Documentation Home
MySQL 8.0 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 44.0Mb
PDF (A4) - 44.0Mb
PDF (RPM) - 33.4Mb
HTML Download (TGZ) - 10.2Mb
HTML Download (Zip) - 10.2Mb
HTML Download (RPM) - 7.0Mb
Man Pages (TGZ) - 203.0Kb
Man Pages (Zip) - 310.2Kb
Info (Gzip) - 3.9Mb
Info (Zip) - 3.9Mb
Excerpts from this Manual

MySQL 8.0 Reference Manual  /  ...  /  The INFORMATION_SCHEMA INNODB_TEMP_TABLE_INFO Table

25.38.28 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 Section 15.14.7, “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.


User Comments
User comments in this section are, as the name implies, provided by MySQL users. The MySQL documentation team is not responsible for, nor do they endorse, any of the information provided here.
Sign Up Login You must be logged in to post a comment.