对于微软来说,2012年是比较特殊的一年,因为微软放弃了单纯向各大硬件厂商提供软件产品,而再次以硬件商的身份推出了Surface平板电脑。在过去的这一年中,Surface平板电脑整体表现虽然不尽人意,但微软依然坚信它能有更好的表现,于是Surface 2和Surface Pr
对于微软来说,2012年是比较特殊的一年,因为微软放弃了单纯向各大硬件厂商提供软件产品,而再次以硬件商的身份推出了Surface平板电脑。在过去的这一年中,Surface平板电脑整体表现虽然不尽人意,但微软依然坚信它能有更好的表现,于是Surface 2和Surface Pro 2来了。
微软是于北京时间9月23日晚10点30分召开的发布会,在发布会上微软正式对外发布了Surface第二代产品:Surface 2和Surface Pro 2。
Surface 2
Surface 2即是Surface RT的第二代产品,它运行Windows RT 8.1的系统,搭载了全新处理器、1080P IPS屏幕、蓝牙4.0、USB3.0和miniDP接口,Surface一共分为2个版本,分别是32G和64G,最低从449美元起售(税前约合人民币2748元)。
Surface Pro 2
Surface 2 Pro搭载了Windows 8.1 Pro,使用了英特尔Haswell处理器,使得图形性能和处理能力得到提升的同时,续航能力也从4小时提高到了7小时,续航时间提升75%,其它硬件配置则是10.6英寸屏幕、1080P IPS屏幕,此外Surface Pro机身容量一共有4个版本,分别是64G、128G、256G和512G,其中需要指出的是64G和128G版本配备的是4G内存,而256和512G版本则配备的是8G内存,据悉第二代Surface Pro将从899美元起售(税前约合人民币5441元)。
键盘增加背光,方便暗光下使用
更多颜色的键盘
Docking Station扩展底座
拥有这个底座,你就拥有HDMI接口、以太网接口和USB接口等
专为DJ打造的组件
DJ的应用程序
除此之外,微软还发布了Power Cover供电键盘、多颜色的Type Cover 2、Docking Station扩展底座和专为DJ打造的专属组件。
以上新品,将会于10月22日正式上市,而预订则可以从北京时间9月24日晚8点开始。

MySQLoffersvariousstorageengines,eachsuitedfordifferentusecases:1)InnoDBisidealforapplicationsneedingACIDcomplianceandhighconcurrency,supportingtransactionsandforeignkeys.2)MyISAMisbestforread-heavyworkloads,lackingtransactionsupport.3)Memoryengineis

Common security vulnerabilities in MySQL include SQL injection, weak passwords, improper permission configuration, and unupdated software. 1. SQL injection can be prevented by using preprocessing statements. 2. Weak passwords can be avoided by forcibly using strong password strategies. 3. Improper permission configuration can be resolved through regular review and adjustment of user permissions. 4. Unupdated software can be patched by regularly checking and updating the MySQL version.

Identifying slow queries in MySQL can be achieved by enabling slow query logs and setting thresholds. 1. Enable slow query logs and set thresholds. 2. View and analyze slow query log files, and use tools such as mysqldumpslow or pt-query-digest for in-depth analysis. 3. Optimizing slow queries can be achieved through index optimization, query rewriting and avoiding the use of SELECT*.

To monitor the health and performance of MySQL servers, you should pay attention to system health, performance metrics and query execution. 1) Monitor system health: Use top, htop or SHOWGLOBALSTATUS commands to view CPU, memory, disk I/O and network activities. 2) Track performance indicators: monitor key indicators such as query number per second, average query time and cache hit rate. 3) Ensure query execution optimization: Enable slow query logs, record and optimize queries whose execution time exceeds the set threshold.

The main difference between MySQL and MariaDB is performance, functionality and license: 1. MySQL is developed by Oracle, and MariaDB is its fork. 2. MariaDB may perform better in high load environments. 3.MariaDB provides more storage engines and functions. 4.MySQL adopts a dual license, and MariaDB is completely open source. The existing infrastructure, performance requirements, functional requirements and license costs should be taken into account when choosing.

MySQL uses a GPL license. 1) The GPL license allows the free use, modification and distribution of MySQL, but the modified distribution must comply with GPL. 2) Commercial licenses can avoid public modifications and are suitable for commercial applications that require confidentiality.

The situations when choosing InnoDB instead of MyISAM include: 1) transaction support, 2) high concurrency environment, 3) high data consistency; conversely, the situation when choosing MyISAM includes: 1) mainly read operations, 2) no transaction support is required. InnoDB is suitable for applications that require high data consistency and transaction processing, such as e-commerce platforms, while MyISAM is suitable for read-intensive and transaction-free applications such as blog systems.

In MySQL, the function of foreign keys is to establish the relationship between tables and ensure the consistency and integrity of the data. Foreign keys maintain the effectiveness of data through reference integrity checks and cascading operations. Pay attention to performance optimization and avoid common errors when using them.


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