


Detailed graphic tutorial on mysql 5.7.14 installation and configuration method_MySQL
The installation process of mysql 5.7.14 is recorded as follows, I hope it will be helpful to everyone.
1. Download MySQL 5.7.14
Download link: http://dev.mysql.com/downloads/installer/
The specific download process is shown in the picture below:
2. MySQL 5.7 installation
Better installation instructions found online:
Article 1: http://www.bitsCN.com/article/84152.htm
Article 2: http://www.bitsCN.com/article/90275.htm (configuration in folder format)
3. Summary of MySQL 5.7 problems
1. Solve the problem of crash when opening MySQL 5.7 Command line Client (as shown in the picture below)
Case introduction:
I am learning ssh recently and need to use a database, so I downloaded a MySQL Server from the official website. After installation, when I opened the command line, it always crashed and I was very anxious, so I collected some solutions online and wrote them here. Share it with everyone.
1). Check out some parameters executed by MySQL Command Line Client by default. Method: Start->All Programs->MySQL->MySQL Server 5.7->MySQL 5.7 Command Line Client, right-click properties.
2). View the contents of the target file:
Copy the file content as follows:
"D:MySQLMySQL Server 5.7binmysql.exe" "--defaults-file=D:MySQLMySQL Server 5.7my.ini" "-uroot" "-p"
3). Go to the directory D:MySQLMySQL Server 5.7my.ini to check if there is a my.ini file. I find that there is no file, there is only one my-default.ini.
4). Copy my-default.ini, rename it to my.ini, problem solved! ! !
2. Note that during this change process, the originally configured root user password may be deleted (change the root user password)
Reference link: http://www.bitsCN.com/article/84146.htm (written in more detail)
Note: The above picture content can be realized by my own operation, and the relevant reference links are more comprehensive.
The above is the entire content of this article. I hope it will be helpful to everyone’s study and I hope you will support me a lot.

ACID attributes include atomicity, consistency, isolation and durability, and are the cornerstone of database design. 1. Atomicity ensures that the transaction is either completely successful or completely failed. 2. Consistency ensures that the database remains consistent before and after a transaction. 3. Isolation ensures that transactions do not interfere with each other. 4. Persistence ensures that data is permanently saved after transaction submission.

MySQL is not only a database management system (DBMS) but also closely related to programming languages. 1) As a DBMS, MySQL is used to store, organize and retrieve data, and optimizing indexes can improve query performance. 2) Combining SQL with programming languages, embedded in Python, using ORM tools such as SQLAlchemy can simplify operations. 3) Performance optimization includes indexing, querying, caching, library and table division and transaction management.

MySQL uses SQL commands to manage data. 1. Basic commands include SELECT, INSERT, UPDATE and DELETE. 2. Advanced usage involves JOIN, subquery and aggregate functions. 3. Common errors include syntax, logic and performance issues. 4. Optimization tips include using indexes, avoiding SELECT* and using LIMIT.

MySQL is an efficient relational database management system suitable for storing and managing data. Its advantages include high-performance queries, flexible transaction processing and rich data types. In practical applications, MySQL is often used in e-commerce platforms, social networks and content management systems, but attention should be paid to performance optimization, data security and scalability.

The relationship between SQL and MySQL is the relationship between standard languages and specific implementations. 1.SQL is a standard language used to manage and operate relational databases, allowing data addition, deletion, modification and query. 2.MySQL is a specific database management system that uses SQL as its operating language and provides efficient data storage and management.

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


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