Strona 1 z 1

mysql zmiana max_connections

: 10 sierpnia 2009, 18:47
autor: lukaz1987
Przetestowałem sobie MySQLTuner-em mysql-a

Kod: Zaznacz cały

-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.0.32-Debian_7etch3-log
[OK] Operating on 32-bit architecture with less than 2GB RAM

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster 
[--] Data in MyISAM tables: 6M (Tables: 53)
[!!] InnoDB is enabled but isn't being used
[!!] Total fragmented tables: 10

-------- Performance Metrics -------------------------------------------------
[--] Up for: 96d 4h 13m 24s (10M q [1.250 qps], 235K conn, TX: 3B, RX: 1B)
[--] Reads / Writes: 58% / 42%
[--] Total buffers: 58.0M global + 2.6M per thread (100 max threads)
[OK] Maximum possible memory usage: 320.5M (31% of installed RAM)
[OK] Slow queries: 0% (3/10M)
[!!] Highest connection usage: 100%  (101/100)
[OK] Key buffer size / total MyISAM indexes: 16.0M/370.0K
[OK] Key buffer hit rate: 99.9% (51M cached / 41K reads)
[OK] Query cache efficiency: 75.3% (6M cached / 8M selects)
[!!] Query cache prunes per day: 952
[OK] Sorts requiring temporary tables: 0% (0 temp sorts / 307K sorts)
[!!] Temporary tables created on disk: 45% (93K on disk / 206K total)
[OK] Thread cache hit rate: 99% (111 created / 235K connections)
[!!] Table cache hit rate: 0% (64 open / 14K opened)
[OK] Open file limit used: 10% (108/1K)
[OK] Table locks acquired immediately: 99% (4M immediate / 4M locks)

-------- Recommendations -----------------------------------------------------
General recommendations:
    Add skip-innodb to MySQL configuration to disable InnoDB
    Run OPTIMIZE TABLE to defragment tables for better performance
    Enable the slow query log to troubleshoot bad queries
    Reduce or eliminate persistent connections to reduce connection usage
    When making adjustments, make tmp_table_size/max_heap_table_size equal
    Reduce your SELECT DISTINCT queries without LIMIT clauses
    Increase table_cache gradually to avoid file descriptor limits
Variables to adjust:
    max_connections (> 100)
    wait_timeout (< 28800)
    interactive_timeout (< 28800)
    query_cache_size (> 16M)
    tmp_table_size (> 32M)
    max_heap_table_size (> 16M)
    table_cache (> 64)
I w związku z tym chciałem trochę popoprawiać. I przy zmianie max_connections z 100 na 230 i odpaleniu jeszcze raz Mysql dostaje informację, że max_connections równa się 100.

Mój config my.cnf

Kod: Zaznacz cały

#
# 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
# [url]http://dev.mysql.com/doc/mysql/en/server-system-variables.html[/url]

# 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
#
user        = mysql
pid-file    = /var/run/mysqld/mysqld.pid
socket        = /var/run/mysqld/mysqld.sock
port        = 3306
basedir        = /usr
datadir        = /var/lib/mysql
tmpdir        = /tmp
language    = /usr/share/mysql/english
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        = 128K
thread_cache_size    = 8
max_connections         = 230
#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.
#log        = /var/log/mysql/mysql.log
#
# Error logging goes to syslog. This is a Debian improvement :)
#
# 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.
#server-id        = 1
log_bin            = /var/log/mysql/mysql-bin.log
# WARNING: Using expire_logs_days without bin_log crashes the server! See README.Debian!
expire_logs_days    = 10
max_binlog_size         = 100M
#binlog_do_db        = include_database_name
#binlog_ignore_db    = include_database_name
#
# * BerkeleyDB
#
# Using BerkeleyDB is now discouraged as its support will cease in 5.1.12.
skip-bdb
#
# * 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!
# You might want to disable InnoDB to shrink the mysqld process by circa 100MB.
#skip-innodb
#
# * 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



[mysqldump]
quick
quote-names
max_allowed_packet    = 16M

[mysql]
#no-auto-rehash    # faster start of mysql but no tab completition

[isamchk]
key_buffer        = 16M

#
# * NDB Cluster
#
# See /usr/share/doc/mysql-server-*/README.Debian for more information.
#
# The following configuration is read by the NDB Data Nodes (ndbd processes)
# not from the NDB Management Nodes (ndb_mgmd processes).
#
# [MYSQL_CLUSTER]
# ndb-connectstring=127.0.0.1


#
# * IMPORTANT: Additional settings that can override those from this file!
#
!includedir /etc/mysql/conf.d/

: 14 sierpnia 2009, 02:29
autor: fnmirk
Może zacznij od przejrzenia takiej strony:
http://blog.mysqltuner.com/

To też się powinno przydać:
http://forum.slackware.pl/viewtopic.php?t=20805

: 14 sierpnia 2009, 22:53
autor: lukaz1987
fnmirk, te linki wiele mi nie pomogły. Zapuściłem test TUNING PRIMEREM

Kod: Zaznacz cały

	-- MYSQL PERFORMANCE TUNING PRIMER --
	     - By: Matthew Montgomery -

MySQL Version 5.0.32-Debian_7etch3-log i486

Uptime = 101 days 10 hrs 57 min 54 sec
Avg. qps = 1
Total Questions = 10955841
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:
[url]http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html[/url]

SLOW QUERIES
Current long_query_time = 10 sec.
You have 3 out of 10955841 that take longer than 10 sec. to complete
The slow query log is NOT enabled.
Your long_query_time may be too high, I typically set this under 5 sec.

MAX CONNECTIONS
Current max_connections = 100
Current threads_connected = 1
Historic max_used_connections = 101
The number of used connections is 101% of the configured maximum.
You should raise max_connections

WORKER THREADS
Current thread_cache_size = 8
Current threads_cached = 7
Current threads_per_sec = 0
Historic threads_per_sec = 0
Your thread_cache_size is fine

MEMORY USAGE
./Tuning-primer.sh: line 994: let: expression expected
Max Memory Ever Allocated : 269 M
Configured Max Memory Limit : 266 M
Total System Memory : 2047 M

KEY BUFFER
Current MyISAM index space = 376 K
Current key_buffer_size = 16 M
Key cache miss rate is 1 / 1247
Key buffer fill ratio = 0 %
Your key_buffer_size seems to be too high.
Perhaps you can use these resources elsewhere

QUERY CACHE
Query cache is enabled
Current query_cache_size = 16 M
Current query_cache_used = 8 M
Current Query cache fill ratio = 54.75 %

SORT OPERATIONS
Current sort_buffer_size = 2 M
Current record/read_rnd_buffer_size = 256.00 K
Sort buffer seems to be fine

JOINS
Current join_buffer_size = 128.00 K
You have had 3373 queries where a join could not use an index properly
You have had 5 joins without keys that check for key usage after each row
You should enable "log-queries-not-using-indexes"
Then look for non indexed joins in the slow query log.
If you are unable to optimize your queries you may want to increase your
join_buffer_size to accommodate larger joins in one pass.

TABLE CACHE
Current table_cache value = 64 tables
You have a total of 70 tables
You have 64 open tables.
Current table_cache hit rate is 0%, while 100% of your table cache is in use
You should probably increase your table_cache

TEMP TABLES
Current tmp_table_size = 32 M
82% of tmp tables created were disk based
Perhaps you should increase your tmp_table_size

TABLE SCANS
Current read_buffer_size = 128.00 K
Current table scan ratio = 110 : 1
read_buffer_size seems to be fine

TABLE LOCKING
Current Lock Wait ratio = 1 : 3894
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'
If you have a high concurrentcy of inserts on Dynamic row-lenght tables consider setting 'concurrent_insert=2'.
i te same informacje mi podał co MySQLTuner. I dalej nie wiem w jaki sposób zmienić wartość MAX CONNECTIONS.

: 07 marca 2010, 23:51
autor: Karol Mrozik
Wpisz w konsoli:

Kod: Zaznacz cały

locate my.cnf
  1. Sprawdź, w którym pliku masz ilość połączeń (np. /etc/mysql/my.cnf, /etc/my.cnf).
  2. Kod: Zaznacz cały

    mysql reload
  3. Wykonaj test.