


Talk about the current situation, prospects and opportunities of CentOS6.5_x64
Environment: CentOS6.5_x64Python version: 2.6 Use pyinstaller to package pyinstaller can package the python program into a binary file. The packaged file can also be executed in an environment without python (but there must be relevant underlying libc related so files). pyinstaller supports packaging python programs into a single file. All it does is convert text into binary, which does not speed up python. On the contrary, it will affect the running speed of the packaged program. Install pyinstaller through pip: pip install pyinstaller through source code: python setup.py install packager plus the -F parameter can package the program into a separate file: pyinstaller -F test1.py Use virtualenv packaging virtualenv is used to package an application Create an "isolated" Python
1. Detailed introduction to program packaging
Introduction: Environment: CentOS6.5_x64Python version: 2.6 Use pyinstaller to package pyinstaller can package python programs into binary files. The packaged files can also be executed in environments without python (but there must be relevant underlying libc related so files). pyinstaller supports packaging python programs into a single file. All it does is convert text into binary, which does not speed up python. On the contrary, it will affect the running speed of the packaged program. Install p...
2. MySQL-Detailed explanation of dual-machine HA based on Keepalived (picture and text)
Introduction: 1. Environment description: OS: CentOS6.5_X64 MASTER: 192.168.0.202 BACKUP: 192.168.0.203 VIP: 192.168.0.2042, configure two Mysql masters Synchronization Regarding the installation of MySQL, you can also refer to "MySQL - CentOS6.5 Compile and Install MySQL5.6.16". Master-master synchronization is based on master-slave synchronization and the slave server is configured as
3. Sample code for MySQL-CentOS6.5_x64 installation and configuration drbd8.4.2
# #Introduction: 1. Host resources: NameIP configuration remarks Master192.168.0.152sda/10G,sdb/10G; Slave192.168.0.153sda/10G,sdb/10G; *************** *******************************DRBD download address: htt
4. MySQL——CentOS6.5_x64 installation configuration drbd8.4.2
5.
PHP7+Nginx configuration and installation tutorial detailed explanation php7 mysql php7 installation tutorial ubuntu php
Introduction: nginx, php7: Detailed explanation of the configuration and installation tutorial of PHP7+Nginx: Below, the editor of this site will share with you the configuration and installation tutorial of PHP7+Nginx for your benefit. For reference, please forgive me if this article is not well written. System environment: centos6.5 x64 software version: nginx-1.10.0 php-7.0.6 Install NginxNginx official website: http://nginx.org/ First install some components that the compilation depends on. Copy the code as follows: yum install pcre pcre-devel openssl openssl-devel -y##6.
Keepalived+Mysql for MySQL high availability##Introduction: Environment description: OS: CentOS6.5_X64MASTER: 192.168.0.202BACKUP: 192.168.0.203VIP: 192.168.0.2041. Configure two Mysql master master synchronization [root@master~]#yuminstallmysql -servermy
##7. Installation and configuration of MongoDB database under CentOS 6.5_X64
Introduction: Linux operating system: CentOS6.5_X64IP address: 192.168.1.12 Purpose: Install and configure MongoDB database Specific operations: 1. Close SElinux, configure firewall 1. vi /
8. CentOS 6.5_x64 Install Oracle 11g R2
##Introduction: Installation environment: Operation System: CentOS6.5_x64 Desktop host name: Oracledb Memory: 1G (official minimum requirement 1G) Hard disk: 40G (4.29G and 1.7G required for enterprise version installation
[Related Q&A recommendations 】:
The above is the detailed content of Talk about the current situation, prospects and opportunities of CentOS6.5_x64. For more information, please follow other related articles on the PHP Chinese website!

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.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

SublimeText3 Chinese version
Chinese version, very easy to use

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

Dreamweaver Mac version
Visual web development tools

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.