MySQL数据库8.0.11按转

1.修改用户 mysql -u root -p 进入MySQL指令界面

2.修改MySQL数据库密码 ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'ofbiz';

3.展示数据库表 show databases;

4.退出MySQL指令 quit；

5.MySQL数据库my.ini文件内容

[mysqld]

# 设置3306端口

port=3306

# 设置mysql的安装目录

basedir=D:\dev\mysql-8.0.11-winx64\mysql-8.0.11-winx64

 

# 设置mysql数据库的数据的存放目录

datadir=D:\dev\mysql-8.0.11-winx64\mysql-8.0.11-winx64\data

# 允许最大连接数

max_connections=200

# 允许连接失败的次数。这是为了防止有人从该主机试图攻击数据库系统

max_connect_errors=10

# 服务端使用的字符集默认为utf8mb4

character-set-server=utf8mb4

#使用–skip-external-locking MySQL选项以避免外部锁定。该选项默认开启

external-locking = FALSE

# 创建新表时将使用的默认存储引擎

default-storage-engine=INNODB

# 默认使用“mysql_native_password”插件认证

default_authentication_plugin=mysql_native_password

[mysqld_safe]

log-error=D:\dev\mysql-8.0.11-winx64\mysql-8.0.11-winx64\mysql_oldboy.err

pid-file=D:\dev\mysql-8.0.11-winx64\mysql-8.0.11-winx64\mysqld.pid

# 定义mysql应该支持的sql语法，数据校验

sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES

[mysql]

# 设置mysql客户端默认字符集

default-character-set=utf8mb4

[client]

# 设置mysql客户端连接服务端时默认使用的端口

port=3306

default-character-set=utf8mb4

6.MySQL数据库文件结构

 

 

6.MySQL数据库my.ini配置文件参数解释

# 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]

 

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.

#

[mysqld]

 

# The TCP/IP Port the MySQL Server will listen on

#port参数表示的是MySQL数据库的端口，默认的端口是3306，如果你需要更改端口号的话，就可以通过在这里修改

port=3306

 

 

#Path to installation directory. All paths are usually resolved relative to this.

#参数表示MySQL的安装路径

basedir="E:/Java/Mysql/"

 

#Path to the database root

#参数表示MySQL数据文件的存储位置，也是数据库表的存放位置

datadir="C:/ProgramData/MySQL/MySQL Server 5.5/Data/"

 

# The default character set that will be used when a new schema or table is

# created and no character set is defined

#default-character-set参数是客户端默认的字符集，如果你希望它支持中文，可以设置成gbk或者utf8

character-set-server=utf8

 

# The default storage engine that will be used when create new tables when

#参数默认的存储引擎

default-storage-engine=INNODB

 

# Set the SQL mode to strict

#参数表示SQL模式的参数，通过这个参数可以设置检验SQL语句的严格程度

sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

 

# 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.

#参数表示允许同时访问MySQL服务器的最大连接数，其中一个连接是保留的，留给管理员专用的

max_connections=100

 

# Query cache is used to cache SELECT results and later return them

# without actual executing the same query once again. Having the query

# cache enabled may result in significant speed improvements, if your

# have a lot of identical queries and rarely changing tables. See the

# "Qcache_lowmem_prunes" status variable to check if the current value

# is high enough for your load.

# Note: In case your tables change very often or if your queries are

# textually different every time, the query cache may result in a

# slowdown instead of a performance improvement.

#参数表示查询时的缓存大小，缓存中可以存储以前通过select语句查询过的信息，再次查询时就可以直接从缓存中拿出信息

query_cache_size=0

 

# 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]

#参数表示所有进程打开表的总数

table_cache=256

 

# 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.

#参数表示内存中临时表的总数

tmp_table_size=35M

 

 

# 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.)

#参数表示保留客户端线程的缓存

thread_cache_size=8

 

#*** MyISAM Specific options

 

# The maximum size of the temporary file MySQL is allowed to use while

# 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).

#参数表示MySQL重建索引时所允许的最大临时文件的大小

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.

#参数表示重建索引时的缓存大小

myisam_sort_buffer_size=69M

 

# 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.

#参数表示关键词的缓存大小

key_buffer_size=55M

 

# Size of the buffer used for doing full table scans of MyISAM tables.

# Allocated per thread, if a full scan is needed.

#参数表示MyISAM表全表扫描的缓存大小

read_buffer_size=64K

#参数表示将排序好的数据存入该缓存中

read_rnd_buffer_size=256K

 

# This buffer is allocated when MySQL needs to rebuild the index in

# REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE

# into an empty table. It is allocated per thread so be careful with

# large settings.

#参数表示用于排序的缓存大小

sort_buffer_size=256K

#*** INNODB Specific options ***

 

 

# 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

 

# Additional memory pool that is used by InnoDB to store metadata

# information. If InnoDB requires more memory for this purpose it will

# start to allocate it from the OS. As this is fast enough on most

# recent operating systems, you normally do not need to change this

# value. SHOW INNODB STATUS will display the current amount used.

#参数表示附加的内存池，用来存储InnoDB表的内容

innodb_additional_mem_pool_size=3M

 

# 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.

#参数是设置提交日志的时机，若设置为1，InnoDB会在每次提交后将事务日志写到磁盘上

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).

#参数表示用来存储日志数据的缓存区的大小

innodb_log_buffer_size=2M

 

# 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.

#参数表示缓存的大小，InnoDB使用一个缓冲池类保存索引和原始数据

innodb_buffer_pool_size=107M

 

# 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.

#参数表示日志文件的大小

innodb_log_file_size=54M

 

# 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.

#参数表示在InnoDB存储引擎允许的线程最大数

innodb_thread_concurrency=18