Replying to Sample My.cnf - MySQL Configuration File

innodb_log_group_home_dir = /var/log/innodblogs/ issueSample My.cnf - MySQL Configuration File

hey ,

Thanks  for the excellent doc but I am facing one issue that when I add innodb_log_group_home_dir = /var/log/innodblogs/

in my my.Cnf then the mysqld service is not restarting .

Uncommenting the line makes the service restart in proper fashion.

Can u help me out or any suggestions ??

Thanks in advance

Rak

by default mysql uses MyISAM tables. You have to specify if you want something else.  If you are setting up a test environment you don't really need to edit the my.cnf file.  Otherwise thanks this should help some people out.

<{POST_SNAPBACK}>

Yaah, you are right. By default all the tables setup by MySQL are in the ISAM format unless explicitly specified otherwise. But as I said, this sample is to get you started with a decent working .cnf file - but configured for really heavy MySQL usage - I think I'm going to get back pretty soon with explanations of each syntax and what specific changes they bring to your system. That should help everyone to configure it according to their needs.

Till then....

by default mysql uses MyISAM tables. You have to specify if you want something else. If you are setting up a test environment you don't really need to edit the my.cnf file. Otherwise thanks this should help some people out.

Hi all,
Recently there has been lots of questions about configuring MySQL. Usually the rpm comes with a few sample MySQL config files, but here I'm providing you with a fully working one for your reference. Feel free to modify it to suit your needs.

One word: My MySQL is configured to use only large InnoDB Databases, because of the large volume of transactions it handles. You'll find a reflection of that in the my.cnf... Most home users would use ISAM DB instead. So make the suitable modifications before you use...

Sample "my.cnf"

#---------------------------------------------------------------------------
# Example MySQL config file for large systems.
#
# This is for a large system with memory = 512M where the system runs mainly
# MySQL.
#
# 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 @localstatedir@) 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  = 8008
socket  = /var/lib/mysql/mysql.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port  = 8008
socket  = /var/lib/mysql/mysql.sock
skip-locking

# Caches and Buffer Sizes
key_buffer = 256M
max_allowed_packet=16M
table_cache = 256
sort_buffer_size = 2M
read_buffer_size = 2M
read_rnd_buffer_size = 4M
record_buffer = 1M
myisam_sort_buffer_size = 128M
thread_cache = 128
query_cache_limit = 2M
query_cache_type = 1
query_cache_size = 32M
key_buffer = 16M
join_buffer = 2M
table_cache = 1024

#Time Outs
interactive_timeout = 100
wait_timeout = 100
connect_timeout = 10

# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 2

# Maximum connections allowed
max_connections = 500
max_user_connections = 50
max_connect_errors = 10

# 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

# 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 = 64M
#bdb_max_lock = 100000

# Uncomment the following if you are using InnoDB tables
innodb_data_home_dir = /var/lib/mysql/
innodb_data_file_path = ibdata1:10M:autoextend
innodb_log_group_home_dir = /var/log/innodblogs/
innodb_log_arch_dir = /var/log/innodblogsarchive/
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
innodb_buffer_pool_size = 160M
innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
innodb_log_file_size = 40M
innodb_log_buffer_size = 8M
innodb_flush_log_at_trx_commit = 1
innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[safe_mysqld]
#err-log=/var/log/mysqld.log
#pid-file=/var/lib/mysql/mysql.pid <-- Not necessary
open_files_limit=8192


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

[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout/log
#------------------------------------------------------------------------------------------