How data files are managed in InnoDB?
In InnoDB, data files are managed using a combination of data dictionary tables and system tablespace files.
- Data dictionary tables: InnoDB stores metadata about the database, such as table and index definitions, in data dictionary tables. These tables are stored in the InnoDB system tablespace, which is a shared tablespace that contains the InnoDB data dictionary and other system-level information.
- System tablespace files: InnoDB stores all the data in tables and indexes, as well as undo logs, in system tablespace files. The system tablespace files are typically located in the MySQL data directory, and are named ibdata1, ibdata2, etc.
- Additional tablespaces: InnoDB also supports creating additional tablespaces, which allows for separating different tables and indexes into different files. This can be useful for managing large tables, spreading I/O across multiple disks, or for backup and recovery purposes.
- File-per-table: This is another feature of InnoDB which allows you to store the data and indexes of individual tables in separate files, rather than in the shared system tablespace. This can be useful for managing large tables, spreading I/O across multiple disks, or for backup and recovery purposes.
# function to get disk I/O statistics
disk_io_counters = psutil.disk_io_counters()
return (disk_io_counters.read_bytes, disk_io_counters.write_bytes)
# function to print disk I/O statistics
read_bytes, write_bytes = get_disk_io_stats()
print("Read bytes: ", read_bytes)
print("Write bytes: ", write_bytes)
# set the interval to monitor disk I/O
interval = 5