MYSQL数据库表的引擎-2 (使用与修改)

1、修改建表引擎

mysql> CREATE TABLE test_2(
-> name varchar(10),
-> year int(10))
-> ENGINE=InnoDB; -->创建表时指定默认引擎
Query OK, 0 rows affected (0.10 sec)

mysql> show create table test_2\G
*************************** 1. row ***************************
Table: test_2
Create Table: CREATE TABLE `test_2` (
`name` varchar(10) DEFAULT NULL,
`year` int(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

mysql>


mysql> show tables;
+------------------+
| Tables_in_excise |
+------------------+
| test1 |
| test_1 |
+------------------+
2 rows in set (0.00 sec)

mysql> show create table test_1\G
*************************** 1. row ***************************
Table: test_1
Create Table: CREATE TABLE `test_1` (
`name` varchar(20) DEFAULT NULL,
`year` int(5) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 --> 默认的表引擎为MyISAM;
1 row in set (0.00 sec)

mysql> alter  table test_1 type=InnoDB; --> 修改表的数据引擎;
Query OK, 0 rows affected, 1 warning (0.11 sec)
Records: 0 Duplicates: 0 Warnings: 0

mysql> show create table test_1\G
*************************** 1. row ***************************
Table: test_1
Create Table: CREATE TABLE `test_1` (
`name` varchar(20) DEFAULT NULL,
`year` int(5) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 --> 显示表的数据引擎已经变为InnoDB;
1 row in set (0.00 sec)

mysql>

mysql> CREATE TABLE test_2(
    -> name varchar(10),
    -> year int(10))
    -> ENGINE=InnoDB;            -->创建表时指定默认引擎
Query OK, 0 rows affected (0.10 sec)

mysql> show create table test_2\G
*************************** 1. row ***************************
       Table: test_2
Create Table: CREATE TABLE `test_2` (
  `name` varchar(10) DEFAULT NULL,
  `year` int(10) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1
1 row in set (0.00 sec)

mysql>


mysql> show tables;
+------------------+
| Tables_in_excise |
+------------------+
| test1            |
| test_1           |
+------------------+
2 rows in set (0.00 sec)

mysql> show create table test_1\G
*************************** 1. row ***************************
       Table: test_1
Create Table: CREATE TABLE `test_1` (
  `name` varchar(20) DEFAULT NULL,
  `year` int(5) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1     --> 默认的表引擎为MyISAM;
1 row in set (0.00 sec)

mysql> alter table test_1 type=InnoDB;  -->  修改表的数据引擎;
Query OK, 0 rows affected, 1 warning (0.11 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> show create table test_1\G
*************************** 1. row ***************************
       Table: test_1
Create Table: CREATE TABLE `test_1` (
  `name` varchar(20) DEFAULT NULL,
  `year` int(5) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1  --> 显示表的数据引擎已经变为InnoDB;
1 row in set (0.00 sec)

mysql>

2、

mysql> show engines; --> 查看MySQL支持引擎
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| Engine | Support | Comment | Transactions | XA | Savepoints |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
| MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO |
| CSV | YES | CSV storage engine | NO | NO | NO |
| MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | NO | NO | NO |
| InnoDB | YES | Supports transactions, row-level locking, and foreign keys | YES | YES | YES |
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO |
+------------+---------+------------------------------------------------------------+--------------+------+------------+
5 rows in set (0.00 sec)

mysql>