Other default tuning values#

MySQL Server Instance Configuration File#

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Generated by the MySQL Server Instance Configuration Wizard#

#

Installation Instructions#

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#

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#

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#

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#

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#

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#

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=“LAPTOP-LRAT6QCM.log”

slow-query-log=1

slow_query_log_file=“LAPTOP-LRAT6QCM-slow.log”

long_query_time=10

Error Logging.#

log-error=“LAPTOP-LRAT6QCM.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=“LAPTOP-LRAT6QCM-bin”

***** 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 source or replica.#

server-id=1

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=14M

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=19M

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=37K

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

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 replica synchronizes its master.info file to disk.#

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 replica 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