mysql8安装以及配置、参数优化
1.配置bin到path
3.初始化数据库：mysqld --initialize --console ，这⾥会⽣成⼀个初始密码，需要记录下来，否则需要删除datadir⽬录重新初始化
D:\dev\mysql-8.0.11-winx64>mysqld --initialize --console
2018-06-17T21:06:14.524974Z 0 [System] [MY-013169] [Server] D:\dev\mysql-8.0.11-winx64\ (mysqld 8.0.11) initializing of server in progress as process 3768
2018-06-17T21:06:31.388939Z 5 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: i7TntpLMiL,s
2018-06-17T21:06:42.137554Z 0 [System] [MY-013170] [Server] D:\dev\mysql-8.0.11-winx64\ (mysqld 8.0.11) initializing of server has completed
4.安装服务：mysqld --install 服务名 ，服务名可以是任意，最好如：mysql5、mysql8等以便区分（这⾥以mysql8作为服务名）mysqld --verbose --help 查看帮助（帮助⽂档参数较⼤，需要打印到⽂本查看）
卸载服务： mysqld --remove mysql8
D:\dev\mysql-8.0.11-winx64>mysqld --install MySQL8
Service successfully installed.
打开MySQL8查看：
启动~~~（我这边⾃⼰电脑可执⾏⽂件路径始终隐射到C:\Program Files\MySQL，⽽不是我实际安装⽬录）
5.更改密码：（需要⼿动启动上⾯到服务）
mysql -u root -p 输⼊第3步的密码
在mysql shell中执⾏：
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '新密码'；
注：修改默认密码验证插件：shell> mysql--default-auth=mysql_
mysql_old_password为⽼版本验证⽅式，到mysql5.7.5已经废弃。新版使⽤mysql_native_password
my.ini⽂件内容：
实际测试中包含表格中参数都是可以通过初始化的，以下⼏个参数会报错：
'query_cache_size=0'
'innodb_additional_mem_pool_size=2M'
'query_cache_type=0'
以下为正确的，需要修改对应basedir和datadir
# Other default tuning values
# MySQL Server Instance Configuration File
# ----------------------------------------------------------------------
# Generated by the MySQL Server Instance Configuration Wizard
#
#
# Installation Instructions
# ----------------------------------------------------------------------
#
# On Linux you can copy this file to /etc/myf to set global options,
# mysql-data-dir/myf to set server-specific options
# (@localstatedir@ for this installation) or to
# ~/.myf to set user-specific options.
#
# On Windows you should keep this file in the installation directory
# of your server (e.g. C:\Program Files\MySQL\MySQL Server X.Y). To
# make sure the server reads the config file use the startup option
# "--defaults-file".
#
# To run run the server from the command line, execute this in a
# command line shell, e.g.
# mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"
#
# To install the server as a Windows service manually, execute this in a
# command line shell, e.g.
# mysqld --install MySQLXY --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini" #
# And then execute this in a command line shell to start the server, e.g.
# net start MySQLXY
#
#
# Guildlines for editing this file
# ----------------------------------------------------------------------
#
# In this file, you can use all long options that the program supports.
# If you want to know the options a program supports, start the program
# with the "--help" option.
#
# More detailed information about the individual options can also be
# found in the manual.
#
# For advice on how to change settings please see
# sql/doc/refman/5.6/en/server-configuration-defaults.html
#
#
# CLIENT SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by MySQL client applications.
# Note that only client applications shipped by MySQL are guaranteed
# to read this section. If you want your own MySQL client program to
# honor these values, you need to specify it as an option during the
# MySQL client library initialization.
#
[client]
no-beep
# pipe
# socket=0.0
port=3306
[mysql]
default-character-set=utf8
# SERVER SECTION
# ----------------------------------------------------------------------
#
# The following options will be read by the MySQL Server. Make sure that
# you have installed the server correctly (see above) so it reads this
# file.
#
# server_type=3
[mysqld]
# The next three options are mutually exclusive to SERVER_PORT below.
# skip-networking
# enable-named-pipe
# shared-memory
# shared-memory-base-name=MYSQL
# The Pipe the MySQL Server will use
# socket=MYSQL
# The TCP/IP Port the MySQL Server will listen on
port=3306
# Path to installation directory. All paths are usually resolved relative to this. #basedir="C:/Program Files/MySQL/MySQL Server 5.6/"
# Path to the database root
#datadir=C:/ProgramData/MySQL/MySQL Server 5.6/Data
basedir=D:/dev/mysql-8.0.11-winx64/
datadir=D:/dev/mysql-8.0.11-winx64/data
# The default character set that will be used when a new schema or table is # created and no character set is defined
character-set-server=utf8
# The default storage engine that will be used when create new tables when default-storage-engine=INNODB
# Enable Windows Authentication
# plugin-load=authentication_windows.dll
# Server Id.
server-id=1
# The maximum amount of concurrent sessions the MySQL server will
# allow. One of these connections will be reserved for a user with
# SUPER privileges to allow the administrator to login even if the
# connection limit has been reached.
max_connections=151
# The number of open tables for all threads. Increasing this value
# increases the number of file descriptors that mysqld requires.
# Therefore you have to make sure to set the amount of open files
# allowed to at least 4096 in the variable "open-files-limit" in
# section [mysqld_safe]
table_open_cache=2000
# Maximum size for internal (in-memory) temporary tables. If a table
# grows larger than this value, it is automatically converted to disk
# based table This limitation is for a single table. There can be many
# of them.
tmp_table_size=12M
# How many threads we should keep in a cache for reuse. When a client
# disconnects, the client's threads are put in the cache if there aren't
# more than thread_cache_size threads from before. This greatly reduces
# the amount of thread creations needed if you have a lot of new
# connections. (Normally this doesn't give a notable performance
# improvement if you have a good thread implementation.)
thread_cache_size=10
#*** MyISAM Specific options
# The maximum size of the temporary file MySQL is allowed to use while
mysql帮助文档# recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE. # If the file-size would be bigger than this, the index will be created
# through the key cache (which is slower).
myisam_max_sort_file_size=100G
# If the temporary file used for fast index creation would be bigger
# than using the key cache by the amount specified here, then prefer the
# key cache method. This is mainly used to force long character keys in
# large tables to use the slower key cache method to create the index. myisam_sort_buffer_size=15M
# Size of the Key Buffer, used to cache index blocks for MyISAM tables.
# Do not set it larger than 30% of your available memory, as some memory # is also required by the OS to cache rows. Even if you're not using
# MyISAM tables, you should still set it to 8-64M as it will also be
# used for internal temporary disk tables.
key_buffer_size=8M
# Size of the buffer used for doing full table scans of MyISAM tables.
# Allocated per thread, if a full scan is needed.
read_buffer_size=30K
read_rnd_buffer_size=256K
#*** INNODB Specific options ***
# innodb_data_home_dir=0.0
# Use this option if you have a MySQL server with InnoDB support enabled
# but you do not plan to use it. This will save memory and disk space
# and speed up some things.
# skip-innodb
# If set to 1, InnoDB will flush (fsync) the transaction logs to the
# disk at each commit, which offers full ACID behavior. If you are
# willing to compromise this safety, and you are running small
# transactions, you may set this to 0 or 2 to reduce disk I/O to the
# logs. Value 0 means that the log is only written to the log file and
# the log file flushed to disk approximately once per second. Value 2
# means the log is written to the log file at each commit, but the log
# file is only flushed to disk approximately once per second.
innodb_flush_log_at_trx_commit=1
# The size of the buffer InnoDB uses for buffering log data. As soon as
# it is full, InnoDB will have to flush it to disk. As it is flushed
# once per second anyway, it does not make sense to have it very large
# (even with long transactions).
innodb_log_buffer_size=1M
# InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and
# row data. The bigger you set this the less disk I/O is needed to
# access data in tables. On a dedicated database server you may set this
# parameter up to 80% of the machine physical memory size. Do not set it
# too large, though, because competition of the physical memory may
# cause paging in the operating system. Note that on 32bit systems you
# might be limited to 2-3.5G of user level memory per process, so do not
# set it too high.
innodb_buffer_pool_size=32M
# Size of each log file in a log group. You should set the combined size
# of log files to about 25%-100% of your buffer pool size to avoid
# unneeded buffer pool flush activity on log file overwrite. However,
# note that a larger logfile size will increase the time needed for the
# recovery process.
innodb_log_file_size=48M
# Number of threads allowed inside the InnoDB kernel. The optimal value
# depends highly on the application, hardware as well as the OS
# scheduler properties. A too high value may lead to thread thrashing.
innodb_thread_concurrency=9
# The increment size (in MB) for extending the size of an auto-extend InnoDB system tablespace file when it becomes full. innodb_autoextend_increment=64
# The number of regions that the InnoDB buffer pool is divided into.

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