What Precautions Should Be Taken When Using DDS?
- Failover
DDS uses multiple mongos, replica sets, and shards to ensure data reliability. When a mongos is faulty, the other mongos takes over services immediately to ensure service continuity. A replica set consists of a primary, a secondary, and a hidden node. When the primary node is faulty, DDS selects the secondary node as the new primary within 30 seconds.
- ECSs used for DB instances are invisible to you. Your applications can access only the IP addresses and ports corresponding to the database.
- Backup files stored on OBS are invisible to you. They are only visible in the DDS backend management system.
- Precautions after applying for DDS:
After purchasing DDS DB instances, you do not need to perform basic database O&M operations, such as HA and security patches. You need to pay attention to the following:
- Whether the vCPUs, IOPS, and storage space for DDS DB instances are sufficient. If any of them is insufficient, optimize or upgrade the related configuration.
- Whether the performance of DDS DB instances is satisfying, whether a large number of slow query statements exist, whether query statements need to be optimized, and whether any index is redundant or missing.
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