Documentation Home
MySQL Information Schema
Related Documentation Download this Excerpt
PDF (US Ltr) - 0.7Mb
PDF (A4) - 0.7Mb


MySQL Information Schema  /  INFORMATION_SCHEMA InnoDB Tables  /  The INFORMATION_SCHEMA INNODB_TEMP_TABLE_INFO Table

5.27 The INFORMATION_SCHEMA INNODB_TEMP_TABLE_INFO Table

The INNODB_TEMP_TABLE_INFO table provides information about user-created InnoDB temporary tables that are active in an InnoDB instance. It does not provide information about internal InnoDB temporary tables used by the optimizer. The INNODB_TEMP_TABLE_INFO table is created when first queried, exists only in memory, and is not persisted to disk.

For usage information and examples, see InnoDB INFORMATION_SCHEMA Temporary Table Info Table.

The INNODB_TEMP_TABLE_INFO table has these columns:

  • TABLE_ID

    The table ID of the temporary table.

  • NAME

    The name of the temporary table.

  • N_COLS

    The number of columns in the temporary table. The number includes three hidden columns created by InnoDB (DB_ROW_ID, DB_TRX_ID, and DB_ROLL_PTR).

  • SPACE

    The ID of the temporary tablespace where the temporary table resides.

Example

mysql> CREATE TEMPORARY TABLE t1 (c1 INT PRIMARY KEY) ENGINE=INNODB;
mysql> SELECT * FROM INFORMATION_SCHEMA.INNODB_TEMP_TABLE_INFO\G
*************************** 1. row ***************************
TABLE_ID: 97
    NAME: #sql8c88_43_0
  N_COLS: 4
   SPACE: 76

Notes

  • This table is useful primarily for expert-level monitoring.

  • 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.