OS & MySQL的版本和配置:
MySQL Version: 5.6.19 Linux Version: Linux boston.oracle.com 2.6.18-164.el5 #1 SMP Thu Sep 3 02:16:47 EDT 2009 i686 i686 i386 GNU/Linux
一,下载MySQL安装软件,请到www.oracle.com 去找DATABASE DOWNLOAD,下载MySQL需要注册一个账号。我下载的版本如下:
下载后解压就是以下的8个文件 :
二, 在Linux上安装MySQL(一个服务器程序和一个客户端程序)
[root@vmoel5u4 mysql_installer]# ll
total 115896
-rw-r--r-- 1 root root 22925106 May 8 2014 MySQL-client-advanced-5.6.19-1.rhel5.i386.rpm
-rw-r--r-- 1 root root 95621549 May 8 2014 MySQL-server-advanced-5.6.19-1.rhel5.i386.rpm
--安装Server端:
[root@vmoel5u4 mysql_installer]# rpm -ivh MySQL-server-advanced-5.6.19-1.rhel5.i386.rpm
Preparing... ########################################### [100%]
1:MySQL-server-advanced ########################################### [100%]
2012-11-18 00:34:49 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2012-11-18 00:34:49 16251 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2012-11-18 00:34:49 16251 [Note] InnoDB: The InnoDB memory heap is disabled
2012-11-18 00:34:49 16251 [Note] InnoDB: Mutexes and rw_locks use InnoDB's own implementation
2012-11-18 00:34:49 16251 [Note] InnoDB: Compressed tables use zlib 1.2.3
2012-11-18 00:34:49 16251 [Note] InnoDB: Using Linux native AIO
2012-11-18 00:34:49 16251 [Note] InnoDB: Not using CPU crc32 instructions
2012-11-18 00:34:49 16251 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2012-11-18 00:34:49 16251 [Note] InnoDB: Completed initialization of buffer pool
2012-11-18 00:34:49 16251 [Note] InnoDB: The first specified data file ./ibdata1 did not exist: a new database to be created!
2012-11-18 00:34:49 16251 [Note] InnoDB: Setting file ./ibdata1 size to 12 MB
2012-11-18 00:34:49 16251 [Note] InnoDB: Database physically writes the file full: wait...
2012-11-18 00:34:49 16251 [Note] InnoDB: Setting log file ./ib_logfile101 size to 48 MB
2012-11-18 00:34:50 16251 [Note] InnoDB: Setting log file ./ib_logfile1 size to 48 MB
2012-11-18 00:34:50 16251 [Note] InnoDB: Renaming log file ./ib_logfile101 to ./ib_logfile0
2012-11-18 00:34:50 16251 [Warning] InnoDB: New log files created, LSN=45781
2012-11-18 00:34:50 16251 [Note] InnoDB: Doublewrite buffer not found: creating new
2012-11-18 00:34:50 16251 [Note] InnoDB: Doublewrite buffer created
2012-11-18 00:34:50 16251 [Note] InnoDB: 128 rollback segment(s) are active.
2012-11-18 00:34:50 16251 [Warning] InnoDB: Creating foreign key constraint system tables.
2012-11-18 00:34:50 16251 [Note] InnoDB: Foreign key constraint system tables created
2012-11-18 00:34:50 16251 [Note] InnoDB: Creating tablespace and datafile system tables.
2012-11-18 00:34:50 16251 [Note] InnoDB: Tablespace and datafile system tables created.
2012-11-18 00:34:50 16251 [Note] InnoDB: Waiting for purge to start
2012-11-18 00:34:50 16251 [Note] InnoDB: 5.6.19 started; log sequence number 0
2012-11-18 00:34:50 16251 [Note] RSA private key file not found: /var/lib/mysql//private_key.pem. Some authentication plugins will not work.
2012-11-18 00:34:50 16251 [Note] RSA public key file not found: /var/lib/mysql//public_key.pem. Some authentication plugins will not work.
A random root password has been set. You will find it in '/root/.mysql_secret'.
2012-11-18 00:34:51 16251 [Note] Binlog end
2012-11-18 00:34:51 16251 [Note] InnoDB: FTS optimize thread exiting.
2012-11-18 00:34:51 16251 [Note] InnoDB: Starting shutdown...
2012-11-18 00:34:53 16251 [Note] InnoDB: Shutdown completed; log sequence number 1625977
2012-11-18 00:34:53 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2012-11-18 00:34:53 16282 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2012-11-18 00:34:53 16282 [Note] InnoDB: The InnoDB memory heap is disabled
2012-11-18 00:34:53 16282 [Note] InnoDB: Mutexes and rw_locks use InnoDB's own implementation
2012-11-18 00:34:53 16282 [Note] InnoDB: Compressed tables use zlib 1.2.3
2012-11-18 00:34:53 16282 [Note] InnoDB: Using Linux native AIO
2012-11-18 00:34:53 16282 [Note] InnoDB: Not using CPU crc32 instructions
2012-11-18 00:34:53 16282 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2012-11-18 00:34:53 16282 [Note] InnoDB: Completed initialization of buffer pool
2012-11-18 00:34:53 16282 [Note] InnoDB: Highest supported file format is Barracuda.
2012-11-18 00:34:53 16282 [Note] InnoDB: 128 rollback segment(s) are active.
2012-11-18 00:34:53 16282 [Note] InnoDB: Waiting for purge to start
2012-11-18 00:34:53 16282 [Note] InnoDB: 5.6.19 started; log sequence number 1625977
2012-11-18 00:34:53 16282 [Note] RSA private key file not found: /var/lib/mysql//private_key.pem. Some authentication plugins will not work.
2012-11-18 00:34:53 16282 [Note] RSA public key file not found: /var/lib/mysql//public_key.pem. Some authentication plugins will not work.
2012-11-18 00:34:53 16282 [Note] Binlog end
2012-11-18 00:34:53 16282 [Note] InnoDB: FTS optimize thread exiting.
2012-11-18 00:34:53 16282 [Note] InnoDB: Starting shutdown...
2012-11-18 00:34:55 16282 [Note] InnoDB: Shutdown completed; log sequence number 1625987
A RANDOM PASSWORD HAS BEEN SET FOR THE MySQL root USER !
You will find that password in '/root/.mysql_secret'.
You must change that password on your first connect,
no other statement but 'SET PASSWORD' will be accepted.
See the manual for the semantics of the 'password expired' flag.
Also, the account for the anonymous user has been removed.
In addition, you can run:
/usr/bin/mysql_secure_installation
which will also give you the option of removing the test database.
This is strongly recommended for production servers.
/* 上面的红色的大概意思如下:
为MySQL的数据库的root的用户生成了一个随机的秘密,请到/root/.mysql_secret里去找密码。
当你第一次登陆时必须修改密码,同时匿名帐号已经被删除掉了。
除此之外,你可以执行:
/usr/bin/mysql_secure_installation
他可以给你一些移除test 数据库的选项。
强烈推荐在生产服务器上做此操作。
*/
See the manual for more instructions.
Please report any problems athttp://bugs.mysql.com/
The latest information about MySQL is available on the web at
http://www.mysql.com
Support MySQL by buying support/licenses athttp://shop.mysql.com
New default config file was created as /usr/my.cnf and
will be used by default by the server when you start it.
You may edit this file to change server settings
--安装Client端:
[root@vmoel5u4 mysql_installer]# rpm -ivh MySQL-client-advanced-5.6.19-1.rhel5.i386.rpm
Preparing... ########################################### [100%]
1:MySQL-client-advanced ########################################### [100%]
三,MySQL 数据库的配置
1,启动MySQL服务
[root@vmoel5u4 mysql_installer]# cd /etc/rc.d/init.d
[root@vmoel5u4 init.d]# service mysql start
Starting MySQL.......... [ OK ]
2,修改MySQL数据库root用户的初始密码,先查下初始密码
[root@vmoel5u4 mysql_installer]# vi /root/.mysql_secret
# The random password set for the root user at Sun Nov 18 00:34:51 2012 (local time): kX65UtYvovXN9VOV
从上面可以初始密码是:kX65UtYvovXN9VOV
[root@vmoel5u4 init.d]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or /g.
Your MySQL connection id is 15
Server version: 5.6.19-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.
mysql>
/*修改密码为123456*/
mysql> update user set password=PASSWORD('123456') where user='root';
Query OK, 3 rows affected (0.00 sec)
Rows matched: 3 Changed: 3 Warnings: 0
/*刷新权限表*/
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)
3,用新密码123456登陆MySQL
[root@vmoel5u4 init.d]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or /g.
Your MySQL connection id is 16
Server version: 5.6.19-enterprise-commercial-advanced MySQL Enterprise Server - Advanced Edition (Commercial)
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '/h' for help. Type '/c' to clear the current input statement.
mysql> use mysql ;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select Host,User,Password from user;
+-----------+------+-------------------------------------------+
| Host | User | Password |
+-----------+------+-------------------------------------------+
| localhost | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| 127.0.0.1 | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
| ::1 | root | *6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9 |
+-----------+------+-------------------------------------------+
3 rows in set (0.00 sec)
4, 创建新的表test,并插入测试数据
mysql> create table test(id int);
Query OK, 0 rows affected (0.05 sec)
mysql> insert into test(id) values(1);
Query OK, 1 row affected (0.05 sec)
mysql> insert into test(id) values(2);
Query OK, 1 row affected (0.01 sec)
mysql> commit;
Query OK, 0 rows affected (0.00 sec)
mysql> select * from test;
+------+
| id |
+------+
| 1 |
| 2 |
+------+
2 rows in set (0.02 sec)

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.


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