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 15.15.7, “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.
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
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.