Yuqi Intelligent Enterprise IT infrastructure and systems integration
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Database high availability

Database High Availability

Design a switchable, verifiable and maintainable database availability path around nodes, replication, failure boundaries, business connections, backup, recovery and operations monitoring.

Discuss database resilienceAvailability model

01 / Nodes and boundaries

Connections and database roles

Database high availability is not simply adding another server. Define application entry points, how data synchronizes, which components share a failure domain and what the business sees during node, network or storage faults.

Business entryConfirm connection strings, proxies, load balancing, DNS and post-failover access paths.
SynchronizationDefine synchronization mode, lag, replication state and protection actions during exceptions.
Failure boundarySeparate node, host, rack, network, storage and room-level failures.
Database high-availability architecture and implementation flow; diagram labels are in Chinese
The original diagram shows the primary, replica, replication and independent-backup relationship. Diagram labels remain in Chinese; platform capabilities and failover conditions depend on the confirmed project scope.

The architecture should answer who connects, who carries the workload, who synchronizes and who takes over instead of listing database software and hardware.

02 / Replication and protection

Availability and backup

Availability keeps service access continuous; it is not the same as historical data protection. Real-time replication, independent backup, offline or remote copies, recovery targets and checks belong in one protection boundary.

When deletion, logical corruption or a bad change occurs, switching to another node may carry the problem with it; an independent recovery path must be prepared.

What the pair can and cannot do

Availability pairProtects service access during a qualified node or path event.
Independent backupKeeps a separate route for deletion, corruption and historical recovery.
Failover depends on the database platform, replication state and fault-decision conditions.
Availability replicationTrack synchronization, lag, quorum, failure detection and failover conditions.
Independent backupKeep a backup repository, retention and recovery access independent from production nodes.
Capacity and recoveryAssess data growth, logs, backup windows, recovery space and validation time together.

03 / Failover

Verify business after failover

Failover validation starts with connections, transactions, replication, application reconnects and data consistency. It is not enough for a node to show “online”; business requests must reach the new active node as intended.

01
Detection and decision

Define the trigger signals and how to avoid false decisions and split brain.

02
Application reconnect

Verify connection entry points, pools, transactions, caches and interfaces continue working.

03
Business acceptance

Have the business check critical queries, writes, reports and upstream/downstream interfaces.

During a maintenance window, simulate node, link or storage faults and record detection, switch time, business impact, alerts and rollback conditions.

04 / Operations and handover

Operations and handover

After go-live, monitor replication lag, node health, log growth, backup completion, capacity headroom and alert handling. Handover records should tell operators what to watch, when to act and who escalates.

Put routine checks, exercises, configuration backup, version changes and recovery retests into one maintenance plan so availability does not degrade over time.

  • State and capacityTrack nodes, replication, logs, storage and growth trends.
  • Alerts and ownershipAssign owners and response times for lag, failures, low space and connection anomalies.
  • Records and retestsKeep topology, configuration, failover records, exercise results and the next retest plan.
Server storage hardware
Check nodes, storage and connections, and include the configuration in the handover record.

Related data-protection services

Next step

Review the failure boundary with a technical consultant

Bring the current topology, connection path, replication notes, backup policy and maintenance window.

Discuss database resilience