安装mysql中遇到的问题1 原文出自博客园 引用地址:http://www.cnblogs.com/xusir/p/3342722.html 安装mysql中遇到的问题1 我的debian7之前安装了mysql-server,是通过apt安装的,后来我卸载掉, 然后用whereis mysql查找, 把所有关于mysql的目录删除掉,包括带my
安装mysql中遇到的问题1原文出自博客园
引用地址:http://www.cnblogs.com/xusir/p/3342722.html
安装mysql中遇到的问题1
我的debian7之前安装了mysql-server,是通过apt安装的,后来我卸载掉,
然后用whereis mysql查找,
把所有关于mysql的目录删除掉,包括带mysqld的目录及文件.
重新安装mysql,安装过程中没有提示错误,也没有提示要输入root密码之类的,
完成后 ,通过whereis mysql无法找到安装的文件,which mysql也无法找到,运行提示无mysql命令....请问这个问题该如何解决.
这是我在其它平台上提的问题,可惜没有人回答,最后自己多次搜索尝试终于解决.
以下是解决这个问题的过程:
1.在网上看到这部分,
sudo dpkg --remove mysql-serversudo
apt-get purge -f mysql-server mysql-commonsudo
apt-get install mysql-server mysql-common
这里主要是把原来的mysql全部删除掉,重新进行安装.
但是我这里重新安装后会出现如下问题
正在设置 mysql-server-5.5 (5.5.27-0ubuntu2) ...start: Job failed to startinvoke-rc.d: initscript mysql,
action "start" failed.dpkg: error processing mysql-server-5.5 (--configure): 子进程
已安装 post-installation 脚本
返回了错误号 1dpkg: dependency problems prevent configuration of mysql-server: mysql-server
依赖于 mysql-server-5.5;
然而: 软件包 mysql-server-5.5 尚未配置。dpkg: error processing mysql-server (--configure):
依赖关系问题 - 仍未被配置因为错误消息指示这是由于上一个问题导致的错误,没有写入 apport 报告。
在处理时有错误发生: mysql-server-5.5 mysql-server
E: Sub-process /usr/bin/dpkg returned an error code (1)
针对这个问题继续查找资料,最的又找到了一部分
删除mysql前 先删除一下 /var/lib/mysql 还有 /etc/mysql
sudo rm /var/lib/mysql/ -R
sudo rm /etc/mysql/ -R
sudo apt-get autoremove mysql* --purge
sudo apt-get remove apparmor
sudo apt-get install mysql-server mysql-common
复制代码
到这里就解决了这个问题了.用了一个下午的时间,坑呀.中间差一点就换重装系统了,事实证明重装系统不是明智之举,很多问题是可遇而不可求的,如果重装系统可能就可以正常安装mysql,但是这个问题哪天可能还会出现,与其逃避不如直面其难.解决问题了也可以增强信心,尤其做这一行的,有问题一定要尽量想办法解决,而不回避.好了,后面是废话.

Stored procedures are precompiled SQL statements in MySQL for improving performance and simplifying complex operations. 1. Improve performance: After the first compilation, subsequent calls do not need to be recompiled. 2. Improve security: Restrict data table access through permission control. 3. Simplify complex operations: combine multiple SQL statements to simplify application layer logic.

The working principle of MySQL query cache is to store the results of SELECT query, and when the same query is executed again, the cached results are directly returned. 1) Query cache improves database reading performance and finds cached results through hash values. 2) Simple configuration, set query_cache_type and query_cache_size in MySQL configuration file. 3) Use the SQL_NO_CACHE keyword to disable the cache of specific queries. 4) In high-frequency update environments, query cache may cause performance bottlenecks and needs to be optimized for use through monitoring and adjustment of parameters.

The reasons why MySQL is widely used in various projects include: 1. High performance and scalability, supporting multiple storage engines; 2. Easy to use and maintain, simple configuration and rich tools; 3. Rich ecosystem, attracting a large number of community and third-party tool support; 4. Cross-platform support, suitable for multiple operating systems.

The steps for upgrading MySQL database include: 1. Backup the database, 2. Stop the current MySQL service, 3. Install the new version of MySQL, 4. Start the new version of MySQL service, 5. Recover the database. Compatibility issues are required during the upgrade process, and advanced tools such as PerconaToolkit can be used for testing and optimization.

MySQL backup policies include logical backup, physical backup, incremental backup, replication-based backup, and cloud backup. 1. Logical backup uses mysqldump to export database structure and data, which is suitable for small databases and version migrations. 2. Physical backups are fast and comprehensive by copying data files, but require database consistency. 3. Incremental backup uses binary logging to record changes, which is suitable for large databases. 4. Replication-based backup reduces the impact on the production system by backing up from the server. 5. Cloud backups such as AmazonRDS provide automation solutions, but costs and control need to be considered. When selecting a policy, database size, downtime tolerance, recovery time, and recovery point goals should be considered.

MySQLclusteringenhancesdatabaserobustnessandscalabilitybydistributingdataacrossmultiplenodes.ItusestheNDBenginefordatareplicationandfaulttolerance,ensuringhighavailability.Setupinvolvesconfiguringmanagement,data,andSQLnodes,withcarefulmonitoringandpe

Optimizing database schema design in MySQL can improve performance through the following steps: 1. Index optimization: Create indexes on common query columns, balancing the overhead of query and inserting updates. 2. Table structure optimization: Reduce data redundancy through normalization or anti-normalization and improve access efficiency. 3. Data type selection: Use appropriate data types, such as INT instead of VARCHAR, to reduce storage space. 4. Partitioning and sub-table: For large data volumes, use partitioning and sub-table to disperse data to improve query and maintenance efficiency.

TooptimizeMySQLperformance,followthesesteps:1)Implementproperindexingtospeedupqueries,2)UseEXPLAINtoanalyzeandoptimizequeryperformance,3)Adjustserverconfigurationsettingslikeinnodb_buffer_pool_sizeandmax_connections,4)Usepartitioningforlargetablestoi


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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

SublimeText3 Chinese version
Chinese version, very easy to use

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.
