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show engines;
+------------+---------+----------------------------------------------------------------+
| Engine | Support | Comment |
+------------+---------+----------------------------------------------------------------+
| MyISAM | YES | Default engine as of MySQL 3.23 with great performance |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables |
| InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys |
| BerkeleyDB | YES | Supports transactions and page-level locking |
| BLACKHOLE | NO | /dev/null storage engine (anything you write to it disappears) |
| EXAMPLE | NO | Example storage engine |
| ARCHIVE | NO | Archive storage engine |
| CSV | NO | CSV storage engine |
| ndbcluster | NO | Clustered, fault-tolerant, memory-based tables |
| FEDERATED | NO | Federated MySQL storage engine |
| MRG_MYISAM | YES | Collection of identical MyISAM tables |
| ISAM | NO | Obsolete storage engine |
+------------+---------+-------------------------------------
DEFAULT 为默认引擎。
在 /etc/my.cnf 中修改默认存储引擎
2. 设置InnoDB为默认引擎：在配置文件my.cnf中的 [mysqld] 下面加入default-storage-engine=INNODB 一句，保存。
3. 重启mysql服务器：mysqladmin -u root -p shutdown或者service mysqld restart 登录mysql数据库，在mysql>提示符下搞入show engines;命令。如果出现 InnoDB |DEFAULT，则表示我们 设置InnoDB为默认引擎成功。
改变现有的表引擎：
ALTER TABLE engineTest ENGINE = INNODB；
查看修改后的状态：
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