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document-database-service/umn/source/getting_started_with_replica_sets/restrictions.rst
proposalbot 2efa8ae881 Changes to dds_umn from docs/doc-exports#409 (DDS UMN 20221101 version 
DDS UMN

Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
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dds_02_0011.html

Restrictions

To improve the stability and security of DB instances, there are some restrictions on the use of DDS. For details, see Table 1 <dds_02_0011__en-us_topic_0105284934_table60364850123535>.

Table 1 Function restrictions
Operation Restrictions
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.
  • 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.
  • The default DDS port number is 8635. You can change it if you want to access DDS through another port.
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.
Obtaining permissions of user rwuser

Only the rwuser user permissions are provided on the instance creation page.

For details about the related commands, see Which Commands are Supported or Restricted by DDS? <dds_faq_0033>
Setting database parameters Most database parameters in the parameter groups you created can be modified. For details, see section Editing a Parameter Group <en-us_topic_configuration>.
Migrating data You can use command line tools, including mongoexport and mongoimport, to migrate data. For details, see section Migrating Data <dds_03_0052>.
Storage engine Currently, DDS supports the WiredTiger storage engine only.
Restarting a DB instance or a node A DDS DB instance must be restarted on the DDS console.
Viewing DDS backup files You can download and view the backup files on the DDS console. For details, see section Downloading Backup Files <en-us_topic_backup_download>.