Reclaiming Disk Space from MySQL InnoDB after Deleting Data Rows
Encountering a situation where MySQL InnoDB does not relinquish disk space after deleting data rows can be concerning, especially when faced with disk space constraints in multiple locations. To address this issue, let's explore why disk space might not be released and potential solutions to reclaim it.
Why InnoDB Retains Disk Space
In MySQL, the InnoDB storage engine utilizes a pooled tablespace, which assigns disk space dynamically. Unlike other storage engines that allocate space for specific files, InnoDB stores data in a single file (ibdata1), making it more efficient for concurrent operations. However, this approach also means that deleted data is not physically removed but marked as free.
Releasing Disk Space
Unfortunately, MySQL does not automatically reduce the size of ibdata1 when space is freed. However, there are two approaches to reclaim disk space:
Considerations
Before taking action, consider the following:
By understanding how InnoDB handles disk space and implementing the appropriate solution, you can reclaim valuable disk space and ensure optimal performance for your MySQL databases.
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