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From:John G. Heim Date:January 25 2010 9:53pm
Subject:optimization
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I have a server with 16Gb of RAM and a dual-core  2Ghz processor.  It is
running the latest mysql-server from debian lenny (5.0.1). I have databases
for drupal, moodle, spamassassin, horde3, and a small database for
departmental stuff.

The problem is that inserts/updates are sometimes very slow, on the order of
a minute. I am hoping somebody can sspot something wrong in my config.
Here's the optimization settings section (for your convenience). The whole
my.cnf is reproduced below that:

key_buffer = 256M
max_allowed_packet = 16M
max_connections=2000
myisam_sort_buffer_size = 64M
open_files_limit = 8192
query_cache_min_res_unit= 2K
query_cache_size= 36M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
sort_buffer_size = 1M
table_cache = 512
thread_cache = 32
thread_cache_size = 8
thread_concurrency = 8

---
# 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 /var/lib/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  = /var/run/mysqld/mysqld.sock

# Here follows entries for some specific programs

# The MySQL server
[mysqld]
log_slow_queries = /var/log/mysql/mysql-slow.log
long_query_time = 2
#log-queries-not-using-indexes

port  = 3306
socket  = /var/run/mysqld/mysqld.sock
skip-locking

#wait_timeout=14400
key_buffer = 256M
max_allowed_packet = 16M
max_connections=2000
myisam_sort_buffer_size = 64M
open_files_limit = 8192
query_cache_min_res_unit= 2K
query_cache_size= 36M
read_buffer_size = 1M
read_rnd_buffer_size = 4M
sort_buffer_size = 1M
table_cache = 512
thread_cache = 32
thread_cache_size = 8
thread_concurrency = 8

# 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=mysql-bin
expire_logs_days        = 10
max_binlog_size         = 100M


# 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=mysql-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/lib/mysql/
#innodb_log_arch_dir = /var/lib/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 = 256M
#innodb_additional_mem_pool_size = 20M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 64M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M
#comments = true
#compact = true

[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


Thread
optimizationJohn G. Heim25 Jan
  • Re: optimizationJaime Crespo Rinc√≥n26 Jan
  • Re: optimizationJohn G. Heim26 Jan
    • Re: optimizationmos26 Jan
      • Re: optimizationKeith Murphy26 Jan
  • Re: optimizationJohn G. Heim26 Jan
    • Re: optimizationKeith Murphy26 Jan
      • Re: optimizationKyong Kim27 Jan