InnoDB system tablespace contains the doublewrite buffer and the change buffer.
• Each database (including the mysql system database) has a single directory under the
data directory that contains storage-engine specific data files for the database.
– For example: tablename.ibd for InnoDB, which contains the table data and
metadata
In previous MySQL versions, the system tablespace contained the InnoDB data dictionary, but in MySQL 8.0, InnoDB stores metadata in the MySQL data dictionary.
The doublewrite buffer storage area also resided in the system tablespace in previous MySQL releases, but this storage area resides in separate doublewrite files as of MySQL 8.0.201.
E is stored in tablespace. Not sure why B isn't correct.
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