Information Schema INNODB_SYS_TABLES Table

The INNODB_SYS_TABLES table exposes the internal InnoDB data dictionary metadata for tables, including row formats and space IDs.

The Information Schema INNODB_SYS_TABLES table contains information about InnoDB tables.

The PROCESS privilege is required to view the table.

It has the following columns:

Field	Type	Null	Default	Description
TABLE_ID	bigint(21) unsigned	NO	0	Unique InnoDB table identifier.
NAME	varchar(655)	NO		Database and table name, or the uppercase InnoDB system table name.
FLAG	int(11)	NO	0	See Flag below
N_COLS	int(11) unsigned (>= MariaDB 10.5) int(11) (<= MariaDB 10.4)	NO	0	Number of columns in the table. The count includes two or three hidden InnoDB system columns, appended to the end of the column list: DB_ROW_ID (if there is no primary key or unique index on NOT NULL columns), DB_TRX_ID, DB_ROLL_PTR.
SPACE	int(11) unsigned (>= MariaDB 10.5) int(11) (<= MariaDB 10.4)	NO	0	Tablespace identifier where the index resides. 0 represents the InnoDB system tablespace, while any other value represents a table created in file-per-table mode (see the innodb_file_per_table system variable). Remains unchanged after a TRUNCATE TABLE statement.
FILE_FORMAT	varchar(10)	YES	NULL	InnoDB file format (Antelope or Barracuda).
ROW_FORMAT	enum('Redundant', 'Compact', 'Compressed', 'Dynamic') (>= MariaDB 10.5)varchar(12) (<= MariaDB 10.4)	YES	NULL	InnoDB storage format (Compact, Redundant, Dynamic, or Compressed).
ZIP_PAGE_SIZE	int(11) unsigned	NO	0	For Compressed tables, the zipped page size.
SPACE_TYPE	enum('Single','System') (>= MariaDB 10.5)varchar(10) (<= MariaDB 10.4)	YES	NULL

Flag

The flag field returns the dict_table_t::flags that correspond to the data dictionary record.

Bit	Description
0	Set if ROW_FORMAT is not REDUNDANT.
1 to 4	0, except for ROW_FORMAT=COMPRESSED, where they will determine the KEY_BLOCK_SIZE (the compressed page size).
5	Set for ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED.
6	Set if the DATA DIRECTORY attribute was present when the table was originally created.
7	Set if the page_compressed attribute is present.
8 to 11	Determine the page_compression_level.
12 13	Normally 00, but 11 for "no-rollback tables".

Note that the table flags returned here are not the same as tablespace flags (FSP_SPACE_FLAGS).

Example

SELECT * FROM information_schema.INNODB_SYS_TABLES LIMIT 2\G
*************************** 1. row ***************************
     TABLE_ID: 14
         NAME: SYS_DATAFILES
         FLAG: 0
       N_COLS: 5
        SPACE: 0
   ROW_FORMAT: Redundant
ZIP_PAGE_SIZE: 0
   SPACE_TYPE: System
*************************** 2. row ***************************
     TABLE_ID: 11
         NAME: SYS_FOREIGN
         FLAG: 0
       N_COLS: 7
        SPACE: 0
   ROW_FORMAT: Redundant
ZIP_PAGE_SIZE: 0
   SPACE_TYPE: System
2 rows in set (0.00 sec)

See Also

• InnoDB Data Dictionary Troubleshooting

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