MySQL notes I

  • Install MySQL

  • Here are the instructions for installing MySQL on a MacOS by using homebrew.
  • First, ensure that homebrew is up to date and ready to brew
brew update
brew doctor
brew upgrade

brew update
  • Installed mysql
brew install mysql
  • Run the commands that brew suggested

Try it first:

mysql_install_db --verbose --user=`whoami` --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp

IF HAVING ERROR

mysql_install_db: [ERROR] unknown variable 'tmpdir=/tmp'

TRY THIS INSTEAD

mysqld -initialize --verbose --user=whoami --basedir="$(brew --prefix mysql)" --datadir=/usr/local/var/mysql --tmpdir=/tmp

  • Start MySQL server
mysql.server start
  • MySQL configuration
mysql_secure_installation

Add the following my.cnf file to /etc:

## The MySQL database server configuration file.
#
# You can copy this to one of:
# - "/etc/mysql/my.cnf" to set global options,
# - "~/.my.cnf" to set user-specific options.
#
# One can use all long options that the program supports.
# Run program with --help to get a list of available options and with
# --print-defaults to see which it would actually understand and use.
#
# For explanations see
# http://dev.mysql.com/doc/mysql/en/server-system-variables.html

# This will be passed to all mysql clients
# It has been reported that passwords should be enclosed with
# ticks/quotes escpecially if they contain "#" chars...
# Remember to edit /etc/mysql/debian.cnf when changing
# the socket location.
[client]
port = 3306
#socket = /var/run/mysqld/mysqld.sock

# Here is entries for some specific programs
# The following values assume you have at least 32M ram

# This was formally known as [safe_mysqld]. Both versions
# are currently parsed.
[mysqld_safe]
#socket = /var/run/mysqld/mysqld.sock
#nice = 0

[mysqld]
#
# * Basic Settings
#

#
# * IMPORTANT
# If you make changes to these settings and your system uses
# apparmor, you may also need to also adjust
# /etc/apparmor.d/usr.sbin.mysqld.
#

#user = mysql
#socket = /var/run/mysqld/mysqld.sock
port = 3306
#basedir = /usr
#datadir = /var/lib/mysql
#tmpdir = /tmp
skip-external-locking
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
bind-address = 127.0.0.1
#
# * Fine Tuning
#
key_buffer = 16M
max_allowed_packet = 16M
thread_stack = 192K
thread_cache_size = 8
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
#max_connections = 100
#table_cache = 64
#thread_concurrency = 10
#
# * Query Cache Configuration
#
query_cache_limit = 1M
query_cache_size = 16M
#
# * Logging and Replication
#
# Both location gets rotated by the cronjob.
# Be aware that this log type is a performance killer.
# As of 5.1 you can enable the log at runtime!
#general_log_file = /var/log/mysql/mysql.log
#general_log = 1

log_error = /var/log/mysql/error.log

# Here you can see queries with especially long duration
#log_slow_queries = /var/log/mysql/mysql-slow.log
#long_query_time = 2
#log-queries-not-using-indexes
#
# The following can be used as easy to replay backup logs or
# for replication.
# note: if you are setting up a replication slave, see
# README.Debian about other settings you may need
# to change.
#server-id = 1
#log_bin = /var/log/mysql/mysql-bin.log
expire_logs_days = 10
max_binlog_size = 100M
#binlog_do_db = include_database_name
#binlog_ignore_db = include_database_name
#
# * InnoDB
#
# InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/.
# Read the manual for more InnoDB related options. There are many!
#
# * Security Features
#
# Read the manual, too, if you want chroot!
# chroot = /var/lib/mysql/
#
# For generating SSL certificates I recommend the OpenSSL GUI "tinyca".
#
# ssl-ca=/etc/mysql/cacert.pem
# ssl-cert=/etc/mysql/server-cert.pem
# ssl-key=/etc/mysql/server-key.pem

# Query Caching
query-cache-type = 1

# Default to InnoDB
default-storage-engine=innodb

[mysqldump]
quick
quote-names
max_allowed_packet = 16M

[mysql]
#no-auto-rehash # faster start of mysql but no tab completition

[isamchk]
key_buffer = 16M
  • Go to MySQL console
mysql -h localhost -u root -p
  • Create database
create database dbName;
  • Create user
create user username@localhost identified by 'password';
  • Grant privilege
GRANT ALL PRIVILEGES ON newpal.* TO username@localhost WITH GRANT OPTION;

Some commands:

Restart the MySQL server

mysql.server restart

Stop MySQL server

mysql.server stop

  • Check if a MySQL instance is runnig
ps ax | grep mysql
  • Check MySQL status
mysqladmin -u root -p status
  • Changing the permission to MySQL folder. If you are working locally, you can try:
sudo chmod -R 755 /var/lib/mysql/
  • Export MySQL DB
    mysqldump -u dbName1 -p dbName2 > fileName.sql

Note: The .sql file might be large. You may gzip it and then use sftp to get it back

  • Import MySQL DB
mysql -h ip_address -u username -p dbName < fileName.sql
  • Remove MySQL

brew remove mysql

brew cleanup --force

launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

rm ~/Library/LaunchAgents/homebrew.mxcl.mysql.plist

sudo rm -rf /usr/local/var/mysql