MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
For an InnoDB table created in a
file-per-table tablespace or general tablespace, table data and
associated indexes are stored in a
.ibd file in the database
directory. When an InnoDB table is created in
the system tablespace, table data and indexes are stored in the
ibdata* files that
represent the system tablespace. The
innodb_file_per_table option
controls whether tables are created in file-per-table
tablespaces or the system tablespace, by default. The
TABLESPACE option can be used to place a
table in a file-per-table tablespace, general tablespace, or the
system tablespace, regardless of the
innodb_file_per_table setting.
For MyISAM tables, the storage engine creates
data and index files. Thus, for each MyISAM
table tbl_name, there are two disk
files.
| File | Purpose |
|---|---|
|
Data file |
|
Index file |
Chapter 18, Alternative Storage Engines, describes what files each storage engine creates to represent tables. If a table name contains special characters, the names for the table files contain encoded versions of those characters as described in Section 11.2.4, “Mapping of Identifiers to File Names”.