MySQL notes I

1. Install MySQL
2. Remove MySQL

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

Install MySQL

Remove MySQL