/etc/my.cnf

Als gute Grundlage kopiert man das entsprechende Beispielskonfig nach /etc/my.cnf:

my-huge.cnf	Für sehr grosse Datenbank Systeme mit 1-2Gb Memory (DB) wo hauptsächlich MySQL läuft
my-innodb-heavy-4G.cnf	Für sehr grosse Systeme mit 4Gb Memory (DB) die nur InnoDB und komplexe Queries abarbeiten muss
my-large.cnf	Für ein grosses System mit 512Mb Memory (DB) auf dem hauptsächlich MySQL läuft
my-medium.cnf	Für Systeme, die wenig Memory für die Datenbank brauchen (32M-64M), wo MySQL eine wichtige Rolle spielt (z.B. Webserver)
my-small.cnf	Für Systeme mit sehr wenig Memory Benutzung für die Datenbank (<=64M), wo MySQL nur ab und zu benutzt wird.

Für meine Bedürfnisse reicht in der Regel die my-medium.cnf.

 cp /usr/local/share/mysql/my-medium.cnf /etc/my.cnf

Folgende Änderungen sollten unter dem Abschnitt [mysqld] gemacht werden:

log-error = /var/log/mysql-startup.log

Sofern man keine Datenbank replication benutzt, sollte man sämtliches anders Logging abschalten:

# log-bin       # binary log
# log           # normal log

Falls man einen Multiprozessor (SMP) Server hat, kann man folgenden Eintrag hinzufügen:

# Try number of CPU's*2 for thread_concurrency
set-variable    = thread_concurrency=4

Den Key-Buffer kann man von 16 auf 128Mb erhöhen:

key_buffer              = 128M

Man erstelle noch das notwenige Logfile:

touch /var/log/mysql-startup.log
chown mysql:mysql /var/log/mysql-startup.log

Und starte anschliessend den MySQL Server neu:

-su-2.05b# /usr/local/etc/rc.d/mysql-server.sh restart
Stopping mysql.
Waiting for PIDS: 29031, 29031.
Starting mysql.
-su-2.05b#

Und so sieht am schluss das ganze File aus:

# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#
# You can copy this file to
# /etc/my.cnf to set global options,
# mysql-data-dir/my.cnf to set server-specific options (in this
# installation this directory is /var/db/mysql) or
# ~/.my.cnf to set user-specific options.
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
#password       = your_password
port            = 3306
socket          = /tmp/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port            = 3306
socket          = /tmp/mysql.sock
skip-locking
key_buffer              = 128M
max_allowed_packet      = 1M
table_cache             = 64
sort_buffer_size        = 512K
net_buffer_length       = 8K
read_buffer_size        = 256K
read_rnd_buffer_size    = 512K
myisam_sort_buffer_size = 8M

# Try number of CPU's*2 for thread_concurrency
set-variable    = thread_concurrency=4

# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
# 
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
# log-bin       # binary log
# log           # normal log

# just log errors
log-error = /var/log/mysql-startup.log

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id       = 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin

# Point the following paths to different dedicated disks
#tmpdir         = /tmp/         
#log-update     = /path-to-dedicated-directory/hostname

# Uncomment the following if you are using BDB tables
#bdb_cache_size = 4M
#bdb_max_lock = 10000

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /var/db/mysql/
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /var/db/mysql/
#innodb_log_arch_dir = /var/db/mysql/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[isamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout