MySQL5.6.12造成CPU的使用率 2000%的原因
Top得出CPU使用率超高: top - 16:41:04 up 184 days, 21:31, 2 users, load average: 19.97, 18.38, 18.36Tasks: 584 total,
Top得出CPU使用率超高:
top - 16:41:04 up 184 days, 21:31, 2 users, load average: 19.97, 18.38, 18.36
Tasks: 584 total, 1 running, 583 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 41.2%ni, 58.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 65923008k total, 34622724k used, 31300284k free, 315684k buffers
Swap: 33030136k total, 0k used, 33030136k free, 24200968k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28518 root 20 0 1652m 62m 1172 S 2014.5 0.1 49701,58 mysql_test
24878 root 20 0 15416 1616 896 R 3.9 0.0 0:00.02 top
1 root 20 0 19228 1512 1220 S 0.0 0.0 0:02.95 init
CPU使用率很高很高。
[root@db-m1-slave-1 ~]# ps -eaf|grep mysql
root 24917 24834 0 16:42 pts/1 00:00:00 grep mysql
root 26452 1 0 2013 ? 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/home/data/mysql/data --pid-file=/usr/local/mysql/mysqld.pid
mysql 27584 26452 0 2013 ? 01:56:49 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/home/data/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/usr/local/mysql/mysqld.log --open-files-limit=8192 --pid-file=/usr/local/mysql/mysqld.pid --socket=/usr/local/mysql/mysql.sock --port=3306
root 28518 1 99 2013 ? 2070-22:25:20 ./mysql_test --config=./cfg --threads=20 -B
看到此./mysql_test脚本在运行,find / -name mysql_test
[root@db-m1-slave-1 ~]# find / -name mysql_test
/usr/local/mysql/test/mysql_test
[root@db-m1-slave-1 ~]#
[root@db-m1-slave-1 test]# more mysql_test
******** mysql_test: Not a text file ********
查询到此mysql_test是使用了一个mysql的用户信息收集的插件,,上传到mysql官网了,是个软件运行信息反馈的那种功能。
只要kill掉就没事了。

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

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

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.

MySQL's position in databases and programming is very important. It is an open source relational database management system that is widely used in various application scenarios. 1) MySQL provides efficient data storage, organization and retrieval functions, supporting Web, mobile and enterprise-level systems. 2) It uses a client-server architecture, supports multiple storage engines and index optimization. 3) Basic usages include creating tables and inserting data, and advanced usages involve multi-table JOINs and complex queries. 4) Frequently asked questions such as SQL syntax errors and performance issues can be debugged through the EXPLAIN command and slow query log. 5) Performance optimization methods include rational use of indexes, optimized query and use of caches. Best practices include using transactions and PreparedStatemen

Compared with other programming languages, MySQL is mainly used to store and manage data, while other languages such as Python, Java, and C are used for logical processing and application development. MySQL is known for its high performance, scalability and cross-platform support, suitable for data management needs, while other languages have advantages in their respective fields such as data analytics, enterprise applications, and system programming.

MySQL is suitable for small and large enterprises. 1) Small businesses can use MySQL for basic data management, such as storing customer information. 2) Large enterprises can use MySQL to process massive data and complex business logic to optimize query performance 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 basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

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.
