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15.14.8 Retrieving InnoDB Tablespace Metadata from INFORMATION_SCHEMA.FILES

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

This section provides InnoDB-specific usage examples. For more information about data provided by the INFORMATION_SCHEMA.FILES table, see Section 25.11, “The INFORMATION_SCHEMA FILES Table”.

Note

The INNODB_TABLESPACES and INNODB_DATAFILES tables also provide metadata about InnoDB tablespaces, but data is limited to file-per-table, general, and undo tablespaces.

This query retrieves metadata about the InnoDB system tablespace from fields of the INFORMATION_SCHEMA.FILES table that are pertinent to InnoDB tablespaces. INFORMATION_SCHEMA.FILES fields that are not relevant to InnoDB always return NULL, and are excluded from the query.

  1. mysql> SELECT FILE_ID, FILE_NAME, FILE_TYPE, TABLESPACE_NAME, FREE_EXTENTS,
  2.        TOTAL_EXTENTS,  EXTENT_SIZE, INITIAL_SIZE, MAXIMUM_SIZE, AUTOEXTEND_SIZE, DATA_FREE, STATUS ENGINE
  3.        FROM INFORMATION_SCHEMA.FILES WHERE TABLESPACE_NAME LIKE 'innodb_system' \G
  4. *************************** 1. row ***************************
  5.         FILE_ID: 0
  6.       FILE_NAME: ./ibdata1
  7.       FILE_TYPE: TABLESPACE
  8. TABLESPACE_NAME: innodb_system
  9.    FREE_EXTENTS: 0
  10.   TOTAL_EXTENTS: 12
  11.     EXTENT_SIZE: 1048576
  12.    INITIAL_SIZE: 12582912
  13.    MAXIMUM_SIZE: NULL
  14. AUTOEXTEND_SIZE: 67108864
  15.       DATA_FREE: 4194304
  16.          ENGINE: NORMAL

This query retrieves the FILE_ID (equivalent to the space ID) and the FILE_NAME (which includes path information) for InnoDB file-per-table and general tablespaces. File-per-table and general tablespaces have a .ibd file extension.

  1. mysql> SELECT FILE_ID, FILE_NAME FROM INFORMATION_SCHEMA.FILES
  2.        WHERE FILE_NAME LIKE '%.ibd%' ORDER BY FILE_ID;
  3.     +---------+---------------------------------------+
  4.     | FILE_ID | FILE_NAME                             |
  5.     +---------+---------------------------------------+
  6.     |       2 | ./mysql/plugin.ibd                    |
  7.     |       3 | ./mysql/servers.ibd                   |
  8.     |       4 | ./mysql/help_topic.ibd                |
  9.     |       5 | ./mysql/help_category.ibd             |
  10.     |       6 | ./mysql/help_relation.ibd             |
  11.     |       7 | ./mysql/help_keyword.ibd              |
  12.     |       8 | ./mysql/time_zone_name.ibd            |
  13.     |       9 | ./mysql/time_zone.ibd                 |
  14.     |      10 | ./mysql/time_zone_transition.ibd      |
  15.     |      11 | ./mysql/time_zone_transition_type.ibd |
  16.     |      12 | ./mysql/time_zone_leap_second.ibd     |
  17.     |      13 | ./mysql/innodb_table_stats.ibd        |
  18.     |      14 | ./mysql/innodb_index_stats.ibd        |
  19.     |      15 | ./mysql/slave_relay_log_info.ibd      |
  20.     |      16 | ./mysql/slave_master_info.ibd         |
  21.     |      17 | ./mysql/slave_worker_info.ibd         |
  22.     |      18 | ./mysql/gtid_executed.ibd             |
  23.     |      19 | ./mysql/server_cost.ibd               |
  24.     |      20 | ./mysql/engine_cost.ibd               |
  25.     |      21 | ./sys/sys_config.ibd                  |
  26.     |      23 | ./test/t1.ibd                         |
  27.     |      26 | /home/user/test/test/t2.ibd           |
  28.     +---------+---------------------------------------+

This query retrieves the FILE_ID and FILE_NAME for the InnoDB global temporary tablespace. Global temporary tablespace file names are prefixed by ibtmp.

  1. mysql> SELECT FILE_ID, FILE_NAME FROM INFORMATION_SCHEMA.FILES
  2.        WHERE FILE_NAME LIKE '%ibtmp%';
  3. +---------+-----------+
  4. | FILE_ID | FILE_NAME |
  5. +---------+-----------+
  6. |      22 | ./ibtmp1  |
  7. +---------+-----------+

Similarly, InnoDB undo tablespace file names are prefixed by undo. The following query returns the FILE_ID and FILE_NAME for InnoDB undo tablespaces.

  1. mysql> SELECT FILE_ID, FILE_NAME FROM INFORMATION_SCHEMA.FILES
  2.        WHERE FILE_NAME LIKE '%undo%';

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Document created the 26/06/2006, last modified the 26/10/2018
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