Configuration - MyDumper documentation

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# Configuration

We kept the main configuration of MyDumper in /etc/mydumper.cnf by default.

## --defaults-file

We kept relevant configuration in it as you can find sections like:

    [mydumper]
    [mydumper_session_variables]
    [myloader]
    [myloader_session_variables]

Where we kept the defaults when mydumper and myloader is executed and the default session level variables. In case of [myloader_session_variables] we have this defaults:

    [myloader_session_variables]
    SQL_MODE='NO_AUTO_VALUE_ON_ZERO' /*!40101
    UNIQUE_CHECKS=0 /*!40114
    FOREIGN_KEY_CHECKS=0 /*!40114

Which is replaced when you connect to MariaDB:

    [myloader_session_variables_mariadb]
    # This setting replaces the default in the section [myloader_session_variables]. More details in #987
    SQL_MODE='NO_AUTO_VALUE_ON_ZERO' /*!40101
    UNIQUE_CHECKS=1 /*!40114
    FOREIGN_KEY_CHECKS=0 /*!40114

## --defaults-extra-file

We recommend you to use for `[`database`.`table`]` sections, in which you can add this options:

- where: receives a comparasion compatible with the table definition.

- limit: which receives a number and forces the select statement to do not read more reads if it reaches the limit.

- num_threads: Defines the amount of threads that will be used for the table.

- object_to_export: It receives a comma delimited list with this options: SCHEMA, DATA, TRIGGER, ALL and NONE. ALL is equal to SCHEMA,DATA,TRIGGER.

- columns_on_select: the list of columns in the SELECT statement will be replace by the content of this parameter.

- columns_on_insert: The columns in the INSERT statemnt will be replace by the content of this parameter.

- object_to_export: It receives a comma delimited list with this options: SCHEMA, DATA, TRIGGER, ALL and NONE. ALL is equal to SCHEMA,DATA,TRIGGER.

- partition_regex: Defines a regular expression to filter the partitions to export

For example:

    where = column > 20
    limit = 1000
    object_to_export = SCHEMA
    columns_on_select = qty,price+20
    columns_on_insert = qty,price