Information Schema TEMP_TABLES_INFO Table
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MariaDB starting with 10.2.2
The Information Schema TEMP_TABLES_INFO table contains information about active InnoDB temporary tables.
All user and system-created temporary tables are reported when querying this table, with the exception of optimized internal temporary tables. The data is stored in memory.
Previously, InnoDB temp table metadata was rather stored in InnoDB system tables.
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It has the following columns:
Column | Description |
---|---|
TABLE_ID | Table ID. |
NAME | Table name. |
N_COLS | Number of columns in the temporary table, including three hidden columns that InnoDB creates (DB_ROW_ID, DB_TRX_ID, and DB_ROLL_PTR). |
SPACE | Numerical identifier for the tablespace identifier holding the temporary table. |
PER_TABLE_TABLESPACE | If TRUE , the temporary table resides in a separate per-table tablespace. If FALSE , it resides in the shared temporary tablespace. |
IS_COMPRESSED | TRUE if the table is compressed. |
Examples
CREATE TEMPORARY TABLE t (i INT) ENGINE=INNODB; SELECT * FROM INFORMATION_SCHEMA.INNODB_TEMP_TABLE_INFO; +----------+--------------+--------+-------+----------------------+---------------+ | TABLE_ID | NAME | N_COLS | SPACE | PER_TABLE_TABLESPACE | IS_COMPRESSED | +----------+--------------+--------+-------+----------------------+---------------+ | 39 | #sql1c93_3_1 | 4 | 64 | FALSE | FALSE | +----------+--------------+--------+-------+----------------------+---------------+
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