MariaDB错误 errno: 168 "Unknown (generic) error from engine"

Question

用vagrant搭建了一个LNMP环境：

操作系统是centos 7.4
php是 7.1
MariaDB 是10.2.9

当执行laravel的命令php artisan migrate时，mariadb发生错误:

    [root@vagrant-prod production]# php artisan migrate
    
                                                                                                                    
      [Illuminate\Database\QueryException]                                                                          
      SQLSTATE[HY000]: General error: 1005 Can't create table `production`.`migrations` (errno: 168 "Unknown (generic) error from engine") (SQL: create table `migrations` (`id` int unsigned not null auto_increment primary key, `migration` varchar(255) not null, `batch` int not null) default character set utf8mb4 collate utf8mb4_unicode_ci)                                                                                         
                                                                                                                    
    
                                                                                                                    
      [PDOException]                                                                                                
      SQLSTATE[HY000]: General error: 1005 Can't create table `production`.`migrations` (errno: 168 "Unknown (generic) error from engine")                                                                            
                                                                                                                    

错误有时是这样的：

    [root@vagrant-prod production]# php artisan migrate
    
                                                                                                                    
      [Illuminate\Database\QueryException]                                                                          
      SQLSTATE[42S01]: Base table or view already exists: 1050 Table '`production`.`migrations`' already exists (SQL: create table `migrations` (`id` int unsigned not null auto_increment primary key, `migration` varchar(255) not null, `batch` int not null) default character set utf8mb4 collate utf8mb4_unicode_ci)        
                                                                                                                    
    
                                                                                                                    
      [PDOException]                                                                                                
      SQLSTATE[42S01]: Base table or view already exists: 1050 Table '`production`.`migrations`' already exists                                                                                                       
                

什么原因呢？

Answer 1

"Unknown (generic) error from engine" 未知内部引擎错误，maridb自身原因！