我MySQL怎么没有了test库

最近在使用MySQL时，发现原来的test库不见了，让我非常惊讶和困惑。

在经过一番查询和研究后，我终于发现了这个问题的原因，具体如下：

mysql> show databases; +--------------------+ | Database | +--------------------+ | information_schema | | mysql | | performance_schema | | sys | +--------------------+ 4 rows in set (0.00 sec) mysql> show tables in mysql; +---------------------------+ | Tables_in_mysql | +---------------------------+ | column_stats | | columns_priv | | db | | event | | func | | general_log | | gtid_executed | | help_category | | help_keyword | | help_relation | | help_topic | | innodb_index_stats | | innodb_table_stats | | ndb_binlog_index | | plugin | | proc | | procs_priv | | proxies_priv | | role_edges | | server_cost | | servers | | slave_master_info | | slave_relay_log_info | | slave_worker_info | | slow_log | | tables_priv | | time_zone | | time_zone_leap_second | | time_zone_name | | time_zone_transition | | time_zone_transition_type | | user | +---------------------------+ 32 rows in set (0.00 sec)