 -uroot -pmysql dev</home/mysql/dev.sql
The above is the detailed content of Detailed explanation of MySQL table data file corruption causing the database to fail to start. 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
1385
52
MySQL: Simple Concepts for Easy Learning
Apr 10, 2025 am 09:29 AM
MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.
How to open phpmyadmin
Apr 10, 2025 pm 10:51 PM
You can open phpMyAdmin through the following steps: 1. Log in to the website control panel; 2. Find and click the phpMyAdmin icon; 3. Enter MySQL credentials; 4. Click "Login".
MySQL: An Introduction to the World's Most Popular Database
Apr 12, 2025 am 12:18 AM
MySQL is an open source relational database management system, mainly used to store and retrieve data quickly and reliably. Its working principle includes client requests, query resolution, execution of queries and return results. Examples of usage include creating tables, inserting and querying data, and advanced features such as JOIN operations. Common errors involve SQL syntax, data types, and permissions, and optimization suggestions include the use of indexes, optimized queries, and partitioning of tables.
Why Use MySQL? Benefits and Advantages
Apr 12, 2025 am 12:17 AM
MySQL is chosen for its performance, reliability, ease of use, and community support. 1.MySQL provides efficient data storage and retrieval functions, supporting multiple data types and advanced query operations. 2. Adopt client-server architecture and multiple storage engines to support transaction and query optimization. 3. Easy to use, supports a variety of operating systems and programming languages. 4. Have strong community support and provide rich resources and solutions.
How to use single threaded redis
Apr 10, 2025 pm 07:12 PM
Redis uses a single threaded architecture to provide high performance, simplicity, and consistency. It utilizes I/O multiplexing, event loops, non-blocking I/O, and shared memory to improve concurrency, but with limitations of concurrency limitations, single point of failure, and unsuitable for write-intensive workloads.
MySQL and SQL: Essential Skills for Developers
Apr 10, 2025 am 09:30 AM
MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.
MySQL's Place: Databases and Programming
Apr 13, 2025 am 12:18 AM
MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen
How to build a SQL database
Apr 09, 2025 pm 04:24 PM
Building an SQL database involves 10 steps: selecting DBMS; installing DBMS; creating a database; creating a table; inserting data; retrieving data; updating data; deleting data; managing users; backing up the database.


