What is the InnoDB log file?
InnoDB creates two 5MB redo log files named ib_logfile0 and ib_logfile1 in the data directory by default. The following options can be used to modify the default configuration: innodb_log_group_home_dir defines directory path to the InnoDB log files.
Where are InnoDB logs stored?
1 Answer. ls /var/lib/mysql/ did the job.
What is InnoDB redo log?
The InnoDB transaction log handles REDO logging, this is the mechanism that provides the A (Atomic) C (Consistent)Â and D (Durability) in ACID. The transaction log keeps a complete record of every change that occurs to the pages inside the database.
How do I edit InnoDB?
To change the number or size of InnoDB log files, perform the following steps:
- Stop the MySQL server and make sure that it shuts down without errors.
- Edit my. cnf to change the log file configuration. To change the log file size, configure innodb_log_file_size .
- Start the MySQL server again.
What is Redolog in MySQL?
The redo log is a disk-based data structure used during crash recovery to correct data written by incomplete transactions. During normal operations, the redo log encodes requests to change table data that result from SQL statements or low-level API calls.
How does InnoDB crash recovery happen?
To recover from an unexpected MySQL server exit, the only requirement is to restart the MySQL server. InnoDB automatically checks the logs and performs a roll-forward of the database to the present. InnoDB automatically rolls back uncommitted transactions that were present at the time of the crash.
Where is the log file for MySQL?
The default location for each of the logs is the MySQL Data directory (C:\ProgramData\MySQL\MySQL Server [version number]\Data\), and the default log names are based on the computer’s device name.
How do I lower ibdata1?
How to Shrink MySQL ibdata1 Size using innodb_file_per_table
- Big MySQL (and MariaDB) System Tablespace.
- Set the innodb_file_per_table parameter.
- New Tables (and index) as individual files.
- Extract existing tables from ibdata1.
- Shrink ibdata1 File Size.
- Backup the Database.
- Drop all your database.
- Delete ibdata and ib_logfile.
What is Innodb_thread_concurrency in MySQL?
The default value of innodb_thread_concurrency is 0 , so that by default there is no limit on the number of concurrently executing threads. InnoDB causes threads to sleep only when the number of concurrent threads is limited.
Can I delete ib_logfile0?
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.