<p><span style="font-size:18px"><strong>Does RDS Service Support Remote Disaster Recovery Instance?</strong></span></p> <p>It supports remote disaster recovery instance. Ping An Cloud RDS service supports deploying instances including general instances, citywide and remote disaster recovery instances, and citywide and remote read-only instances in three centers in two places. For more information, see <a href="http://pinganyun.com/ssr/help/database/RDS/Product_Introduction.Architecture" target="_blank">Architecture</a>.</p> <p><span style="font-size:18px"><strong>How Many Types of Instance Specifications Does RDS Service Provide to Users for Custom Usage?</strong></span></p> <p>For more information, see Instance Type: <a href="http://pinganyun.com/ssr/help/database/RDS/Product_Introduction.Instance_Type.RDS_MySQL" target="_blank">RDS-MySQL</a> and <a href="http://pinganyun.com/ssr/help/database/RDS/Product_Introduction.Instance_Type.RDS_PostgreSQL" target="_blank">RDS-PostgreSQL</a>.</p> <p><span style="font-size:18px"><strong>Does RDS Service Support Upgrading or Degrading Capacity?</strong></span></p> <p>RDS service supports upgrading and degrading capacity. For more information, see Capacity Management: <a href="http://pinganyun.com/ssr/help/database/RDS/User_Guide_RDS_MySQL.Capacity.Upgrade.Upgrade_Common_Spec" target="_blank">RDS-MySQL</a> and <a href="http://pinganyun.com/ssr/help/database/RDS/User_Guide_RDS_PostgreSQL.Capacity.Upgrade.Upgrade_Common_Spec" target="_blank">RDS-PostgreSQL</a>.</p> <p><span style="font-size:18px"><strong>How Many Read-Only Instances Can Be Created by RDS Service?</strong></span></p> <ol> <li>Multiple citywide read-only instances can be created. We recommend that you create no more than five read-only instances.</li> <li>Only one read-only instance can be created in each region.</li> </ol> <p><span style="font-size:18px"><strong>Does RDS Service Support Backup Restoring? How Long Can the Restored Data Be Stored?</strong></span></p> <p>RDS service supports restoring backup.</p> <p>1.&nbsp; The restored data is stored in a temporary recovery instance newly created by RDS service of Ping An Cloud:</p> <p>&nbsp; &nbsp; &bull;&nbsp; The region of the newly created temporary recovery instance is the same as that of a general instance. The temporary recovery instance will not be charged additionally.</p> <p>&nbsp; &nbsp; &bull;&nbsp; The newly created instance can be stored for a maximum of seven days and will be released after seven days.</p> <p>2.&nbsp; The newly created temporary recovery instance adopts the minimum computing specifications. The storage specifications are the same as those of the general instance on which the restoring operation is performed.</p> <p>3.&nbsp; After the temporary recovery instance is successfully created, the computing and storage specification will not change.</p> <p>4.&nbsp; Each general instance can create a maximum of three temporary recovery instances. If you need to create the fourth one, release the previously created temporary recovery instances first.</p> <p>5.&nbsp; The temporary recovery instance will automatically create an account. Its username is temp_root and it has the read/write permission of the instance.</p> <p><span style="font-size:18px"><strong>How Many Methods Does RDS Service Provide for Restoring Backup? What&rsquo;s the Difference Between These Methods?</strong></span></p> <p>Currently, RDS service supports two methods to restore backup including restoring backup data by backup set and by time.</p> <p>&bull;&nbsp;&nbsp;<strong>By backup set</strong>: It can restore the database information of the backup time.</p> <p>&bull;&nbsp;&nbsp;<strong>By time</strong>: It can restore the database information of any time from the first backup time to two hours earlier than current time.</p> <p>For example: You created a general instance at 00:00 of May 1, 2019. The current time is 12:00 of May 5, 2019. During this period, two manual backups were performed at 14:00 of May 2, 2019 and 20:00 of May 3, 2019 respectively. If you restore data with the following two methods:</p> <p>&bull;&nbsp; Restore data <strong>by backup set</strong>: You can restore database by backup time. For example, you can restore database information of 14:00 of May 2, 2019 or 20:00 of May 3, 2019.</p> <p>&bull;&nbsp; Restore data <strong>by time</strong>: You can restore database information of any time from 14:00 of May 2, 2019 to 10:00 of May 5, 2019.</p> <p><img src="https://obs-cn-shanghai.yun.pingan.com/pcp-portal/20200707114012-19dc618895b2.png" style="height:287px; width:830px" /></p> <p><span style="font-size:18px"><strong>Does RDS Service Need to Download a Certificate After the SSL Encryption is Enabled?</strong></span></p> <p>RDS-MySQL service needs to download a certificate. For more information, see <a href="http://pinganyun.com/ssr/help/database/RDS/User_Guide_RDS_MySQL.Security_Management.SSL" target="_blank">Enable SSL Encryption</a>.</p> <p>RDS-PostgreSQL service does not need to download a certificate. For more information, see <a href="http://pinganyun.com/ssr/help/database/RDS/User_Guide_RDS_PostgreSQL.Security_Management.SSL" target="_blank">Enable SSL Encryption</a>.</p>