Hallo, ich hätte gerne etwas Hilfe bei der Optimierung eines MySQL Servers. Letztens hatte ich das erste mal einen Absturz einer Datenbank und da bin ich mal auf die Suche gegangen nach dem möglichen Fehler.
Auf dem Server laufen drei Foren . Eines davon hat so 6000 Besucher am Tag.
Einige Werte von Tuning Primer machen mir ein wenig Sorgen.
Ausgabe Tuning Primer:
Der Rechner hat Ram ohne Ende sowie 8 Cores und da soll demnächst noch ein großes Forum mit 10.000 Besuchern am Tag rauf aber erst mal die kleinen Probleme lösen.
Hier die my.cnf
Mag da einer der Experten mal einen Blick drauf werfen und seine Meinung dazu sagen.
Vielen Dank
Auf dem Server laufen drei Foren . Eines davon hat so 6000 Besucher am Tag.
Einige Werte von Tuning Primer machen mir ein wenig Sorgen.
Ausgabe Tuning Primer:
Code:
MySQL Version 5.1.58-1ubuntu1 x86_64
Uptime = 2 days 9 hrs 46 min 0 sec
Avg. qps = 47
Total Questions = 9864543
Threads Connected = 1
Server has been running for over 48hrs.
It should be safe to follow these recommendations
To find out more information on how each of these
runtime variables effects performance visit:
http://dev.mysql.com/doc/refman/5.1/en/server-system-variables.html
Visit http://www.mysql.com/products/enterprise/advisors.html
for info about MySQL's Enterprise Monitoring and Advisory Service
SLOW QUERIES
The slow query log is NOT enabled.
Current long_query_time = 10.000000 sec.
You have 0 out of 9864564 that take longer than 10.000000 sec. to complete
Your long_query_time seems to be fine
BINARY UPDATE LOG
The binary update log is NOT enabled.
You will not be able to do point in time recovery
See http://dev.mysql.com/doc/refman/5.1/en/point-in-time-recovery.html
WORKER THREADS
Current thread_cache_size = 16
Current threads_cached = 7
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine
MAX CONNECTIONS
Current max_connections = 150
Current threads_connected = 1
Historic max_used_connections = 17
The number of used connections is 11% of the configured maximum.
Your max_connections variable seems to be fine.
INNODB STATUS
Current InnoDB index space = 0 bytes
Current InnoDB data space = 0 bytes
Current InnoDB buffer pool free = 99 %
Current innodb_buffer_pool_size = 1.00 G
Depending on how much space your innodb indexes take up it may be safe
to increase this value to up to 2 / 3 of total system memory
MEMORY USAGE
Max Memory Ever Allocated : 3.24 G
Configured Max Per-thread Buffers : 2.11 G
Configured Max Global Buffers : 3.00 G
Configured Max Memory Limit : 5.11 G
Physical Memory : 31.40 G
Max memory limit seem to be within acceptable norms
KEY BUFFER
Current MyISAM index space = 398 M
Current key_buffer_size = 1.00 G
Key cache miss rate is 1 : 1344
Key buffer free ratio = 77 %
Your key_buffer_size seems to be fine
QUERY CACHE
Query cache is enabled
Current query_cache_size = 1.00 G
Current query_cache_used = 225 M
Current query_cache_limit = 4 M
Current Query cache Memory fill ratio = 22.01 %
Current query_cache_min_res_unit = 2 K
Your query_cache_size seems to be too high.
Perhaps you can use these resources elsewhere
MySQL won't cache query results that are larger than query_cache_limit in size
SORT OPERATIONS
Current sort_buffer_size = 2 M
Current read_rnd_buffer_size = 256 K
Sort buffer seems to be fine
JOINS
Current join_buffer_size = 8.00 M
You have had 9393 queries where a join could not use an index properly
join_buffer_size >= 4 M
This is not advised
You should enable "log-queries-not-using-indexes"
Then look for non indexed joins in the slow query log.
OPEN FILES LIMIT
Current open_files_limit = 10160 files
The open_files_limit should typically be set to at least 2x-3x
that of table_cache if you have heavy MyISAM usage.
Your open_files_limit value seems to be fine
TABLE CACHE
Current table_open_cache = 5000 tables
Current table_definition_cache = 2000 tables
You have a total of 992 tables
You have 1050 open tables.
The table_cache value seems to be fine
TEMP TABLES
Current max_heap_table_size = 64 M
Current tmp_table_size = 64 M
Of 403900 temp tables, 16% were created on disk
Created disk tmp tables ratio seems fine
TABLE SCANS
Current read_buffer_size = 4 M
Current table scan ratio = 14952 : 1
read_buffer_size seems to be fine
TABLE LOCKING
Current Lock Wait ratio = 1 : 59
You may benefit from selective use of InnoDB.
If you have long running SELECT's against MyISAM tables and perform
frequent updates consider setting 'low_priority_updates=1'Der Rechner hat Ram ohne Ende sowie 8 Cores und da soll demnächst noch ein großes Forum mit 10.000 Besuchern am Tag rauf aber erst mal die kleinen Probleme lösen.
Hier die my.cnf
Code:
#
# 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 = 256M
max_allowed_packet = 64M
thread_stack = 192K
thread_cache_size = 16
# This replaces the startup script and checks MyISAM tables if needed
# the first time they are touched
myisam-recover = BACKUP
max_connections = 150
table_cache = 5000
table_definition_cache = 2000
thread_concurrency = 8
read_buffer_size = 4M
join_buffer_size = 8M
concurrent_insert=2
query_cache_min_res_unit = 2K
#
# * Query Cache Configuration
#
query_cache_limit = 4M
query_cache_size = 1G
#
# * 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
max_heap_table_size = 64M
tmp_table_size = 64M
#low_priority_updates=1
innodb_buffer_pool_size = 1G
key_buffer_size = 1G
[mysqldump]
quick
quote-names
max_allowed_packet = 16M
[mysql]
#no-auto-rehash # faster start of mysql but no tab completition
[isamchk]
key_buffer = 16M
#
# * IMPORTANT: Additional settings that can override those from this file!
# The files must end with '.cnf', otherwise they'll be ignored.
#
!includedir /etc/mysql/conf.d/Mag da einer der Experten mal einen Blick drauf werfen und seine Meinung dazu sagen.
Vielen Dank
