修改MySQL的默認(rèn)數(shù)據(jù)存儲引擎

因為MySQL默認(rèn)的是MyISAM數(shù)據(jù)引擎，不支持事務(wù)也不支持外鍵，所以需要用到Innodb引擎，于是決定將mysql的默認(rèn)引擎設(shè)置為innodb。

1 . 查看MySQL存儲引擎是用的哪個？登錄MySQL數(shù)據(jù)庫，在mysql>提示符下搞入show engines;命令。
+------------+---------+----------------------------------------------------------------+
-
 

| Engine     | Support | Comment                                                        |
+------------+---------+----------------------------------------------------------------+
| MyISAM     | DEFAULT | Default engine as of MySQL 3.23 with great performance         |
| MEMORY     | YES     | Hash based, stored in memory, useful for temporary tables      |
| InnoDB     | YES     | 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                                        |
+------------+---------+----------------------------------------------------------------+

說明目前默認(rèn)的數(shù)據(jù)引擎是MyISAM，并且也支持InnoDB引擎。

2. 設(shè)置InnoDB為默認(rèn)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. 重啟mysql服務(wù)器：mysqladmin -u root -p shutdown或者service mysqld restart 登錄mysql數(shù)據(jù)庫，在mysql>提示符下搞入show engines;命令。如果出現(xiàn) InnoDB |DEFAULT，則表示我們 設(shè)置InnoDB為默認(rèn)引擎成功。

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