Friday, February 24, 2012

MySQL Recovery to Fix Error 145 in Database

Every MyISAM table is stored in three kind of files, these are .frm, .myd, .myi, stand for table format, data, and indexes. These files may become corrupt due http://www.blogger.com/img/blank.gifto system failure, when MyISAM table not closed properly, that generate unnecessary circumstance of table corruption. In these condition there may arise error and then we can solve that by using recover MySQL Database.

Now, take an example where you are creating a MySQL database that saved at its default location MyISAM. But, All of sudden there occur a error message that is following.

“MySQL error code 145 = Table was marked as crashed and should be repaired.”

The error may arise when we tried to access data’s from corrupted tables. To fix this error you should use proper tools.

Mostly, this error can be easily solved using database repair utilities, but first of all we should check the integrity of the database. For that, you have to follow the following steps.

First check that server is running on which table is stored.
Run the following command for check table consistency:

myisamchk table_name

Where, table_name refers to the name of table to be checked

If the table is reported as corrupt, repair it using the below command:
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myisamchk -r -q table_name

This is a quick recovery modet to repair only the indexes of table. If this doesn't work, execute the below command.

myisamchk -r table_name

This command will delete the affected rows that make the table useless. Though, it is necessary to create backup of your database to repair MySQL database. For safe MySQL database recovery, you need to additional utilities that can secure to your database to repair corrupted database.

Stellar Phoenix Database Recovery for MySQL is a tool that is used for repair MySQL database. This harmless tool can be used for both MyISAM and InnoDB database file repair.

Wednesday, June 15, 2011

MySQL Repair to Fix Tables Corrupted After Delete Operation

MySQL database stores all your precious data in the form of tables. The database storage is managed by two major storage engines- MyISAM and InnoDB. Both these engines offer advanced features to manage the database. MySQL database management commands include ‘Delete’ operation. This statement enables you to delete selected or all rows from a table. It also provides the total number of rows that are deleted. Howerver, under some circumstances, the MySQL database may get corrupted after this operation and put you in need of MySQL recovery solutions.

The first and foremost thing for the edit operations on your MySQL database is that you must have sufficient privileges to do it. Delete operation on the database is pretty safe if you are doing it properly. But there are some situations where your MySQL database may give you strange errors when you attempt to access the database after running Delete statement. This behavior makes your significant data inaccessible and lead to critical data loss.

For a real life example of this problem with your MySQL database, you may encounter the below error message when you run the Delete query on your database:

“InnoDB: Failing assertion: fil_page_get_type(page) == FIL_PAGE_TYPE_BLOB...”

The delete statment fails to work after this error message. Along with that, all the records of MySQL table become unusable. In such situations, you have to find out the reason of this issue and fix it using MySQL repair solutions.

Root of the problem:

You may encounter this behavior of MySQL database management system due to any of the following reasons:

• The MySQL server installation is faulty.
• There is a buggy BLOB handling in MySQL database.

Solution:

In order to sort out this problem with MySQL database, you can try the following MySQL recovery solutions:

• Run CHECK TABLE and REPAIR TABLE commands on affected table.
• Restore database from valid backup.
• Use third party MySQL database repair applications.

The commercial software are very useful in all corruption scenarios. They help you repair and restore corrupted database extremely effectively. Such applications restore all database objects, including tables, reports, forms, stored procedures, and triggers. They works well with databases created using both InnoDB and MyISAM storage engines.


1. Run check table on corrupt table
2. Then run repair table command on that table
3. Try and re-run the Delete command.

There is still a slight possibility that your table still remains corrupted after following the above steps. For successful and complete repairing of table, you will need to use an advanced MySQL Database Repair software. Such tools use powerful repairing methods to provide absolute MySQL Repair in all situations. With interactive user-interface, these tools are easy-to-understand without any prior technical knowledge. These non destructive tools ensure safe repair of database without making any changes in the original MySQL database.

Stellar Phoenix Database Recovery For MySQL is a proficient MySQL Database Repair software to repair damaged databases built in MyISAM and InnoDB MySQL database storage engines. The repair tool recovers and restores MySQL database components (tables, primary key(s), and relations, etc.) on default or new user-specified location. It is compatible with Windows Vista, XP, 2003 and 2000.

Monday, April 25, 2011

Repair MySQL Database to Resolve “Record was already deleted” Error

MySQL is a fast and reliable Relational Database Management System (RDBMS), which stores all your precious data in the form of tables. MySQL tables are very easy to manage and access. Tables enable you to store your significant data in orderly fashion (in form of rows and columns). However, under some situations, you may run across performance issues with the MySQL tables. In such situations, you need to go for MySQL Repair solutions.

You have to always specify the type of table before you enter actual records in the table. But there are some situations where you may find the decreased performance of queries and errors when you try to access the tables. This behavior most probably occurs due to corruption to the table. Table corruption may be the outcome of unexpected system shutdown, application malfunction, virus infection, hard drive errors, and unexpected locking of the tables.

For a real life example of this problem with MySQL database table, you may encounter the following error message while accessing a MySQL table:

“Record was already deleted (or record file crashed)”

This error occurs even if the record is there, but MySQL application is unable to recognize it. At this point, you have to find out the main cause of the problem and then repair MySQL database by fixing it.

Root of the problem:

The major reason of this problem is corruption of the MySQL table. Corruption occurs due to virus infection, application malfunction, improper system shutdown, and other similar reasons.

Resolution:

Try any of the below MySQL repair solutions to fix this problem:

• Log into the MySQL as an administrator.
• Use the CHECK TABLE command to make sure the problem is caused by table corruption.
• If corruption is reported, then use REPAIR TABLE command, which is an inbuilt solution to repair MySQL database.
• If you fail to recover MySQL database using any of the above methods, then you have to restore data from an updated backup.
• In case, backup is not available, MySQL recovery software come for your help.

These are effective third-party applications that help you repair and restore a damaged database in all cases of corruption. They offer absolute recovery using advanced scanning and recovery algorithms. Such applications are useful with MySQL 6.x, 5.x, 4.x, and 3.x versions. One of the most powerful MySQL database recovery software is Stellar Phoenix Database Recovery for MySQL.

Tuesday, April 19, 2011

Repair MySQL Database to Handle MYI File Corruption

MySQL is a comprehensive and efficient Relational Database Management System (RDBMS), which manages your data effectively using the storage engines. There are two major Storage Engines used by MySQL- MyISAM and InnoDB. In most of the MySQL versions, MyISAM is the standard storage engine that uses older ISAM code as a base. Sometimes, MySQL can not open the files of the MyISAM storage engine and you run across data loss. The problem can be due to corruption to the database and put you in need of MySQL Repair solutions.

The MyISAM tables are made up of several files, such as .MYI (MyIndex), .MYD, and .frm files. The MYI is the index file of MyISAM that is used to store the table indexes. However, there are some situations where MySQL can not open the Index file. The most probable reason of this behavior can be corruption to this file. It leads to severe data loss problems and thus you have to repair MySQL database using -advanced MySQL recovery techniques.

As an example of this problem with your MySQL database, you may encounter the below error message while accessing data from the database:

“can't find file: .MYI”

At this point of time, it becomes essential to find out the actual cause of the problem and sort it out using MySQL repair tools.

Root of the problem:

As sated in the above error message, the problem occurs due to corruption to the MYI file. MySQL Index file corruption may be the outcome of unexpected system shutdown, application malfunction, virus infection, improper editing of the database, and more.

Resolution:

You can Repair MySQL Database in such situations using any of the following methods:

• Check database corruption using inbuilt MySQL commands, like CHECK TABLE, myisamchk, and mysqlcheck.
• If corruption is detected, using REPAIR TABLE command to fix it.
• In case problem persists, restore MySQL database from recent backup.
• When all else fail, use third-party MySQL recovery software to repair and restore the database.

Such applications are very handle to effectively fix database corruption in all scenarios. They have pretty simple graphical user interface to offer easy recovery. One of the most popular MySQL recovery software is Stellar Phoenix Database Recovery for MySQL. It works well with both MyISAM and InnoDB storage engines.

Tuesday, April 5, 2011

MySQL Repair to Fix Storage Engine Corruption

MySQL is a popular and effective Relational Database Management System (RDBMS), mainly used for websites. It uses storage engines to effectively store your business-critical data. They play an important role in efficient storage and wonderful accessibility of data. The major storage engines of MySQL database are InnoDB and MyISAM. If storage engine faces any issues like corruption, database become inaccessible and data loss occurs. In such critical situations, you need to opt for MySQL repair solutions.

Storage engine, like InnoDB is a standard component of the database. It uses a number of libraries to manage your precious data. However, there are some situations where you find that your database become inaccessible due to storage engine corruption. In a practical example of this problem, you may run across the below error message when this issue occurs-

“Uncategorized SQLException for SQL []; SQL state [HY000]; error code [1030]; Got error 134 from storage engine; nested exception is java.sql.SQLException: Got error 134 from storage engine”

Your MySQL database become unusable and inaccessible when you encounter this error. When you face this problem, you need to identify the actual cause of this issue and repair MySQL database using appropriate tools.

Grounds of the problem-

As stated above in the error message, this behavior usually occurs due corruption to the InnoDB storage engine. InnoDB is a significant part of MySQL database and must be in working state to access your data. The corruption may occur due to a wide range of reasons, such as-

  • Infection of malicious programs like viruses.
  • Improper system shutdown or application malfunction.
  • MySQL application crash.
  • Improper editing of the database.

Resolution-

You can try any of the below methods to repair MySQL data in such situations-

  • Try inbuilt queries to fix the corruption.
  • Restore database from a complete backup.
  • Use third-party MySQL repair software to extract inaccessible data from the database.

MySQL recovery tools are capable of performing in-depth scan of whole database and recovering all inaccessible data from it. They come equipped with highly interactive and rich graphical user interface to offer easy recovery. The database recovery software do not alter original content as of their read-only conduct.

Tuesday, August 24, 2010

How to Recover Corrupt MySQL Database When the Wtlicensemanager DLL File is Missing

MySQL is an open source database that is used as a means for enterprise solutions. It is widely used in various high-traffic Web applications such as Flickr, Nokia, Google, etc. One such application is Webtrends Analytics that keeps track of the user behavior on certain websites as well as on mobiles that run operating systems. However, sometimes the MySQL database do get corrupt because of various reasons such as abrupt shutdown while the database is open, virus infections, hardware malfunctioning, human errors, etc. In such cases, you should try to repair MySQL database using in-built methods. If you are unable to repair MySQL file, then you should use a third-party MySQL recovery software to recover MySQL database.

Consider a scenario wherein you have installed Webtrends Analytics in your organization to track and analyze the traffic coming in your official website. You are using MySQL as backend for the application. One day, there is a power outage and there is abrupt system shutdown. You open the system after when power is restored, but you are unable to unable to access the application. An error message is displayed, that is:
"Could not find file wtlicensemanager.dll."

Cause
The root cause for this erroneous situation is that the database table has corrupted because of abrupt system shutdown.

Resolution
To resolve this situation, you should check the state of the backup. If the backup is clean and update, you should straightaway restore the database from the backup. If not, then you should perform the following steps to repair MySQL database:

Log into the MySQL database as administrator.

Type the password, if asked to do so. To do this, type the command:
mysql-u Administrator-p

Repair the table with the following command:
Use wtmaster

REPAIR TABLE table_name:
Where, wtmaster is the name of the database.

Exit the database by typing exit and pressing the Enter key.

Try to access the database as it the error would have been resolved by now. However, if you still are getting the same error message then you should use a third-party repair mysql software to restore the corrupted database. Such MySQL recovery tools are able to restore the database without overwriting the original data.

Database Recovery for MySQL is a MySQL repair software that enables you to mysql repair database from all instances of corruption. It supports the recovery of various files such as .ibdata, .ibd, .frm, .myd, .myi, and .frm in the MyISAM and InnoDB engines. This mysql database repair tool is able to repair MySQL files and related objects such as tables, views, etc. It recovers the databases created in MySQL 4.x and 5.x versions. This tool is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

Friday, June 4, 2010

Resolving 'The log sequence number in ibdata files does not match' Error

When using InnoDB storage engine, the ibdata files serve as system tablespace containers. Along with internal system information, these files might also contain user indexes and data. If any of these file(s) get corrupt, the entire database can go inaccessible. The article mentions one of such possible scenarios and then solutions that can help you to Repair MySQL Database.

For more clarification, consider a case when a server running MySQL on InnoDB engine undergoes unexpected power outage. After this, when you attempt to start the MySQL database, it might not run and behave abruptly. On viewing the log report for the behavior, you observe the following entries along with the related time stamps and server name:

“InnoDB:The log sequence number in ibdata files does not match
InnoDB:The log sequence number in the ib_logfiles!
InnoDB: Database was not shut down normally
InnoDB:Starting crash recovery.
InnoDB:Reading tablespace information from the .ibd files...
InnoDB:Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
InnoDB: Page directory corruption: supremum not pointed to..”

The above symptoms indicate table corruption in MySQL database, which might have occurred due to last unexpected power failure. More specifically, the ibdata file(s) have gone damaged.

Solution

If you encounter above stated or similar problems, try one of the suitable methods to solve it:
  • Check for the last available backup and restore your database.
  • In case backup is incomplete, try to repair the database using 'innodb_force_recovery = 4' repair command. However, the command may fail if extent of corruption is high.
  • If Innodb repair command has failed, you can delete the ibdata tablespace and recreate it after shutting down the server, if possible. Alternatively, you can rename the ibdata and the ib_log files. But doing so causes data loss. If this is not a suitable method, try the next solution.
  • To repair the corrupt MySQL database, use a third-party MySQL Repair utility. These are special tools that can Repair MySQL Database by running the most effective and safe scanning algorithms. Since they are equipped with an interactive design, any user, even with no technical knowledge, can use them easily.
Recovery For MySQL is a high-end tool that can repair both InnoDB and MyISAM databases. The MySQL database repair utility can recover both Windows and Linux stored database. Supporting MySQL 5.x and 4.x, this read-only tool maintains the original integrity of database because of non-destructive scanning algorithms.

Resource Link: http://ezinearticles.com/?Resolving-The-Log-Sequence-Number-in-Ibdata-Files-Does-Not-Match-Error&id=4392345