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    Microsoft Azure Synapse Analytics

    Dremio supports integrations with organizations using Azure Synapse Analytics dedicated SQL pools via the external source.

    Requirements

    Source Dialog

    General tab

    The following options are available from the General tab.

    • Name - A name to identify the data source in Dremio.
    • Connection
      • Host - The URL for your dedicated SQL pool, which typically ends in .sql.azuresynapse.net.
      • Port - The port required to access the data source.
      • Database (optional) - The database’s name. Only this database is accessed by Dremio.
    • Authentication
      • No Authentication - Dremio does not attempt to provide any authentication when connecting with the SQL pool.
      • Master Credentials - Dremio must provide a specified username and password in order to access the SQL pool.
        • Username - The username with sufficient privileges to perform read/write actions on the SQL pool.
        • Password - The password associated with the username.
      • Encrypt connection - The connection is attempted using HTTPS encryption if enabled.

    Advanced Options tab

    The following settings control more advanced functionalities in Dremio.

    • Advanced Options
      • Show only the initial database used for connecting - This restricts Dremio’s access only to a default database as specified on the General table.
      • Record fetch size - Number of records to fetch at once. Set to 0 (zero) to have Dremio automatically decide. The default value is 10.
      • Maximum idle connections - The maximum number of idle connections to keep.
      • Connection idle time (s) - Idle time, in seconds, before a connection is considered for closure.
      • Query timeout (s) - The timeout, in seconds, for query execution before it is canceled. Set to 0 for no timeout.
    • Encryption
      • Verify server certificate - Forces Dremio to verify the server’s certificate using the distinguished name.
      • SSL/TLS server certificate distinguished name - Specifies the location for the certificate server, which must be set to *.sql.azuresynapse.net.
    • Connection Properties
      • Name - The unique name for any custom properties.
      • Value - The value associated with the custom property.

    Reflection Refresh tab

    This tab controls the frequency of reflection refreshes or the timespan for expiration for any queries performed using this data source.

    • Never refresh - Prevents any query reflections associated with this source from refreshing.
    • Refresh every - Sets the time interval by which reflections for this source are refreshed. This may be set to hours, days, and weeks.
    • Never expire - Prevents any query reflections associated with this source from expiring.
    • Expire after - Sets the time after a reflection is created that it then expires and can no longer be used for queries. This may be set to hours, days, and weeks.

    Metadata tab

    This tab offers settings that control how dataset details are fetched and refreshed.

    • Dataset Handling
      • Remove dataset definitions if underlying data is unavailable - If this box is not checked and the underlying files under a folder are removed or the folder/source is not accessible, Dremio does not remove the dataset definitions. This option is useful in cases when files are temporarily deleted and put back in place with new sets of files.
    • Metadata Refresh
      • Dataset Discovery
        • Fetch every - Specifies the time interval by which Dremio fetches object names. This can be set by minutes, hours, days, and weeks.
      • Dataset Details
        • Fetch mode - Restricts when metadata is retrieved.
        • Fetch every - Specifies the time interval by which metadata is fetched. This can be set by minutes, hours, days, and weeks.
        • Expire after - Specifies the timespan for when dataset details expire after a dataset is queried. This can be set by minutes, hours, days, and weeks.

    Privileges tab

    From this tab, administrators may control access to the data source on a user-by-user or group-by-group basis.

    For additional information view the Users, Groups, and Roles page. If you’re using Dremio v16.0+, then please view the new Access Control functionality.

    Adding Synapse Analytics as a Source

    To connect with Azure Synapse Analytics data sources, perform the following steps:

    1. From the Dremio console, click the Add button (plus sign) next to the External Sources header from the Home page.
    2. Select the source option Microsoft Azure Synapse Analytics.
    3. Assign a Name to your source to identify it.
    4. Enter the URL Host where your dedicated SQL pool is located (e.g., synapse-test.sql.azuresynapse.net) and the Port (e.g., 1433) set to forward external traffic to the database.
    5. If you wish to only use Dremio with a specific dataset, provide its explicit name for Database (e.g., master).
    6. To require authenticated access to the data source, select the Master Credentials radio button and then provide the Username and Password with sufficient access to the data source.
    7. (Optional) If an encrypted connection is required, select Encrypted connection.
    8. (Optional) If a server certificate is required, navigate to the Advanced Options tab, select Verify Server Certificate, and enter *.sql.azuresynapse.net for the SSL/TLS server certificate distinguished name.
    9. Click Save to complete the source setup.

    Predicate Pushdowns

    Dremio offloads these operations to Azure Synapse Analytics.
    %, *, +, -, /
    <, <=, <>, =, >, >=, !=
    AND, NOT, OR, ||
    ABS
    ACOS
    ADD_MONTHS
    ASIN
    ATAN
    ATAN2
    AVG
    CAST
    CEIL
    CEILING
    CHAR_LENGTH
    CHARACTER_LENGTH
    CONCAT
    COS
    COT
    DATE_ADD
    DATE_SUB
    DATE_TRUNC_DAY
    DATE_TRUNC_HOUR
    DATE_TRUNC_MINUTE
    DATE_TRUNC_MONTH
    DATE_TRUNC_YEAR
    DEGREES
    E
    EXP
    EXTRACT_DAY
    EXTRACT_DOW
    EXTRACT_DOY
    EXTRACT_HOUR
    EXTRACT_MINUTE
    EXTRACT_MONTH
    EXTRACT_QUARTER
    EXTRACT_SECOND
    EXTRACT_WEEK
    EXTRACT_YEAR
    FLOOR
    IS DISTINCT FROM
    IS NOT DISTINCT FROM
    IS NOT NULL
    IS NULL
    LAST_DAY
    LCASE
    LEFT
    LENGTH
    LIKE
    LN
    LOCATE
    LOG
    LOG10
    LOWER
    LPAD
    LTRIM
    MAX
    MIN
    MOD
    MONTH
    PI
    POSITION
    POW
    POWER
    RADIANS
    RAND
    REPLACE
    REVERSE
    RIGHT
    ROUND
    RPAD
    RTRIM
    SIGN
    SIN
    SQRT
    SUBSTR
    SUBSTRING
    SUM
    TAN
    TIMESTAMPADD_DAY
    TIMESTAMPADD_HOUR
    TIMESTAMPADD_MINUTE
    TIMESTAMPADD_MONTH
    TIMESTAMPADD_QUARTER
    TIMESTAMPADD_SECOND
    TIMESTAMPADD_YEAR
    TIMESTAMPDIFF_DAY
    TIMESTAMPDIFF_HOUR
    TIMESTAMPDIFF_MINUTE
    TIMESTAMPDIFF_MONTH
    TIMESTAMPDIFF_QUARTER
    TIMESTAMPDIFF_SECOND
    TIMESTAMPDIFF_WEEK
    TIMESTAMPDIFF_YEAR
    TO_DATE
    TRIM
    TRUNC
    TRUNCATE
    UCASE
    UPPER
    YEAR