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DDS UMN Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: proposalbot <proposalbot@otc-service.com> Co-committed-by: proposalbot <proposalbot@otc-service.com>
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5.2 KiB
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37 lines
5.2 KiB
ReStructuredText
:original_name: dds_02_0002.html
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.. _dds_02_0002:
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Restrictions
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============
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To improve the stability and security of DB instances, there are some restrictions on the use of DDS. For details, see :ref:`Table 1 <dds_02_0002__table60364850123535>`.
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.. _dds_02_0002__table60364850123535:
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.. table:: **Table 1** Function restrictions
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Operation | Restrictions |
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+==============================================+======================================================================================================================================================================+
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| Connecting to a DB instance through a client | - To access a DDS DB instance which is not publicly accessible from an ECS, the instance must be in the same VPC subnet as the ECS. |
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| | - By default, DDS cannot be accessed through an ECS in a different security group. You need to add an inbound rule to the DDS security group. |
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| | - The default DDS port number is 8635. You can change it if you want to access DDS through another port. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Deployment | ECSs in which DB instances are deployed are not visible to you. Your applications can access the database only through an IP address and port. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Obtaining permissions of user **rwuser** | Only the **rwuser** user permissions are provided on the instance creation page. |
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| | |
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| | For details about the related commands, see :ref:`Which Commands are Supported or Restricted by DDS? <dds_faq_0033>` |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Setting database parameters | Most database parameters in the parameter groups you created can be modified. For details, see section :ref:`Editing a Parameter Group <en-us_topic_configuration>`. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Migrating data | You can use command line tools, including mongoexport and mongoimport, to migrate data. For details, see section :ref:`Migrating Data <dds_03_0052>`. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Storage engine | The WiredTiger storage engine is supported. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Restarting a DB instance or a node | A DDS DB instance must be restarted on the DDS console. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| Viewing DDS backup files | You can download and view the backup files on the DDS console. For details, see section :ref:`Downloading Backup Files <en-us_topic_backup_download>`. |
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+----------------------------------------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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