The ib_logfile* files are needed for InnoDB crash recovery. If you shut down InnoDB cleanly, you can remove them and change their size in the configuration file. Of course, you should be careful when doing such changes.
What is MySQL ib_logfile0?
The redo log is a disk-based data structure used during crash recovery to correct data written by incomplete transactions. … By default, the redo log is physically represented on disk by two files named ib_logfile0 and ib_logfile1 . MySQL writes to the redo log files in a circular fashion.
Why is ibdata1 so big?
When you delete innodb tables, MySQL does not free the space inside the ibdata file, that’s why it keeps growing. These files hardly ever shrink.
What is the use of ibdata1 file in MySQL?
The file ibdata1 is the system tablespace for the InnoDB infrastructure. You can separate Data and Index Pages from ibdata1 by enabling innodb_file_per_table. This will cause any newly created InnoDB table to store data and index pages in an external . ibd file.
How do I reduce InnoDB file size?
Decreasing the Size of the InnoDB System Tablespace
- Use mysqldump to dump all of your InnoDB tables, including InnoDB tables located in the mysql schema. …
- Stop the server.
- Remove all of the existing tablespace files ( *. …
- Remove any . …
- Configure the data files for the new system tablespace. …
- Restart the server.
Is it safe to remove Ib_logfile?
The ib_logfile* files are needed for InnoDB crash recovery. If you shut down InnoDB cleanly, you can remove them and change their size in the configuration file. Of course, you should be careful when doing such changes. It is best to take backups first.
What is IB files in MySQL?
The file ibdata1 is the system tablespace for the InnoDB infrastructure. It contains several classes for information vital for InnoDB. Table Data Pages.
Can I delete Ibtmp1?
In mysql 5.7 and higher all you need to do to reclaim the space used by the ibtmp1 file is restart the service. You do not have to set GLOBAL innodb_fast_shutdown = 0; or manually delete the file.
What is stored in ibdata1?
The single ibdata1 file contains all the tables and indexes in your MySQL database. So, if you have a big database, this file size will grow really big.
How do I dump all MySQL databases?
To create a backup of all MySQL server databases, run the following command:
- mysqldump –user root –password –all-databases > all-databases.sql. …
- mysql –user root –password mysql < all-databases.sql. …
- mysql –user root –password [db_name] < [db_name].sql. …
- select @@datadir;
Why is the ibdata1 file continuously growing in MySQL?
When the ibdata1 file is growing too fast within MySQL it is usually caused by a long-running transaction that we have forgotten about. … Our MySQL Monitoring Plugins includes a Nagios script that can alert you if it finds a too old running transaction.
How do I recover files from ibdata1?
Note: Make sure that the ib_logfile0 file size must be same as the ib_logfile1 file.
- Now copy the ibdata files to the MySQL data directory: cp –r /new/ibdata* /var/lib/mysql/
- Inside the new MySQL datadir, create an empty folder. …
- Start your MySQL server again: service mysqld restart.
How do you fix ibdata1?
STEPS TO BE FOLLOWED
- In mysqld section of my. cnf add a line innodb_force_recovery = 4 and then restart MySQL server using /etc/init. d/mysql restart .
- Take backup.
- Restore it on other server and verify the contents.
Does MySQL delete free space?
MySQL doesn’t reduce the size of ibdata1. Ever. Even if you use optimize table to free the space used from deleted records, it will reuse it later. An alternative is to configure the server to use innodb_file_per_table , but this will require a backup, drop database and restore.
How do I shrink a MySQL database file?
3. Shrink the ibdata File
- Stop the MySQL service on the primary Gateway: service mysql stop.
- Remove the existing ibdata files: rm -rf /var/lib/mysql/ib*
- Start the MySQL service on the primary Gateway: service mysql start.
- Extract the contents of the primary Gateway database backup:gzip -d /root/ibdata-shrink-backup.sql.gz.
What does MySQL optimize table do?
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. … After doing substantial insert, update, or delete operations on columns that are part of a FULLTEXT index in an InnoDB table.