<p><strong><span style="font-size:18px">What Is the Number of Connections of DDS?</span></strong></p> <p>The number of connections refers to the number of applications that can be simultaneously connected to the database. Generally, it refers to the number of connections between the client and the database. The number of connections is irrelevant to the maximum number of users allowed by your applications or websites.</p> <p><strong><span style="font-size:18px">How to Get Access to DDS?</span></strong></p> <p>For security purposes, Ping An Cloud does not support direct connection to DDS instance from public Internet. DDS instance shall be connected from Ping An Cloud ECS. For more information, see Quick Start.</p> <p><strong><span style="font-size:18px">Do Applications Need to Support Automatic Reconnecting to the DDS Database?</span></strong></p> <p>It is recommended that your applications support automatic reconnection to the database. After a database reboot, your applications will be automatically recovered without manual intervention.</p> <p><strong><span style="font-size:18px">Whether DDS Supports Backup and Restoration? How Long Does DDS Retain Restored Data?</span></strong></p> <p>Support Backup and Restoration.</p> <p>1. The data is restored in the new temporary recovery instance in Ping An Cloud DDS.</p> <p>&bull; The region where the new temporary recovery instance is located is the same as that of the general instance. Extra fees will not be charged.</p> <p>&bull; A maximum of seven days of new DDS instance can be kept. After seven days, Ping An Cloud will release temporary recovery instances.</p> <p>2. The computing specification of new temporary recovery instance is the smallest. The storage specification is the same as that of the general instance in performing the restoration.</p> <p>3. After a temporary recovery instance is created successfully, computing specification and storage specification will not be changed.</p> <p>4. Each general instance creates a maximum of three temporary recovery instances every day. If you need to restore the fourth temporary recovery instance, release temporary recovery instance you created before.</p> <p>5. Temporary recovery instances will create a user. The username is temp_root and has readwrite permissions.</p> <p><strong><span style="font-size:18px">How Many Methods Are There to Back Up and Restore? Are There Any Differences?</span></strong></p> <p>Two methods: Backup sets or Point in Time</p> <p>&bull; <strong>Backup Sets:</strong> You can restore database information at backup time.</p> <p>&bull; <strong>Point in Time:</strong> You can restore the database information from the first backup to any point in time between the first two hours of the current time.</p> <p>For example, you created a general instance at 00:00 on May 1, 2019 and current time is 12:00 on May 5, 2019. During this period, there are two manual backups. The backup time is 14:00 on May 2, 2019 and 20:00 on May 3, 2019 respectively. If you restore data according to the following method:</p> <p>&bull; Restoration of <strong>Backup Sets: </strong>You can restore database according to the time you restored. For example, you can restore database information at 14:00 on May 2, 2019 or 20:00 on May 3, 2019.</p> <p>&bull; Restoration of <strong>Point in Time:</strong> You can restore database information of any time from 14:00 on May 2, 2019 to 10:00 on May 5, 2019.</p> <p>&nbsp;</p>