The Ultimate Guide to High Availability with MariaDB

Information Schema INNODB_SYS_TABLESPACES Table

The Information Schema INNODB_SYS_TABLESPACES table contains information about InnoDB tablespaces. Until MariaDB 10.5 it was based on the internal SYS_TABLESPACES table. This internal table was removed in MariaDB 10.6.0, so this Information Schema table has been repurposed to directly reflect the filesystem (fil_system.space_list).

The PROCESS privilege is required to view the table.

It has the following columns:

ColumnDescription
SPACEUnique InnoDB tablespace identifier.
NAMEDatabase and table name separated by a backslash, or the uppercase InnoDB system table name.
FLAG1 if a DATA DIRECTORY option has been specified in CREATE TABLE, otherwise 0.
FILE_FORMATInnoDB file format. Removed in MariaDB 10.3.1
ROW_FORMATInnoDB storage format used for this tablespace. If the Antelope file format is used, this value is always Compact or Redundant. When a table's checksum algorithm is full_crc32 (the default from MariaDB 10.5), the value can only be Compressed or NULL.
PAGE_SIZEPage size in bytes for this tablespace. Until MariaDB 10.5.0, this was the value of the innodb_page_size variable. From MariaDB 10.6.0, contains the physical page size of a page (previously ZIP_PAGE_SIZE).
ZIP_PAGE_SIZEZip page size for this tablespace. Removed in MariaDB 10.6.0.
SPACE_TYPETablespace type. Can be General for general tablespaces or Single for file-per-table tablespaces. Introduced MariaDB 10.2.1. Removed MariaDB 10.5.0.
FS_BLOCK_SIZEFile system block size. Introduced MariaDB 10.2.1.
FILE_SIZEMaximum size of the file, uncompressed. Introduced MariaDB 10.2.1.
ALLOCATED_SIZEActual size of the file as per space allocated on disk. Introduced MariaDB 10.2.1.
FILENAMETablespace datafile path, previously part of the INNODB_SYS_DATAFILES table. Added in MariaDB 10.6.0.

Examples

MariaDB 10.4:

DESC information_schema.innodb_sys_tablespaces;
+----------------+---------------------+------+-----+---------+-------+
| Field          | Type                | Null | Key | Default | Extra |
+----------------+---------------------+------+-----+---------+-------+
| SPACE          | int(11) unsigned    | NO   |     | 0       |       |
| NAME           | varchar(655)        | NO   |     |         |       |
| FLAG           | int(11) unsigned    | NO   |     | 0       |       |
| ROW_FORMAT     | varchar(22)         | YES  |     | NULL    |       |
| PAGE_SIZE      | int(11) unsigned    | NO   |     | 0       |       |
| ZIP_PAGE_SIZE  | int(11) unsigned    | NO   |     | 0       |       |
| SPACE_TYPE     | varchar(10)         | YES  |     | NULL    |       |
| FS_BLOCK_SIZE  | int(11) unsigned    | NO   |     | 0       |       |
| FILE_SIZE      | bigint(21) unsigned | NO   |     | 0       |       |
| ALLOCATED_SIZE | bigint(21) unsigned | NO   |     | 0       |       |
+----------------+---------------------+------+-----+---------+-------+

From MariaDB 10.4:

SELECT * FROM information_schema.INNODB_SYS_TABLESPACES LIMIT 2\G
*************************** 1. row ***************************
         SPACE: 2
          NAME: mysql/innodb_table_stats
          FLAG: 33
    ROW_FORMAT: Dynamic
     PAGE_SIZE: 16384
 ZIP_PAGE_SIZE: 0
    SPACE_TYPE: Single
 FS_BLOCK_SIZE: 4096
     FILE_SIZE: 98304
ALLOCATED_SIZE: 98304
*************************** 2. row ***************************
         SPACE: 3
          NAME: mysql/innodb_index_stats
          FLAG: 33
    ROW_FORMAT: Dynamic
     PAGE_SIZE: 16384
 ZIP_PAGE_SIZE: 0
    SPACE_TYPE: Single
 FS_BLOCK_SIZE: 4096
     FILE_SIZE: 98304
ALLOCATED_SIZE: 98304

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