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my server get high load from mysql server

Discussion in 'Workarounds and Optimization' started by selvamurali, Aug 4, 2011.

  1. selvamurali

    selvamurali Active Member

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    hi all i get mysql server load very high
    this is showing process list


    Pid Owner Priority CPU % Memory % Command
    26781 (Trace) (Kill) mytitbit 0 18.0 1.0 /usr/bin/php /disk1/mytitbit/public_html/user.php
    25381 (Trace) (Kill) mysql 0 17.9 2.5 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --pid-file=/var/lib/mysql/vmclouds.vmclouds.net.pid --skip-external-locking
    26764 (Trace) (Kill) mytitbit 0 16.2 0.0
    PHP:
     <defunct>
    26802 (Trace) (Kill)    mytitbit    0      14.0         0.6    /usr/bin/php /disk1/mytitbit/public_html/404error.php
    26754     (Trace) (Kill)    mytitbit    0      12.1         1.4    /usr/bin/php /disk1/mytitbit/public_html/search.php

    what to     do now
    i am running mysql tunner it will given the followning result

    [QUOTE]>>  MySQLTuner 1.1.2 - Major Hayden <major@mhtx.net>
     >>      Bug reports, feature requests, and downloads at http://mysqltuner.com/
         >>  Run with '--help' for additional options and output filtering

    -------- General Statistics --------------------------------------------------
    [--]     Skipped version check for MySQLTuner script
    [OK] Currently running supported MySQL version 5.0.92-community
    [!!] Switch to 64-bit OS - MySQL cannot currently use all of your RAM

    -------- Storage Engine Statistics -------------------------------------------
    [--]     Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
    [--] Data in MyISAM tables: 383M (Tables: 5179)
    [--]     Data in InnoDB tables: 13M (Tables: 804)
    [--]     Data in MEMORY tables: 0B (Tables: 1)
    [!!]     Total fragmented tables: 34

    -------- Performance Metrics -------------------------------------------------
    [--]     Up for: 3h 50m 57s (748K q [54.021 qps], 10K conn, TX: 860M, RX: 76M)
    [--]     Reads / Writes: 98% / 2%
    [--]     Total buffers: 34.0M global + 2.7M per thread (100 max threads)
    [    OK] Maximum possible memory usage: 302.7M (14% of installed RAM)
    [    OK] Slow queries: 0% (8/748K)
    [    OK] Highest usage of available connections: 11% (11/100)
    [    OK] Key buffer size / total MyISAM indexes: 8.0M/185.0M
    [OK] Key buffer hit rate: 99.7% (261M cached / 776K reads)
    [!!]     Query cache is disabled
    [OK] Sorts requiring temporary tables: 8% (3K temp sorts / 39K sorts)
    [!!]     Joins performed without indexes: 2978
    [!!] Temporary tables created on disk: 39% (14K on disk / 35K total)
    [!!]     Thread cache is disabled
    [!!] Table cache hit rate: 0% (64 open / 42K opened)
    [    OK] Open file limit used: 10% (107/1K)
    [    OK] Table locks acquired immediately: 99% (770K immediate / 770K locks)
    [!!]     InnoDB data size / buffer pool: 13.1M/8.0M

    -------- Recommendations -----------------------------------------------------
    General recommendations:
            Run OPTIMIZE TABLE to defragment tables for better performance
        MySQL started within last 24 hours     - recommendations may be inaccurate
        Enable the slow query log to troubleshoot bad queries
        Adjust your join queries to always utilize indexes
        When making adjustments    , make tmp_table_size/max_heap_table_size equal
        Reduce your SELECT DISTINCT queries without LIMIT clauses
        Set thread_cache_size to 4     as a starting value
        Increase table_cache gradually to avoid file descriptor limits

    Variables to adjust    :

            query_cache_size (>= 8M)
            join_buffer_size (> 128.0K, or always use indexes with joins)
            tmp_table_size (> 32M)
            max_heap_table_size (> 16M)
            thread_cache_size (start at 4)
            table_cache (> 64)
            innodb_buffer_pool_size (>= 13M)[/QUOTE]

    kindle help
     
    #1 selvamurali, Aug 4, 2011
  2. selvamurali

    selvamurali Active Member

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    can any one help me
     
    #2 selvamurali, Aug 4, 2011
  3. ramindia

    ramindia Well-Known Member

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    Hi

    kindly post your existing my.conf
     
    #3 ramindia, Aug 4, 2011
  4. selvamurali

    selvamurali Active Member

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    how i get the information of my.conf
     
    #4 selvamurali, Aug 5, 2011
  5. selvamurali

    selvamurali Active Member

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    i seen my my.cnf via ssh

    its told only one line
    [mysqld]

    there is no line after that.
    pls guide me
     
    #5 selvamurali, Aug 6, 2011
  6. cPanelTristan

    cPanelTristan Quality Assurance Analyst
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    Hello,

    If /etc/my.cnf only has that line in it, then put the following into that file:

    Code:
    [mysqld]
innodb_buffer_pool_size = 13M
max_heap_table_size = 48M
query_cache_limit = 1M
query_cache_size = 8M
query_cache_type = 1
table_cache = 80
thread_cache_size = 4
tmp_table_size = 48M
    After setting the above variables, you could then restart MySQL:

    Code:
    /etc/init.d/mysql restart
    Thanks!
     
    #6 cPanelTristan, Aug 8, 2011
  7. huggys

    huggys Registered

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    I have the same issue and I was wondering if you could take the time to look at mine as well?

    Code:
    [mysqld]
old_passwords=1
datadir=/var/lib/mysql
skip-locking
safe-show-database
tmp_table_size = 64M
max_heap_table_size = 64M
query_cache_limit=2M
query_cache_size=32M ## 32MB for every 1GB of RAM
query_cache_type=1
max_user_connections=25
max_connections=100

collation_server=utf8_unicode_ci
character_set_server=utf8

delayed_insert_timeout=40

interactive_timeout=10
wait_timeout=3600
connect_timeout=20
thread_cache_size=128
key_buffer=32M ## 32MB for every 1GB of RAM
join_buffer=1M
max_connect_errors=20
max_allowed_packet=16M
table_cache=1024
record_buffer=1M
sort_buffer_size=1M ## 1MB for every 1GB of RAM
read_buffer_size=1M ## 1MB for every 1GB of RAM
read_rnd_buffer_size=1M  ## 1MB for every 1GB of RAM
thread_concurrency=2 ## Number of CPUs x 2
myisam_sort_buffer_size=32M
server-id=1

[mysql.server]
user=mysql

[safe_mysqld]
err-log=/var/log/mysqld.log
pid-file=/var/lib/mysql/mysql.pid

[mysqldump]
quick
max_allowed_packet=16M

[mysql]
no-auto-rehash
log-slow-queries=/var/log/mysql_slow_queries.log
    Thank you!
     
    #7 huggys, Aug 8, 2011
  8. cPanelTristan

    cPanelTristan Quality Assurance Analyst
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    Hello huggys,

    If you post it into your own thread, we could look at it. It isn't normally advisable to post your issue into another thread when it's a discussion on configuring specific server options.

    If you'd like, I would be happy to move your post into your own thread.

    Thanks!
     
    #8 cPanelTristan, Aug 9, 2011
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