5.24 The INFORMATION_SCHEMA INNODB_SYS_TABLESPACES Table

The INNODB_SYS_TABLESPACES table provides metadata about InnoDB file-per-table and general tablespaces, equivalent to the information in the SYS_TABLESPACES table in the InnoDB data dictionary.

For related usage information and examples, see InnoDB INFORMATION_SCHEMA System Tables.

Note

The INFORMATION_SCHEMA FILES table reports metadata for all InnoDB tablespace types including file-per-table tablespaces, general tablespaces, the system tablespace, the temporary tablespace, and undo tablespaces, if present.

The INNODB_SYS_TABLESPACES table has these columns:

• SPACE

  The tablespace ID.

• NAME

  The schema (database) and table name.

• FLAG

  A numeric value that represents bit-level information about tablespace format and storage characteristics.

• FILE_FORMAT

  The tablespace file format. For example, Antelope, Barracuda, or Any (general tablespaces support any row format). The data in this field is interpreted from the tablespace flags information that resides in the .ibd file. For more information about InnoDB file formats, see InnoDB File-Format Management.

• ROW_FORMAT

  The tablespace row format (Compact or Redundant, Dynamic, or Compressed). The data in this column is interpreted from the tablespace flags information that resides in the .ibd file.

• PAGE_SIZE

  The tablespace page size. The data in this column is interpreted from the tablespace flags information that resides in the .ibd file.

• ZIP_PAGE_SIZE

  The tablespace zip page size. The data in this column is interpreted from the tablespace flags information that resides in the .ibd file.

• SPACE_TYPE

  The type of tablespace. Possible values include General for general tablespaces and Single for file-per-table tablespaces.

• FS_BLOCK_SIZE

  The file system block size, which is the unit size used for hole punching. This column pertains to the InnoDB transparent page compression feature.

• FILE_SIZE

  The apparent size of the file, which represents the maximum size of the file, uncompressed. This column pertains to the InnoDB transparent page compression feature.

• ALLOCATED_SIZE

  The actual size of the file, which is the amount of space allocated on disk. This column pertains to the InnoDB transparent page compression feature.

Example

mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES WHERE SPACE = 26\G
*************************** 1. row ***************************
         SPACE: 26
          NAME: test/t1
          FLAG: 0
   FILE_FORMAT: Antelope
    ROW_FORMAT: Compact or Redundant
     PAGE_SIZE: 16384
 ZIP_PAGE_SIZE: 0
    SPACE_TYPE: Single
 FS_BLOCK_SIZE: 4096
     FILE_SIZE: 98304
ALLOCATED_SIZE: 65536

Notes

• You must have the PROCESS privilege to query this table.

• Use the INFORMATION_SCHEMA COLUMNS table or the SHOW COLUMNS statement to view additional information about the columns of this table, including data types and default values.

• Because tablespace flags are always zero for all Antelope file formats (unlike table flags), there is no way to determine from this flag integer if the tablespace row format is Redundant or Compact. As a result, the possible values for the ROW_FORMAT field are “Compact or Redundant”, “Compressed”, or “Dynamic.”

• With the introduction of general tablespaces, InnoDB system tablespace data (for SPACE 0) is exposed in INNODB_SYS_TABLESPACES.