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25.39.23 The INFORMATION_SCHEMA INNODB _SESSION _TEMP _TABLESPACES Table

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The INNODB_SESSION_TEMP_TABLESPACES table provides metadata about session temporary tablespaces used for internal and user-created temporary tables. This table was added in MySQL 8.0.13.

The INNODB_SESSION_TEMP_TABLESPACES table has these columns:

  • ID

    The process or session ID.

  • SPACE

    The tablespace ID. A range of 400 thousand space IDs is reserved for session temporary tablespaces. Session temporary tablespaces are recreated each time the server is started. Space IDs are not persisted when the server is shut down and may be reused.

  • PATH

    The tablespace data file path. A session temporary tablespace has an ibt file extension.

  • SIZE

    The size of the tablespace, in bytes.

  • STATE

    The state of the tablespace. ACTIVE indicates that the tablespace is currently used by a session. INACTIVE indicates that the tablespace is in the pool of available session temporary tablespaces.

  • PURPOSE

    The purpose of the tablespace. INTRINSIC indicates that the tablespace is used for optimized internal temporary tables use by the optimizer. SLAVE indicates that the tablespace is allocated for storing user-created temporary tables on a replication slave. USER indicates that the tablespace is used for user-created temporary tables. NONE indicates that the tablespace is not in use.

Example

  1. mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_SESSION_TEMP_TABLESPACES;
  2. +----+------------+----------------------------+-------+----------+-----------+
  3. | ID | SPACE      | PATH                       | SIZE  | STATE    | PURPOSE   |
  4. +----+------------+----------------------------+-------+----------+-----------+
  5. |  8 | 4294566162 | ./#innodb_temp/temp_10.ibt | 81920 | ACTIVE   | INTRINSIC |
  6. |  8 | 4294566161 | ./#innodb_temp/temp_9.ibt  | 98304 | ACTIVE   | USER      |
  7. |  0 | 4294566153 | ./#innodb_temp/temp_1.ibt  | 81920 | INACTIVE | NONE      |
  8. |  0 | 4294566154 | ./#innodb_temp/temp_2.ibt  | 81920 | INACTIVE | NONE      |
  9. |  0 | 4294566155 | ./#innodb_temp/temp_3.ibt  | 81920 | INACTIVE | NONE      |
  10. |  0 | 4294566156 | ./#innodb_temp/temp_4.ibt  | 81920 | INACTIVE | NONE      |
  11. |  0 | 4294566157 | ./#innodb_temp/temp_5.ibt  | 81920 | INACTIVE | NONE      |
  12. |  0 | 4294566158 | ./#innodb_temp/temp_6.ibt  | 81920 | INACTIVE | NONE      |
  13. |  0 | 4294566159 | ./#innodb_temp/temp_7.ibt  | 81920 | INACTIVE | NONE      |
  14. |  0 | 4294566160 | ./#innodb_temp/temp_8.ibt  | 81920 | INACTIVE | NONE      |
  15. +----+------------+----------------------------+-------+----------+-----------+

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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.


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