Mysql Repair Table Error Corrupt
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Connectors More MySQL.com Downloads Developer Zone Section Menu: Documentation Home MySQL 5.7 Reference Manual Preface and Legal Notices General Information Installing and Upgrading MySQL Using MySQL as a Document Store Tutorial mysql repair table command MySQL Programs MySQL Server Administration Security Backup and Recovery Optimization Language Structure Globalization
Mysql Repair Table Innodb
Data Types Functions and Operators SQL Statement Syntax Data Definition Statements ALTER DATABASE Syntax ALTER EVENT Syntax ALTER FUNCTION
Mysql Repair Crashed Table
Syntax ALTER INSTANCE Syntax ALTER LOGFILE GROUP Syntax ALTER PROCEDURE Syntax ALTER SERVER Syntax ALTER TABLE Syntax ALTER TABLE Partition Operations ALTER TABLE Online Operations in MySQL Cluster ALTER TABLE and
Mysql Repair Table Example
Generated Columns ALTER TABLE Examples ALTER TABLESPACE Syntax ALTER VIEW Syntax CREATE DATABASE Syntax CREATE EVENT Syntax CREATE FUNCTION Syntax CREATE INDEX Syntax CREATE LOGFILE GROUP Syntax CREATE PROCEDURE and CREATE FUNCTION Syntax CREATE SERVER Syntax CREATE TABLE Syntax CREATE TABLE ... LIKE Syntax CREATE TABLE ... SELECT Syntax Using FOREIGN KEY Constraints Silent Column Specification Changes CREATE TABLE and Generated Columns mysql repair table syntax Secondary Indexes and Generated Virtual Columns Setting NDB_TABLE options in table comments CREATE TABLESPACE Syntax CREATE TRIGGER Syntax CREATE VIEW Syntax DROP DATABASE Syntax DROP EVENT Syntax DROP FUNCTION Syntax DROP INDEX Syntax DROP LOGFILE GROUP Syntax DROP PROCEDURE and DROP FUNCTION Syntax DROP SERVER Syntax DROP TABLE Syntax DROP TABLESPACE Syntax DROP TRIGGER Syntax DROP VIEW Syntax RENAME TABLE Syntax TRUNCATE TABLE Syntax Data Manipulation Statements CALL Syntax DELETE Syntax DO Syntax HANDLER Syntax INSERT Syntax INSERT ... SELECT Syntax INSERT DELAYED Syntax INSERT ... ON DUPLICATE KEY UPDATE Syntax LOAD DATA INFILE Syntax LOAD XML Syntax REPLACE Syntax SELECT Syntax SELECT ... INTO Syntax JOIN Syntax UNION Syntax Subquery Syntax The Subquery as Scalar Operand Comparisons Using Subqueries Subqueries with ANY, IN, or SOME Subqueries with ALL Row Subqueries Subqueries with EXISTS or NOT EXISTS Correlated Subqueries Subqueries in the FROM Clause Subquery Errors Optimizing Subqueries Rewriting Subqueries as Joins UPDATE Syntax Transactional and Locking Statements START TRANSACTION, COMMIT, and ROLLBACK Syntax Statements That Cannot Be Rolled Back Statements That Cause an Implicit Commit SAVEPOINT, ROLLBACK TO SAVEPOINT, and RELEASE SAVEPOINT Syntax LOCK T
Connectors More MySQL.com Downloads Developer Zone Section Menu: Documentation Home MySQL 5.7 Reference Manual Preface repair table phpmyadmin and Legal Notices General Information Installing and Upgrading MySQL myisamchk repair Using MySQL as a Document Store Tutorial MySQL Programs MySQL Server Administration Security Backup the storage engine for the table doesn't support repair and Recovery Backup and Recovery Types Database Backup Methods Example Backup and Recovery Strategy Establishing a Backup Policy Using Backups for Recovery Backup http://dev.mysql.com/doc/en/repair-table.html Strategy Summary Using mysqldump for Backups Dumping Data in SQL Format with mysqldump Reloading SQL-Format Backups Dumping Data in Delimited-Text Format with mysqldump Reloading Delimited-Text Format Backups mysqldump Tips Making a Copy of a Database Copy a Database from one Server to Another Dumping Stored Programs https://dev.mysql.com/doc/refman/5.7/en/myisam-repair.html Dumping Table Definitions and Content Separately Using mysqldump to Test for Upgrade Incompatibilities Point-in-Time (Incremental) Recovery Using the Binary Log Point-in-Time Recovery Using Event Times Point-in-Time Recovery Using Event Positions MyISAM Table Maintenance and Crash Recovery Using myisamchk for Crash Recovery How to Check MyISAM Tables for Errors How to Repair MyISAM Tables MyISAM Table Optimization Setting Up a MyISAM Table Maintenance Schedule Optimization Language Structure Globalization Data Types Functions and Operators SQL Statement Syntax The InnoDB Storage Engine Alternative Storage Engines High Availability and Scalability Replication MySQL Cluster NDB 7.5 Partitioning Stored Programs and Views INFORMATION_SCHEMA Tables MySQL Performance Schema MySQL sys Schema Connectors and APIs Extending MySQL MySQL Enterprise Edition MySQL Workbench MySQL 5.7 Frequently Asked Questions Errors, Error Codes, and Common Problems Restrictions and Limits Indexes MySQL Glossary Related Documentation MySQL 5.7 Release N
very easily. In this article, I'll explain how to use myisamchk to identify and http://www.thegeekstuff.com/2008/09/how-to-repair-corrupted-mysql-tables-using-myisamchk/ fix table corruption in MyISAM. When a table is created under MySQL, it creates three different files: *.frm file to store table format, *.MYD (MyData) https://twindb.com/repair-corrupted-innodb-table-with-corruption-in-secondary-index/ file to store the data, and *.MYI (MyIndex) to store the index. I prefer to use InnoDB as the storage engine for bigger database, as it mysql repair resembles Oracle and provides commit, rollback options. I got the following error from a production bugzilla application that is using MySQL database. From the error message, it is clear that attach_data table is corrupted and needs to be reparied. The corrupted table can be repaired using myisamchk as explained below. undef error mysql repair table - DBD::mysql::db selectrow_array failed: Table 'attach_data' is marked as crashed and should be repaired [for Statement "SELECT LENGTH(thedata) FROM attach_data WHERE id = ?"] at Bugzilla/Attachment.pm line 344 Bugzilla::Attachment::datasize('Bugzilla::Attachment=HASH(0x9df119c)') called 1. Identify all corrupted tables using myisamchk # myisamchk /var/lib/mysql/bugs/*.MYI >> /tmp/myisamchk_log.txt myisamchk: error: Wrong bytesec: 0-0-0 at linkstart: 18361936 MyISAM-table 'attach_data.MYI' is corrupted Fix it using switch "-r" or "-o" myisamchk: warning: 1 client is using or hasn't closed the table properly MyISAM-table 'groups.MYI' is usable but should be fixed myisamchk: warning: 1 client is using or hasn't closed the table properly MyISAM-table 'profiles.MYI' is usable but should be fixed When you redirect the output of myisamchk to a temporary file, it will display only the corrupted table names on the screen. The /tmp/myisamchk_log.txt file will contain information about all the tables including the good ones, as shown below: Checking MyISAM file: user_group_map.MYI Data records: 182 Deleted blocks: 0 - check
Mac OS TwinDB Software Repository Services MySQL Backup Service MySQL Data Recovery Service What our customers say Questions Contact Us Home Backup and Data Recovery for MySQL MySQL Data Recovery Repair Corrupted InnoDB Table with Corruption in Secondary Index Repair Corrupted InnoDB Table with Corruption in Secondary Index By Aleksandr Kuzminsky/on July 27, 2014/in MySQL Data Recovery/ tags corrupted secondary index, corrupted table, innochecksum_changer UPDATE: We announced online data recovery from corrupt databases. Check it out on https://recovery.twindb.com/ InnoDB provides no means to repair corrupted table space. Once a table got corrupt the only way to repair MySQL files is to start it with innodb_force_recovery={4,5,6} in hope that you can dump the table, so you can rebuild the table space from scratch. At least this is what the manual says. But let's take a closer look at InnoDB corruption. In some case you can repair InnoDB table space much faster. UPDATE: If corruption is in PRIMARY index check post Recover Corrupt MySQL Database What InnoDB provides to repair tablespace corruption InnoDB doesn't let you repair the table space, but you can rebuild secondary indexes with ALTER TABLE DROP/ADD KEY. That may be very useful in case corruption malformed pages where secondary index is stored. So, before starting a whole story with innodb_force_recovery, dump, drop, create and reload a table check the MySQL error log. Who knows, maybe it can give clues how repair the table space without rebuilding it from scratch. Check where the corruption is Let me illustrate my point. As usually we will work with actor table from sakila database. It has secondary key on last_name which is good for our case: MySQL CREATE TABLE `actor` ( `actor_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT, `first_name` varchar(45) NOT NULL, `last_name` varchar(45) NOT NULL, `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`actor_id`), KEY `idx_actor_last_name` (`last_name`) ) ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8; 12345678 CREATE TABLE `actor` (`actor_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,`first_name` varchar(45) NOT NULL,`last_name` varchar(45) NOT NULL,`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,PRIMARY KEY (`actor_id`),KEY `idx_actor_last_name` (`last_name`)) ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8; So I went ahead and did some modifications in one page of the secondary index idx_actor_last_name. Any access to the index will lead to checksum test failure which is enough for InnoDB to c