MySQL表类型 存储引擎 的选择，

MySQL表类型 存储引擎 的选择，

目录

• 1、查看当前数据库支出的存储引擎
• 方法1：
• 方法2：
• 2、ENGINE={存储引起类型}  创建表的时候，设置存储引擎
• 3、alter able tablename engine={存储引起类型} 修改表为其他存储引擎
• 3.1 常用存储引擎的对比
• 3.2 常用存储引擎学习（MyISAM、InnoDB、MEMORY 和 MERGE）

1、查看当前数据库支出的存储引擎

方法1：

mysql> show engines \G;
*************************** 1. row ***************************
      Engine: InnoDB
     Support: YES
     Comment: Supports transactions, row-level locking, and foreign keys
Transactions: YES
          XA: YES
  Savepoints: YES
*************************** 2. row ***************************
      Engine: MRG_MYISAM
     Support: YES
     Comment: Collection of identical MyISAM tables
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 3. row ***************************
      Engine: MEMORY
     Support: YES
     Comment: Hash based, stored in memory, useful for temporary tables
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 4. row ***************************
      Engine: BLACKHOLE
     Support: YES
     Comment: /dev/null storage engine (anything you write to it disappears)
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 5. row ***************************
      Engine: MyISAM
     Support: DEFAULT
     Comment: MyISAM storage engine
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 6. row ***************************
      Engine: CSV
     Support: YES
     Comment: CSV storage engine
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 7. row ***************************
      Engine: ARCHIVE
     Support: YES
     Comment: Archive storage engine
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 8. row ***************************
      Engine: PERFORMANCE_SCHEMA
     Support: YES
     Comment: Performance Schema
Transactions: NO
          XA: NO
  Savepoints: NO
*************************** 9. row ***************************
      Engine: FEDERATED
     Support: NO
     Comment: Federated MySQL storage engine
Transactions: NULL
          XA: NULL
  Savepoints: NULL
9 rows in set (0.00 sec)

ERROR:
No query specified

方法2：

（Value 显示为“DISABLED”的记录表示支持该存储引擎，但是数据库启动的时候被禁用。）

mysql> show variables like 'have%';
+------------------------+----------+
| Variable_name          | Value    |
+------------------------+----------+
| have_compress          | YES      |
| have_crypt             | NO       |
| have_dynamic_loading   | YES      |
| have_geometry          | YES      |
| have_openssl           | DISABLED |
| have_profiling         | YES      |
| have_query_cache       | YES      |
| have_rtree_keys        | YES      |
| have_ssl               | DISABLED |
| have_statement_timeout | YES      |
| have_symlink           | YES      |
+------------------------+----------+
11 rows in set, 1 warning (0.00 sec)

2、ENGINE={存储引起类型}  创建表的时候，设置存储引擎

mysql> create table a(
    -> i bigint(20) not null auto_increment,
    -> primary key (i)
    -> ) engine=myisam default charset=gbk;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    3
Current database: test

Query OK, 0 rows affected (1.33 sec)

3、alter able tablename engine={存储引起类型} 修改表为其他存储引擎

mysql> alter table a engine=innodb;
Query OK, 0 rows affected (1.70 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> show create table a \G;
*************************** 1. row ***************************
       Table: a
Create Table: CREATE TABLE `a` (
  `i` bigint(20) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`i`)
) ENGINE=InnoDB DEFAULT CHARSET=gbk
1 row in set (0.14 sec)

3.1 常用存储引擎的对比