我已经从/var/lib/mysql/删除了数据库“ staging_copy” 文件夹，现在当我重新启动mysql服务器时，它显示以下错误。
mysql.service的作业失败，因为控制过程退出 错误代码。请参见“ systemctl状态mysql.service”和“ journalctl -xe” 有关详细信息。
我检查了错误日志：
tail -n 20 /var/log/mysql/error.log
2019-06-04T09:35:50.540861Z 0 [ERROR] InnoDB: Tablespace 14449 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540865Z 0 [ERROR] InnoDB: Tablespace 14452 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540870Z 0 [ERROR] InnoDB: Tablespace 14455 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540888Z 0 [ERROR] InnoDB: Tablespace 14434 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540894Z 0 [ERROR] InnoDB: Tablespace 14437 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540906Z 0 [ERROR] InnoDB: Tablespace 14440 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540910Z 0 [ERROR] InnoDB: Tablespace 14443 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540923Z 0 [ERROR] InnoDB: Tablespace 14416 was not found at ./staging_copy/FTS_0000000000003c0b_BEING_DELETED_CACHE.ibd.
2019-06-04T09:35:50.540927Z 0 [ERROR] InnoDB: Tablespace 14417 was not found at ./staging_copy/FTS_0000000000003c0b_CONFIG.ibd.
2019-06-04T09:35:50.540930Z 0 [ERROR] InnoDB: Tablespace 14418 was not found at ./staging_copy/FTS_0000000000003c0b_DELETED.ibd.
2019-06-04T09:35:50.540934Z 0 [ERROR] InnoDB: Tablespace 14419 was not found at ./staging_copy/FTS_0000000000003c0b_DELETED_CACHE.ibd.
2019-06-04T09:35:50.540942Z 0 [ERROR] InnoDB: Tablespace 14420 was not found at ./staging_copy/FTS_0000000000003c0b_000000000000936b_INDEX_1.ibd.
2019-06-04T09:35:50.540946Z 0 [ERROR] InnoDB: Tablespace 14421 was not found at ./staging_copy/FTS_0000000000003c0b_000000000000936b_INDEX_2.ibd.
2019-06-04T09:35:50.540952Z 0 [ERROR] InnoDB: Tablespace 14422 was not found at ./staging_copy/FTS_0000000000003c0b_000000000000936b_INDEX_3.ibd.
2019-06-04T09:35:50.540957Z 0 [ERROR] InnoDB: Tablespace 14423 was not found at ./staging_copy/FTS_0000000000003c0b_000000000000936b_INDEX_4.ibd.
2019-06-04T09:35:50.540964Z 0 [ERROR] InnoDB: Tablespace 14424 was not found at ./staging_copy/FTS_0000000000003c0b_000000000000936b_INDEX_5.ibd.
2019-06-04T09:35:50.540968Z 0 [ERROR] InnoDB: Tablespace 14425 was not found at ./staging_copy/FTS_0000000000003c0b_000000000000936b_INDEX_6.ibd.
2019-06-04T09:35:50.540972Z 0 [ERROR] InnoDB: Tablespace 14428 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.540978Z 0 [ERROR] InnoDB: Tablespace 14431 was not found at ./staging_copy/#sql-44e5_173.ibd.
2019-06-04T09:35:50.541011Z 0 [ERROR] InnoDB: Cannot continue operation.
那么，在这里需要执行什么操作才能删除“ staging_copy”数据库的所有引用？