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    Oracle

    Oracle is an object-relational database management system that is widely used in enterprise applications, and this topic describes how to configure an Oracle database as a Dremio Sonar source.

    Prerequisites

    Ensure that you have the following details before configuring Oracle as a source:

    • Hostname or IP address
    • Port
    • Service Name

    Dremio Oracle Configuration

    Perform these steps to configure Oracle:

    1. In the Datasets UI, you can see a truncated list of Sources at the bottom-left of the page. Click + Add Source.

      This is a screenshot showing how to add a source.

      Alternatively, click Databases. The page displays all database sources. Click the Add database button at the top-right of that page.

    2. In the Add Data Source dialog, click Oracle.

      The following section describes the source configuration tabs.

    General

    The General tab contains the required fields to create an Oracle source.

    This is a screenshot showing the General tab.

    Perform these steps in the General tab:

    1. In the General tab, for Name, enter a name.
    2. For Host, enter the Oracle host name.
    3. For Port, enter the Oracle port number. The default port is 1521.
    4. For Service Name, enter the service name of your Oracle database.
    5. (Optional) For Enable TLS encryption, enable encrypted connections to Oracle using TLS.

    note:

    You can only enable TLS encryption or Oracle native encryption for a given source.

    1. (Optional) For Oracle Native Encryption, the default encryption is Accepted. The other values are Required, Rejected, and Requested.

      To enable Oracle native encryption, you should also modify the SQLNET.Ora file by adding the following lines.

      SQLNET.ENCRYPTION_SERVER = required. //Set the value to required or request
      SQLNET.ENCRYPTION_TYPES_SERVER = (AES256) //Set the value to the appropriate encryption and the value can be different.
      SQLNET.CRYPTO_CHECKSUM_SERVER = required
      

      The Oracle native encryption values are described in the following table.

      Oracle Native Encryption ValuesDescription
      AcceptedThe client or server allows both encrypted and non-encrypted connections. This is the default if the parameter is not set.
      RejectedThe client or server refuses encrypted traffic.
      RequestedThe client or server requests encrypted traffic if it is possible, but accepts non-encrypted traffic if encryption is not possible.
      RequiredThe client or server only accepts encrypted traffic.
    2. For Authentication, you must choose one of the following authentication options:

    • Master Authentication, this is the default option. Provide the username and password of a master database user with permissions to read required objects:
      • For Username, enter your Oracle database username.
      • For Password, enter your Oracle database password.
    • For Secret Resource Url, provide the username and the Secret Resource URL that allows fetching the credentials, username and password, and the connection details from the AWS Secrets Manager:
      • For Username, enter your Oracle database username.
      • For Secret Resource Url, enter the secret resource URL.
    • For Kerebros, choose this option when the source database has Kerebros configured.

    Advanced Options

    Click Advanced Options in the sidebar.

    This is a screenshot showing the Advanced Options tab.

    note:

    All advanced options are optional.

    Advanced OptionDescription
    Use timezone as connection regionIf selected, uses timezone to set connection region.
    Include synonymsIf selected, includes synonyms as datasets.
    Map Oracle DATE columns to TIMESTAMPIf checked, Oracle DATE columns are exposed as TIMESTAMP.
    Record fetch sizeNumber of records to fetch at once. Set to 0 (zero) to have Sonar automatically decide. The default record fetch size is 200.
    Maximum Idle ConnectionsThe total number of connections allowed to be idle at a given time. The default maximum idle connections is 8.
    Connection Idle TimeThe 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.
    Use LDAP Naming ServicesTo use LDAP in the authentication of the external sources that can be used rather than locally configured users within Oracle. If checked, enter a domain name in the Set DN for LDAP Naming Services text box.
    EncryptionProvide the SSL/TLS server certificate distinguished name, otherwise, leave it blank to disable the DN match.
    Connection PropertiesCustom key value pairs for the connection relevant to the source. To add a connection property, click Add property and add the property name and value.

    Reflection Refresh

    The Reflection Refresh tab in the sidebar allows you to set time intervals for reflections to refresh or expire.

    This is a screenshot showing the Reflection Refresh tab.

    Metadata

    You can configure settings to refresh metadata and handle datasets. Click Metadata in the sidebar.

    This is a screenshot showing the Metadata tab.

    You can configure Dataset Handling and Metadata Refresh parameters.

    Dataset Handling

    These are the Dataset Handling parameters.

    note:

    All Dataset Handling parameters are optional.

    ParameterDescription
    Remove dataset definitions if underlying data is unavailableBy default, Sonar 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 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.

      ParameterDescription
      (Optional) Fetch everyYou 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 Sonar needs for query planning such as information required for fields, types, shards, statistics, and locality. These are the parameters to fetch the dataset information.

    note:

    All Dataset Details parameters are optional.

    ParameterDescription
    Fetch modeYou can choose to fetch only from queried datasets that are set by default. Sonar updates details for previously queried objects in a source. Fetching from all datasets is deprecated.
    Fetch everyYou 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 afterYou 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

    You can grant privileges to specific users or roles.

    This is a screenshot showing the Privileges tab.

    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 to the Oracle source that is being created.

    Click Save after setting the configuration.

    Editing an Oracle Source

    To edit an Oracle source:

    1. In the Datasets UI, click Databases. A list of databases is displayed.
    2. Under the Actions column, click the Settings (gear) icon for the source you want to edit. From the list of actions, click Edit Details.

    This is a screenshot showing how to edit details.

    1. In the Edit Source dialog, you cannot edit the name. Editing other parameters is optional.
    2. Click Save.

    Removing an Oracle Source

    To remove an Oracle source, perform these steps:

    1. In the Datasets UI, click Databases. A list of sources is displayed.
    2. Under the Actions column, click the Settings (gear) icon for the source that you want to remove.

    This is a screenshot showing how to remove a source.

    1. From the list of actions, click Remove Source. Confirm that you want to remove the source.

    warning:

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

    Predicate Pushdowns

    Dremio offloads these operations to Oracle.

    OperatorsOperatorsOperatorsOperators
    *, +, -, /, %DATE_TRUNC_MINUTELCASERPAD
    <, <=, <>, =, >, >=, !=DATE_TRUNC_MONTHLEFTRTRIM
    AND, NOT, OR, ||DATE_TRUNC_QUARTERLENGTHSIGN
    ABSDATE_TRUNC_WEEKLIKESIN
    ACOSDATE_TRUNC_YEARLNSINH
    ASINDEGREESLOCATESQRT
    ATANELOGSTDDEV
    ATAN2EXPLOG10STDDEV_POP
    AVGEXTRACT_CENTURYLOWERSTDDEV_SAMP
    CASTEXTRACT_DAYLPADSUBSTR
    CEILEXTRACT_DOWLTRIMSUBSTRING
    CEILINGEXTRACT_DOYMAXSUM
    CHAR_LENGTHEXTRACT_HOURMINTAN
    CHARACTER_LENGTHEXTRACT_MINUTEMODTANH
    CONCATEXTRACT_MONTHPITO_CHAR
    COSEXTRACT_QUARTERPOSITIONTO_DATE
    COSHEXTRACT_SECONDPOWTRIM
    COTEXTRACT_WEEKPOWERTRUNC
    COVAR_POPEXTRACT_YEARRADIANSTRUNCATE
    COVAR_SAMPFLOORREGEXP_LIKEUCASE
    DATE_ADDIS DISTINCT FROMREPLACEUPPER
    DATE_SUBIS NOT DISTINCT FROMREVERSEVAR_POP
    DATE_TRUNC_DAYIS NOT NULLRIGHTVAR_SAMP
    DATE_TRUNC_HOURIS NULLROUND