Memory Allocation in the MySQL Server

https://dev.mysql.com/doc/internals/en/memory-allocation-mysql-server.html

MySQL Internals Manual  /  Memory Allocation  /  Memory Allocation in the MySQL Server (sql Directory)

9.1 Memory Allocation in the MySQL Server (sql Directory)

The basic logic to use:

All things that are used only for the duration of a query are allocated in THD::mem_root through sql_alloc() or thd->alloc() except:

  • Things that may grow, like string buffers of type String. See sql/sql_string.cc.
  • Large blocks of memory used in one state of the query that can be released early. These are things like sort buffers, range trees, etc.
  • Things in libraries that are outside of MySQL‘s control (like hash tables).

Things that are needed a longer time should be alllocated with my_malloc() or through another MEMROOT.

时间： 2024-08-25 06:15:42

Memory Allocation in the MySQL Server的相关文章

Chapter 5 MySQL Server Administration_1

Chapter 5 MySQL Server Administration Table of Contents 5.1 The MySQL Server 5.1.1 Configuring the Server 5.1.2 Server Configuration Defaults 5.1.3 Server Option and Variable Reference 5.1.4 Server Command Options 5.1.5 Server System Variables 5.1.6

MySQL启动错误ERROR! MySQL server PID file could not be found的解决办法

/etc/init.d/mysql start无法启动mysql错误信息如下: ERROR! MySQL server PID file could not be found! Starting MySQL.. ERROR! The server quit without updating PID file (/usr/local/mysql/var/AYXXXXXXXXXXX.pid). 完整日志信息如下: 140902 18:11:33 mysqld_safe Starting mysqld

mysql 服务重启报MySQL server PID file could not be found!*pid...

今天只是想发表个感慨,同时将这部分教训写出来,让大家有个经验,很简单的mysql数据库搭建,网上有很多安装教程,不用多说. 我只是把我安装后遇到的问题写出来,给自己提个醒,MySQL数据库装完之后(是卸载删除了以前的mysql重装的),我就直接启动mysql服务,service mysql restart ,发现报出如下错误. [[email protected] mysql]# service mysql restartMySQL server PID file could not be fo

#2006 - MySQL server has gone away

#2006 - MySQL server has gone away 对于web应用来说,经常会用到mysql,而数据的备份与还原是web应用经常做的事,一般来说,用客户端工具phpmyadmin,sqlyog 等,来备份数据库没有任何问题,还原时经常碰到mysql提示的#2006错误. Error: 2006 (CR_SERVER_GONE_ERROR) Message: MySQL server has gone away 原因可能是sql语句过长,超过mysql通信缓存区最大长度: 调整m

Mac下如何玩MySQL Server

最近搞事务相关的语句,开始搞select for update了,在ECS上做实验,发现我安装的版本只支持MyISAM,不支持InnoDB,事务没法玩.于是在Mac上安装了一份MySQL Server. 如何安装,如何玩转,看说明书是最好的~ 我的机器上,StartupItems安装失败了,也不知道为什么.不过,MySQL Server安装是成功的,所以采用手动模式启动就OK了.      shell> cd /usr/local/mysql shell> sudo ./bin/mysqld_

Native memory allocation (mmap) failed to map 142606336 bytes for committing reserved memory.

这里写链接内容 问题描述 Java程序运行过程中抛出java.lang.OutOfMemoryError: unable to create new native thread,如下所示: [java] view plain copy java.lang.OutOfMemoryError: unable to create new native thread at java.lang.Thread.start0(Native Method) at java.lang.Thread.start(T

mysql链接错误：2003 can't connect to mysql server on 10038

出现这个错误原因是端口号不是3306. 打开D:\Program Files\MySQL\MySQL Server 5.5 \my.ini文件,当然还有其他的.ini的文件: [client] port=3306 [mysql] default-character-set=utf8 # SERVER SECTION# ----------------------------------------------------------------------## The following opt

解决mysql报错Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’

启动mysql 报错: ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) 1.先查看 /etc/rc.d/init.d/mysqld status 看看m y s q l 是否已经启动.另外看看是不是权限问题. 2.确定你的mysql.sock是不是在那个位置,mysql -u 你的mysql用户名 -p -S /var/lib/mysql/

解决MySQL workbench的Can't connect to MySQL server on '127.0.0.1'(10061)问题

如题,今天打开MySQL时,出现了这种问题,无法连接到数据库 问题原因:The error (2003) Can't connect to MySQL server on 'server' (10061) indicates that the network connection has been refused. You should check that there is a MySQL server running, that it has network connections enab