可以看到其实文件描述符还是存在的
# lsof -p 1405|grep deleted
mysqld 1405 999 9uW REG 252,1 50331648 1442005 /var/lib/mysql/ib_logfile1 (deleted)
mysqld 1405 999 10uW REG 252,1 196608 1442006 /var/lib/mysql/#ib_16384_0.dblwr (deleted)
mysqld 1405 999 11uW REG 252,1 8585216 1442007 /var/lib/mysql/#ib_16384_1.dblwr (deleted)
mysqld 1405 999 12uW REG 252,1 16777216 1442009 /var/lib/mysql/undo_001 (deleted)
mysqld 1405 999 13u REG 0,47 0 1442013 /tmp/ibI2pqU8 (deleted)
mysqld 1405 999 14uW REG 252,1 16777216 1442011 /var/lib/mysql/undo_002 (deleted)
mysqld 1405 999 15uW REG 252,1 12582912 1442015 /var/lib/mysql/ibtmp1 (deleted)
mysqld 1405 999 16uW REG 252,1 31457280 1442008 /var/lib/mysql/mysql.ibd (deleted)
mysqld 1405 999 24w REG 252,1 532 1442321 /var/lib/mysql/binlog.000002 (deleted)
mysqld 1405 999 26uW REG 252,1 81920 1442016 /var/lib/mysql/#innodb_temp/temp_1.ibt (deleted)
mysqld 1405 999 27uW REG 252,1 81920 1442017 /var/lib/mysql/#innodb_temp/temp_2.ibt (deleted)
mysqld 1405 999 28uW REG 252,1 81920 1442018 /var/lib/mysql/#innodb_temp/temp_3.ibt (deleted)
mysqld 1405 999 29uW REG 252,1 81920 1442019 /var/lib/mysql/#innodb_temp/temp_4.ibt (deleted)
mysqld 1405 999 30uW REG 252,1 81920 1442020 /var/lib/mysql/#innodb_temp/temp_5.ibt (deleted)
mysqld 1405 999 31uW REG 252,1 81920 1442021 /var/lib/mysql/#innodb_temp/temp_6.ibt (deleted)
mysqld 1405 999 32uW REG 252,1 81920 1442022 /var/lib/mysql/#innodb_temp/temp_7.ibt (deleted)
mysqld 1405 999 33uW REG 252,1 81920 1442023 /var/lib/mysql/#innodb_temp/temp_8.ibt (deleted)
mysqld 1405 999 34uW REG 252,1 81920 1442024 /var/lib/mysql/#innodb_temp/temp_9.ibt (deleted)
mysqld 1405 999 35uW REG 252,1 81920 1442315 /var/lib/mysql/#innodb_temp/temp_10.ibt (deleted)