存储引擎
查看：
show table status like 'bigcourse';
结果：
+-----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-----------+----------+--------------------+---------+ | Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment | +-----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-----------+----------+--------------------+---------+ | bigcourse | InnoDB | 10 | Dynamic | 2 | 8192 | 16384 | 0 | 0 | 0 | 43 | 2018-06-30 13:46:32 | 2018-07-02 19:32:05 | NULL | utf8_bin | NULL | row_format=DYNAMIC | | +-----------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+---------------------+------------+-----------+----------+--------------------+---------+ 1 row in set
字段含义:
Row_format:行的格式。
Data_free:表示已分配但目前没有使用的空间。这部分空间包括了之前删除的行，以及后续可以被INSERT利用到的空间。
MyISAM：不支持事务和行级锁，崩溃后无法安全恢复。
选择哪种搜索引擎
mysql中只有MyISAM支持地理空间搜索。