mysqld install mysql default_MySQL安装默认配置

查看MySQL默认数据保存地，执行语句：

SELECT @@databir;

查看MySQL安装文件路径，执行语句：

SELECT @@basedir;

MySQL默认配置文件：

# 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/my.cnf to set global options,

# mysql-data-dir/my.cnf to set server-specific options

# (@localstatedir@ for this installation) or to

# ~/.my.cnf 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 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

#

#

# Guidelines 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

# https://dev.mysql.com/doc/refman/8.0/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]

# pipe=

# socket=MYSQL

port=3306

[mysql]

no-beep

# default-character-set=

# 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 8.0/"

# Path to the database root

datadir=C:/ProgramData/MySQL/MySQL Server 8.0/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=

# The default authentication plugin to be used when connecting to the server

default_authentication_plugin=caching_sha2_password

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

default-storage-engine=INNODB

# Set the SQL mode to strict

sql-mode="STRICT_TRANS_TABLES,NO_ENGINE_SUBSTITUTION"

# General and Slow logging.

log-output=FILE

general-log=0

general_log_file="BO.log"

slow-query-log=1

slow_query_log_file="BO-slow.log"

long_query_time=10

# Error Logging.

log-error="BO.err"

# ***** Group Replication Related *****

# Specifies the base name to use for binary log files. With binary logging

# enabled, the server logs all statements that change data to the binary

# log, which is used for backup and replication.

log-bin="BO-bin"

# ***** Group Replication Related *****

# Sets the binary logging format, and can be any one of STATEMENT, ROW,

# or MIXED. ROW is suggested for Group Replication.

# binlog_format

# ***** Group Replication Related *****

# Causes the master to write a checksum for each event in the binary log.

# binlog_checksum supports the values NONE (disabled) and CRC32.

# The default is CRC32. When disabled (value NONE), the server verifies

# that it is writing only complete events to the binary log by writing

# and checking the event length (rather than a checksum) for each event.

# NONE must be used with Group Replication.

# binlog_checksum

# ***** Group Replication Related *****

# The base name for the relay log. The server creates relay log files in

# sequence by adding a numeric suffix to the base name. If you specify this

# option, the value specified is also used as the base name for the relay log

# index file. Relay logs increase speed by using load-balancing between disks.

# relay_log

# ***** Group Replication Related *****

# Specifies the server ID. For servers that are used in a replication topology,

# you must specify a unique server ID for each replication server, in the

# range from 1 to 2^32 − 1. “Unique” means that each ID must be different

# from every other ID in use by any other replication master or slave.

server-id=1

# ***** Group Replication Related *****

# The host name or IP address of the slave to be reported to the master

# during slave registration. This value appears in the output of SHOW SLAVE HOSTS

# on the master server. Leave the value unset if you do not want the slave to

# register itself with the master.

# report_host=0.0

# ***** Group Replication Related *****

# The TCP/IP port number for connecting to the slave, to be reported to the master during

# slave registration. Set this only if the slave is listening on a nondefault port or if

# you have a special tunnel from the master or other clients to the slave.

report_port=3306

# ***** Group Replication Related *****

# This option specifies whether global transaction identifiers (GTIDs) are

# used to identify transactions. ON must be used with Group Replication.

# gtid_mode

# ***** Group Replication Related *****

# When enabled, the server enforces GTID consistency by allowing execution of

# only statements that can be safely logged using a GTID. You must set this

# option to ON before enabling GTID based replication.

# enforce_gtid_consistency

# ***** Group Replication Related *****

# Whether updates received by a slave server from a master server should be

# logged to the slave's own binary log. Binary logging must be enabled on

# the slave for this variable to have any effect. ON must be used with

# Group Replication.

# log_slave_updates

# ***** Group Replication Related *****

# Determines whether the slave server logs master status and connection information

# to an InnoDB table in the mysql database, or to a file in the data directory.

# The TABLE setting is required when multiple replication channels are configured.

# master_info_repository

# ***** Group Replication Related *****

# Determines whether the slave server logs its position in the relay logs to an InnoDB

# table in the mysql database, or to a file in the data directory. The TABLE setting is

# required when multiple replication channels are configured.

# relay_log_info_repository

# ***** Group Replication Related *****

# Defines the algorithm used to hash the writes extracted during a transaction. If you

# are using Group Replication, this variable must be set to XXHASH64 because the process

# of extracting the writes from a transaction is required for conflict detection on all

# group members.

# transaction_write_set_extraction

# NOTE: Modify this value after Server initialization won't take effect.

lower_case_table_names=1

# Secure File Priv.

secure-file-priv="C:/ProgramData/MySQL/MySQL Server 8.0/Uploads"

# 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=23M

# 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

# 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

# The size of the buffer that is allocated when sorting MyISAM indexes

# during a REPAIR TABLE or when creating indexes with CREATE INDEX

# or ALTER TABLE.

myisam_sort_buffer_size=36M

# 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=64K

read_rnd_buffer_size=256K

#*** INNODB Specific options ***

# innodb_data_home_dir=

# 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=8M

# 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=17

# 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.

# For systems with buffer pools in the multi-gigabyte range, dividing the buffer pool into separate instances can improve concurrency,

# by reducing contention as different threads read and write to cached pages.

innodb_buffer_pool_instances=8

# Determines the number of threads that can enter InnoDB concurrently.

innodb_concurrency_tickets=5000

# Specifies how long in milliseconds (ms) a block inserted into the old sublist must stay there after its first access before

# it can be moved to the new sublist.

innodb_old_blocks_time=1000

# It specifies the maximum number of .ibd files that MySQL can keep open at one time. The minimum value is 10.

innodb_open_files=300

# When this variable is enabled, InnoDB updates statistics during metadata statements.

innodb_stats_on_metadata=0

# When innodb_file_per_table is enabled (the default in 5.6.6 and higher), InnoDB stores the data and indexes for each newly created table

# in a separate .ibd file, rather than in the system tablespace.

innodb_file_per_table=1

# Use the following list of values: 0 for crc32, 1 for strict_crc32, 2 for innodb, 3 for strict_innodb, 4 for none, 5 for strict_none.

innodb_checksum_algorithm=0

# The number of outstanding connection requests MySQL can have.

# This option is useful when the main MySQL thread gets many connection requests in a very short time.

# It then takes some time (although very little) for the main thread to check the connection and start a new thread.

# The back_log value indicates how many requests can be stacked during this short time before MySQL momentarily

# stops answering new requests.

# You need to increase this only if you expect a large number of connections in a short period of time.

back_log=80

# If this is set to a nonzero value, all tables are closed every flush_time seconds to free up resources and

# synchronize unflushed data to disk.

# This option is best used only on systems with minimal resources.

flush_time=0

# The minimum size of the buffer that is used for plain index scans, range index scans, and joins that do not use

# indexes and thus perform full table scans.

join_buffer_size=256K

# The maximum size of one packet or any generated or intermediate string, or any parameter sent by the

# mysql_stmt_send_long_data() C API function.

max_allowed_packet=4M

# If more than this many successive connection requests from a host are interrupted without a successful connection,

# the server blocks that host from performing further connections.

max_connect_errors=100

# Changes the number of file descriptors available to mysqld.

# You should try increasing the value of this option if mysqld gives you the error "Too many open files".

open_files_limit=4161

# If you see many sort_merge_passes per second in SHOW GLOBAL STATUS output, you can consider increasing the

# sort_buffer_size value to speed up ORDER BY or GROUP BY operations that cannot be improved with query optimization

# or improved indexing.

sort_buffer_size=256K

# The number of table definitions (from .frm files) that can be stored in the definition cache.

# If you use a large number of tables, you can create a large table definition cache to speed up opening of tables.

# The table definition cache takes less space and does not use file descriptors, unlike the normal table cache.

# The minimum and default values are both 400.

table_definition_cache=1400

# Specify the maximum size of a row-based binary log event, in bytes.

# Rows are grouped into events smaller than this size if possible. The value should be a multiple of 256.

binlog_row_event_max_size=8K

# If the value of this variable is greater than 0, a replication slave synchronizes its master.info file to disk.

# (using fdatasync()) after every sync_master_info events.

sync_master_info=10000

# If the value of this variable is greater than 0, the MySQL server synchronizes its relay log to disk.

# (using fdatasync()) after every sync_relay_log writes to the relay log.

sync_relay_log=10000

# If the value of this variable is greater than 0, a replication slave synchronizes its relay-log.info file to disk.

# (using fdatasync()) after every sync_relay_log_info transactions.

sync_relay_log_info=10000

# Load mysql plugins at start."plugin_x ; plugin_y".

# plugin_load

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

# loose_mysqlx_port=33060