MySQL會話臨時表空間

1、物理文件 [root@roidb1 data]# cd \#innodb_temp/ [root@roidb1 #innodb_temp]# ls -lh total 160K -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_10.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_1.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_2.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_3.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_4.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_5.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_6.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_7.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_8.ibt -rw-r-----. 1 mysql mysql 80K Nov 22 18:58 temp_9.ibt [root@roidb1 #innodb_temp]# 2、臨時表空間目錄 mysql> show variables like 'innodb_temp_tablespaces_dir'; +-----------------------------+-----------------+ | Variable_name | Value | +-----------------------------+-----------------+ | innodb_temp_tablespaces_dir | ./#innodb_temp/ | +-----------------------------+-----------------+ 1 row in set (0.00 sec) 使用了新的版本MySQL8.0.18，有很多地方和MySQL5.7有很大的區別。 Defines the location where InnoDB creates a pool of session temporary tablespaces at startup. The default location is the #innodb_temp directory in the data directory. A fully qualified path or path relative to the data directory is permitted. 說明：定義了創建臨時表空間池的位置。默認位置爲#innodb_temp目錄。 As of MySQL 8.0.16, session temporary tablespaces always store user-created temporary tables and internal temporary tables created by the optimizer using InnoDB. (Previously, the on-disk storage engine for internal temporary tables was determined by the internal_tmp_disk_storage_engine system variable, which is no longer supported. 說明：從MySQL8.0.16版本以後，會話臨時表空間總是存儲創建用戶臨時表和 內部臨時表。