'Copying to Tmp Table' in mysql after converting to InnoDB

Posted on 2008-11-19
Last Modified: 2012-05-05

I have converted my main table to Innodb from MyIsam to improve db speed (locking issues).
Since doing so my macing is grinding to a halt, when looking at the connections most of then seem to say 'Copying to tmp table'. Im assuming this is a disk based table and as a result is slowing down the process. I cant understand why the Server is doing this.

Is is a memory allocation issue? (I have reinstalled my server with a high volume setting)
A Query issue? (It happens on most queries, but didnt when I used a MyIsam table)

I have searched google to see why 'copying to tmp table' happens but have not got any answers.

Please help..
My servers dying!
Question by:jellydeal
    LVL 17

    Assisted Solution

    > most of then seem to say 'Copying to tmp table'. Im assuming this is a disk based table and as a result is slowing down the process.
    > I cant understand why the Server is doing this.

    The server gets into the `copying to tmp table` message when MySQL is manipulating the data. If it takes too long, that usually means that the query is too slow (e.g. not having correct indexes, etc). Try checking your queries with EXPLAIN SELECT to see how they use your indexes.
    LVL 26

    Expert Comment

    "Copying to tmp table" - The server is copying to a temporary table in memory. .. I'm agree with  "leannonn"  on tuning queries at first place.

    Please monitor these (if not enabled pls do so) -- need to set in my.cnf
    1. Queries not using indexes
    2. Slow queries

    Also could you brief me about
    - is this serve dedicated to MySQL?
    - RAM
    - How much InnoDB/MyISAM tables used?
    - post your my.cnf
    - post output of below statements
      show global status;
      show global variables;



    Author Comment

    Hi Ushastry,

    The machine is running IIS and MySQL 5 server. I am serving one website that does get quite a lot of traffic. Approx 300,000 pages (majority dadabase driven).

    Here is the info you asked for, hope you can shine a light on it..

    thanks agin,

    CPU INTEL 6600 * 2 @ 2.6Ghz
    MEM 2 Gig
    OS  Win 2003 Server
    WEB IIS inc ASP
    MYSQL V5.1.11

    MYISAM 1 Table - total 500k - index 85k
    InnoDB 40 Tables - total 800 Meg - index 2 Gig
    # MySQL Server Instance Configuration File
    # ----------------------------------------------------------------------
    # Generated by the MySQL Server Instance Configuration Wizard
    # Installation Instructions
    # ----------------------------------------------------------------------
    # On Linux you can copy this file to /etc/my.cnf to set global options,
    # mysql-data-dir/my.cnf to set server-specific options
    # (@localstatedir@ for this installation) or to
    # ~/.my.cnf to set user-specific options.
    # On Windows you should keep this file in the installation directory
    # of your server (e.g. C:\Program Files\MySQL\MySQL Server X.Y). To
    # make sure the server reads the config file use the startup option
    # "--defaults-file".
    # To run run the server from the command line, execute this in a
    # command line shell, e.g.
    # mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"
    # To install the server as a Windows service manually, execute this in a
    # command line shell, e.g.
    # mysqld --install MySQLXY --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"
    # And then execute this in a command line shell to start the server, e.g.
    # net start MySQLXY
    # Guildlines for editing this file
    # ----------------------------------------------------------------------
    # In this file, you can use all long options that the program supports.
    # If you want to know the options a program supports, start the program
    # with the "--help" option.
    # More detailed information about the individual options can also be
    # found in the manual.
    # ----------------------------------------------------------------------
    # The following options will be read by MySQL client applications.
    # Note that only client applications shipped by MySQL are guaranteed
    # to read this section. If you want your own MySQL client program to
    # honor these values, you need to specify it as an option during the
    # MySQL client library initialization.




    # ----------------------------------------------------------------------
    # The following options will be read by the MySQL Server. Make sure that
    # you have installed the server correctly (see above) so it reads this
    # file.

    # The TCP/IP Port the MySQL Server will listen on

    #Path to installation directory. All paths are usually resolved relative to this.
    basedir="E:/Program Files/MySQL/MySQL Server 5.0_INNODB/"

    #Path to the database root
    datadir="E:/Program Files/MySQL/MySQL Server 5.0_INNODB/Data/"

    # The default character set that will be used when a new schema or table is
    # created and no character set is defined

    # The default storage engine that will be used when create new tables when

    # Set the SQL mode to strict

    # The maximum amount of concurrent sessions the MySQL server will
    # allow. One of these connections will be reserved for a user with
    # SUPER privileges to allow the administrator to login even if the
    # connection limit has been reached.

    # Query cache is used to cache SELECT results and later return them
    # without actual executing the same query once again. Having the query
    # cache enabled may result in significant speed improvements, if your
    # have a lot of identical queries and rarely changing tables. See the
    # "Qcache_lowmem_prunes" status variable to check if the current value
    # is high enough for your load.
    # Note: In case your tables change very often or if your queries are
    # textually different every time, the query cache may result in a
    # slowdown instead of a performance improvement.

    # The number of open tables for all threads. Increasing this value
    # increases the number of file descriptors that mysqld requires.
    # Therefore you have to make sure to set the amount of open files
    # allowed to at least 4096 in the variable "open-files-limit" in
    # section [mysqld_safe]

    # Maximum size for internal (in-memory) temporary tables. If a table
    # grows larger than this value, it is automatically converted to disk
    # based table This limitation is for a single table. There can be many
    # of them.

    # How many threads we should keep in a cache for reuse. When a client
    # disconnects, the client's threads are put in the cache if there aren't
    # more than thread_cache_size threads from before.  This greatly reduces
    # the amount of thread creations needed if you have a lot of new
    # connections. (Normally this doesn't give a notable performance
    # improvement if you have a good thread implementation.)

    #*** MyISAM Specific options

    # The maximum size of the temporary file MySQL is allowed to use while
    # recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE.
    # If the file-size would be bigger than this, the index will be created
    # through the key cache (which is slower).

    # If the temporary file used for fast index creation would be bigger
    # than using the key cache by the amount specified here, then prefer the
    # key cache method.  This is mainly used to force long character keys in
    # large tables to use the slower key cache method to create the index.

    # If the temporary file used for fast index creation would be bigger
    # than using the key cache by the amount specified here, then prefer the
    # key cache method.  This is mainly used to force long character keys in
    # large tables to use the slower key cache method to create the index.

    # Size of the Key Buffer, used to cache index blocks for MyISAM tables.
    # Do not set it larger than 30% of your available memory, as some memory
    # is also required by the OS to cache rows. Even if you're not using
    # MyISAM tables, you should still set it to 8-64M as it will also be
    # used for internal temporary disk tables.

    # Size of the buffer used for doing full table scans of MyISAM tables.
    # Allocated per thread, if a full scan is needed.

    # This buffer is allocated when MySQL needs to rebuild the index in
    # REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE
    # into an empty table. It is allocated per thread so be careful with
    # large settings.

    #*** INNODB Specific options ***

    # Use this option if you have a MySQL server with InnoDB support enabled
    # but you do not plan to use it. This will save memory and disk space
    # and speed up some things.

    # Additional memory pool that is used by InnoDB to store metadata
    # information.  If InnoDB requires more memory for this purpose it will
    # start to allocate it from the OS.  As this is fast enough on most
    # recent operating systems, you normally do not need to change this
    # value. SHOW INNODB STATUS will display the current amount used.

    # If set to 1, InnoDB will flush (fsync) the transaction logs to the
    # disk at each commit, which offers full ACID behavior. If you are
    # willing to compromise this safety, and you are running small
    # transactions, you may set this to 0 or 2 to reduce disk I/O to the
    # logs. Value 0 means that the log is only written to the log file and
    # the log file flushed to disk approximately once per second. Value 2
    # means the log is written to the log file at each commit, but the log
    # file is only flushed to disk approximately once per second.

    # The size of the buffer InnoDB uses for buffering log data. As soon as
    # it is full, InnoDB will have to flush it to disk. As it is flushed
    # once per second anyway, it does not make sense to have it very large
    # (even with long transactions).

    # InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and
    # row data. The bigger you set this the less disk I/O is needed to
    # access data in tables. On a dedicated database server you may set this
    # parameter up to 80% of the machine physical memory size. Do not set it
    # too large, though, because competition of the physical memory may
    # cause paging in the operating system.  Note that on 32bit systems you
    # might be limited to 2-3.5G of user level memory per process, so do not
    # set it too high.

    # Size of each log file in a log group. You should set the combined size
    # of log files to about 25%-100% of your buffer pool size to avoid
    # unneeded buffer pool flush activity on log file overwrite. However,
    # note that a larger logfile size will increase the time needed for the
    # recovery process.

    # Number of threads allowed inside the InnoDB kernel. The optimal value
    # depends highly on the application, hardware as well as the OS
    # scheduler properties. A too high value may lead to thread thrashing.
    #Enter a name for the slow query log. Otherwise a default name will be used.
    #Enter a name for the error log file. Otherwise a default name will be used.
    #Method used for flushing the log files to disk.
    #Enter a name for the query log file. Otherwise a default name will be used.
    #Path to the temporary directory.

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    LVL 26

    Accepted Solution


    >>The machine is running IIS and MySQL 5 server. I am serving one website that does get quite a lot of traffic. Approx 300,000 pages (majority database driven).

    I'll look into the details provided by you & ell you anything needed to be change.
    BTW, I won't suggest you to run MySQL and IIS on same machine ..and lastly I never had a chance to hear from anyone about MySQL's performance on Windows platform...

    Just a thought

    innodb_buffer_pool_size=1000M ----> 1G

    Normally when it's assumed that setting 60-80% total RAM to innodb_buffer_pool_size is good but you can't do it at the moment as again the questions comes if you allow more memory to it then what about OS and IIS???   also I see you have assigned 150M to key_buffer_size which is shouldn't be thr or should  be less if you are not going to use MyISAM at all.


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