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    IBM Db2

    You can add Db2 databases as sources to Dremio.

    See IBM Db2 Data Types for information about mapping to Dremio data types.

    Limitations

    Only IBM Db2 for Linux, UNIX, and Windows is supported.

    Prerequisites

    1. On each node of your Dremio cluster, place a copy of the .jar file for IBM Data Server Driver For JDBC and SQLJ, version 11.5.7.0 in the folder dremio/jars/3rdparty/. After you do this on all of your nodes, restart the cluster.
    2. In Dremio, enable the support key plugins.jdbc.db2.enabled. See Support Keys.

    Configuring IBM Db2 as a Source

    1. In the bottom-left corner of the Datasets page, click Add Source.
    2. Under Databases in the Add Data Source dialog, select IBM Db2.

    General Options

    1. In the Name field, specify the name by which you want the Db2 source to appear in the Databases section.
    2. Under Connection, follow these steps:
      1. In the Host field, specify the hostname or IP address of the database to connect to.
      2. In the Port field, specify the port to use when connecting. The default is 50000.
      3. In the Database field, specify the name of the database.
    3. Under Authentication, specify the username and password for Dremio to use when connecting to the Db2 source.

    Advanced Options

    On the Advanced Options page, you can set values for these non-required options:

    Option Description
    Maximum Idle Connections The total number of connections allowed to be idle at a given time. The default maximum idle connections is 8.
    Connection Idle Time The amount of time (in seconds) allowed for a connection to remain idle before the connection is terminated. The default connection idle time is 60 seconds.
    Query Timeout The amount of time (in seconds) allowed to wait for the results of a query. If this time expires, the connection being used is returned to an idle state.

    Reflection Refresh Options

    On the Reflection Refresh page, set the policy that controls how often reflections are scheduled to be refreshed automatically, as well as the time limit after which reflections expire and are removed.

    Option Description
    Never refresh Select to prevent automatic reflection refresh, default is to automatically refresh.
    Refresh every How often to refresh reflections, specified in hours, days or weeks. This option is ignored if Never refresh is selected.
    Never expire Select to prevent reflections from expiring, default is to automatically expire after the time limit below.
    Expire after The time limit after which reflections expire and are removed from Dremio, specified in hours, days or weeks. This option is ignored if Never expire is selected.

    Metadata Options

    On the Metadata page, you can configure settings to refresh metadata and handle datasets.

    Dataset Handling

    These are the optional Dataset Handling parameters.

    Parameter Description
    Remove dataset definitions if underlying data is unavailable By default, Dremio removes dataset definitions if underlying data is unavailable. Useful when files are temporarily deleted and added back in the same location with new sets of files.

    Metadata Refresh

    These are the optional Metadata Refresh parameters:

    • Dataset Discovery: The refresh interval for fetching top-level source object names such as databases and tables. Set the time interval using this parameter.
    Parameter Description
    (Optional) Fetch every You can choose to set the frequency to fetch object names in minutes, hours, days, or weeks. The default frequency to fetch object names is 1 hour.
    • Dataset Details: The metadata that Dremio needs for query planning such as information required for fields, types, shards, statistics, and locality. These are the parameters to fetch the dataset information.
    Parameter Description
    Fetch mode You can choose to fetch only from queried datasets that are set by default. Dremio updates details for previously queried objects in a source. Fetching from all datasets is deprecated.
    Fetch every You can choose to set the frequency to fetch dataset details in minutes, hours, days, or weeks. The default frequency to fetch dataset details is 1 hour.
    Expire after You can choose to set the expiry time of dataset details in minutes, hours, days, or weeks. The default expiry time of dataset details is 3 hours.

    Privileges

    On the Privileges page, you can grant privileges to specific users or roles. See Access Controls for additional information about user privileges.

    1. (Optional) For Privileges, enter the user name or role name that you want to grant access to and click the Add to Privileges button. The added user or role is displayed in the Users table.
    2. (Optional) For the users or roles in the Users table, toggle the green checkmark for each privilege you want to grant on the Dremio source that is being created.
    3. Click Save after setting the configuration.

    Editing an IBM Db2 Source

    To edit a Db2 source:

    1. In the Datasets UI, click External Sources at the bottom-left of the page. A list of sources is displayed.
    2. Under the Action column, click the Settings (gear) icon for the source you want to edit. From the list of actions, click Edit Details. Alternatively, you can click the source and click the Settings (gear) icon of the source.
    3. In the Edit Source dialog, you cannot edit the name. Editing other parameters is optional. For parameters and advanced options, see Configuring Db2 as a Source.
    4. Click Save.

    Removing a Db2 Source

    To remove a Db2 source, perform these steps:

    1. In the Datasets UI, click External Sources at the bottom-left of the page. A list of sources is displayed.
    2. Under the Action column, click the Settings (gear) icon for the source that you want to remove.
    3. From the list of actions, click Remove Source. Confirm that you want to remove the source.

    warning:

    Removing a source causes all downstream virtual datasets dependent on objects in this source to break.

    Predicate Pushdowns

    These operations are performed by Db2.

    ||, AND, OR
    =,+, -, /, *
    <=, <, >, >=, =, <>, !=
    ABS
    ADD_MONTHS
    AVG
    BETWEEN
    CASE
    CAST
    CEIL
    CEILING
    CHAR_LENGTH
    CHARACTER_LENGTH
    COALESCE
    CONCAT
    DATE_ADD
    DATE_DIFF
    DATE_TRUNC
    DATE_TRUNC_CENTURY
    DATE_TRUNC_DAY
    DATE_TRUNC_DECADE
    DATE_TRUNC_HOUR
    DATE_TRUNC_MICROSECOND
    DATE_TRUNC_MILLENIUM
    DATE_TRUNC_MILLISECOND
    DATE_TRUNC_MINUTE
    DATE_TRUNC_MONTH
    DATE_TRUNC_QUARTER
    DATE_TRUNC_SECOND
    DATE_TRUNC_WEEK
    DATE_TRUNC_YEAR
    DAYOFMONTH
    DAYOFWEEK
    DAYOFYEAR
    EXTRACT
    FLOOR
    ILIKE
    IN
    IS DISTINCT FROM
    IS NOT DISTINCT FROM
    IS NOT NULL
    IS NULL
    LAST_DAY
    LEFT
    LENGTH
    LIKE
    LOCATE
    LOWER
    LPAD
    LTRIM
    MAX
    MIN
    MOD
    NOT
    OR
    PERCENT_RANK
    POSITION
    REPLACE
    RIGHT
    ROUND
    RPAD
    RTRIM
    SIGN
    SQRT
    STDDEV
    STDDEV_POP
    STDDEV_SAMP
    SUBSTR
    SUBSTRING
    SUM
    TO_CHAR
    TO_DATE
    TRIM
    TRUNC
    TRUNCATE
    UPPER