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MySQL Optimization

Discussion in 'Database Discussions' started by arksalot, Aug 21, 2013.

  1. arksalot

    arksalot Registered

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    Hi,

    I Know there are lot of Threads giving details about MySQL optimization. But I still find some difficulties with this !!!!

    While executing the script /usr/local/cpanel/3rdparty/mysqltuner/mysqltuner.pl I get the following result :

    Code:
    Name "XML::Simple::PREFERRED_PARSER" used only once: possible typo at /usr/local/cpanel/3rdparty/mysqltuner/mysqltuner.pl line 148.
    
     >>  MySQLTuner 1.2.0_1 - Major Hayden <major@mhtx.net>
     >>  Bug reports, feature requests, and downloads at [url]http://mysqltuner.com/[/url]
     >>  Run with '--help' for additional options and output filtering
    
    -------- General Statistics --------------------------------------------------
    [--] Skipped version check for MySQLTuner script
    [OK] Currently running supported MySQL version 5.1.70-cll
    [OK] Operating on 64-bit architecture
    
    -------- Storage Engine Statistics -------------------------------------------
    [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster
    [--] Data in MyISAM tables: 1G (Tables: 6755)
    [--] Data in InnoDB tables: 125M (Tables: 1350)
    [--] Data in MEMORY tables: 0B (Tables: 31)
    [!!] Total fragmented tables: 50
    
    -------- Performance Metrics -------------------------------------------------
    [--] Up for: 22h 35m 48s (5M q [61.618 qps], 127K conn, TX: 23B, RX: 840M)
    [--] Reads / Writes: 95% / 5%
    [--] Total buffers: 34.0M global + 2.7M per thread (151 max threads)
    [OK] Maximum possible memory usage: 449.2M (5% of installed RAM)
    [OK] Slow queries: 0% (233/5M)
    [OK] Highest usage of available connections: 51% (78/151)
    [OK] Key buffer size / total MyISAM indexes: 8.0M/270.1M
    [OK] Key buffer hit rate: 96.3% (84M cached / 3M reads)
    [!!] Query cache is disabled
    [OK] Sorts requiring temporary tables: 0% (6 temp sorts / 676K sorts)
    [!!] Joins performed without indexes: 19631
    [!!] Temporary tables created on disk: 39% (337K on disk / 845K total)
    [!!] Thread cache is disabled
    [!!] Table cache hit rate: 0% (64 open / 4M opened)
    [OK] Open file limit used: 0% (127/47K)
    [OK] Table locks acquired immediately: 99% (5M immediate / 5M locks)
    [!!] InnoDB data size / buffer pool: 125.2M/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 (> 16M)
        max_heap_table_size (> 16M)
        thread_cache_size (start at 4)
        table_cache (> 64)
        innodb_buffer_pool_size (>= 125M)'
    
    But when I check the MySQL configuration file /etc/my.cnf
    I could only see the following :

    [mysqld]
    innodb_file_per_table=1
    open_files_limit=47760

    Can anybody just help me to sort out why is it so ?

    Regards,
    Arun Kurian
     
  2. Infopro

    Infopro cPanel Sr. Product Evangelist
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  3. arksalot

    arksalot Registered

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    Hey Thanks for your advice....

    Now I am facing the following Issues in Optimizing:

    Code:
    [!!] Key buffer hit rate: 85.6% (527 cached / 76 reads)
    [!!] Query cache is disabled
    [!!] Temporary tables created on disk: 37% (3 on disk / 8 total)
    [!!] Thread cache is disabled
    
    -------- 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
        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
    Variables to adjust:
        query_cache_size (>= 8M)
        tmp_table_size (> 16M)
        max_heap_table_size (> 16M)
        thread_cache_size (start at 4)
    My my.cnf is as follows :

    Code:
    # Here follows entries for some specific programs
    
    # The MySQL server
    [mysqld]
    port            = 3306
    socket          = /var/lib/mysql/mysql.sock
    skip-locking
    key_buffer_size = 190M
    max_allowed_packet = 1M
    table_open_cache = 64
    sort_buffer_size = 512K
    net_buffer_length = 8K
    read_buffer_size = 256K
    read_rnd_buffer_size = 512K
    myisam_sort_buffer_size = 8M
    
    # 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
    
    # binary logging format - mixed recommended
    binlog_format=mixed
    
    # 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
    
    # 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
    # You can set .._buffer_pool_size up to 50 - 80 %
    # of RAM but beware of setting memory usage too high
    innodb_buffer_pool_size = 16M
    innodb_additional_mem_pool_size = 2M
    # Set .._log_file_size to 25 % of buffer pool size
    innodb_log_file_size = 5M
    innodb_log_buffer_size = 8M
    innodb_flush_log_at_trx_commit = 1
    innodb_lock_wait_timeout = 50
    
    [mysqldump]
    quick
    max_allowed_packet = 16M
    
    [mysql]
    no-auto-rehash
    # Remove the next comment character if you are not familiar with SQL
    #safe-updates
    
    [myisamchk]
    key_buffer_size = 20M
    sort_buffer_size = 20M
    read_buffer = 2M
    write_buffer = 2M
    
    [mysqlhotcopy]
    interactive-timeout
    How do I fix the above mentioned Issues ?
     
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