Home >Database >Mysql Tutorial >Why Doesn't MySQL InnoDB Release Disk Space After Data Deletion, and How Can I Reclaim It?
Insufficient Disk Space Release After MySQL InnoDB Data Deletion
MySQL's InnoDB storage engine is known for not automatically releasing allocated disk space when data rows are deleted from a table. This behavior is due to the nature of InnoDB's row-based storage model. When a row is deleted, the space it occupied is not immediately freed but marked as available for reuse by future inserts or table extensions.
Consequently, even after deleting data rows and performing optimization commands like OPTIMIZE TABLE, the size of the InnoDB's shared tablespace file, typically named ibdata1, may remain the same. This can lead to low disk space issues, especially in environments with numerous tables and frequent data deletion operations.
To resolve this issue, users have two main options:
innodb_data_file_path = ibdata1:10M # shrink to 10 MB
This process will create a new ibdata1 file with the reduced size specified, while preserving the data from the original database. Keep in mind that this method may require additional disk space during the restore process.
The above is the detailed content of Why Doesn't MySQL InnoDB Release Disk Space After Data Deletion, and How Can I Reclaim It?. For more information, please follow other related articles on the PHP Chinese website!