MySQL, MariaDB: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.

Hi,

I use a powershell script to write some data to a MySQL Database table.

The time the script is running increases every day and the point is reached were it runs in an timeout 🙁

To increase the “connect timeout”:

  • Add the timeout=3600 directive to the connection string
    for example:  server=MySQLHost;port=3306;uid=MySQLUserName;pwd=mySecurePW;database=my_DB;connect timeout=3600
  • Increase the net_write_timeout and net_read_timeout Parameter by set it in your connection as soon as the connection is established
    @@global.net_write_timeout;
    @@global.net_read_timeout;
    Check current values

    mysql> select @@global.net_write_timeout,@@global.net_read_timeout;
    +----------------------------+---------------------------+
    | @@global.net_write_timeout | @@global.net_read_timeout |
    +----------------------------+---------------------------+
    |                         60 |                        30 |
    +----------------------------+---------------------------+
    1 row in set (0.00 sec)
    

    Set adjusted values

    set @@global.net_write_timeout = 3600;
    Query OK, 0 rows affected (0.00 sec)
    set @@global.net_read_timeout = 3600; 
    Query OK, 0 rows affected (0.00 sec)
    
  • Or set it as default in your MySQL Database instance. Add it to the mysqld section of the my.ini.

    [mysqld]
    ...
    # .Net Timeout
    net_write_timeout = 3600
    net_read_timeout = 3600
    ...
    
  • Increase command timeout. Here a Powershell example

    $oMYSQLCommand = New-Object MySql.Data.MySqlClient.MySqlCommand
    $oMYSQLCommand.Connection=$oConn
    $oMYSQLCommand.CommandText='`myStoredProcedure`'
    $oMYSQLCommand.CommandType = [System.Data.CommandType]::StoredProcedure
    $oMYSQLCommand.CommandTimeout=7200
    

Michael

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