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Copy file name to clipboardExpand all lines: articles/postgresql/flexible-server/concepts-business-continuity.md
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- Earthquake causes a power outage and temporary disables a data center or an availability zone.
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- Database patching required to fix a bug or security issue.
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Flexible server provides features that protect data and mitigates downtime for your mission critical databases in the event of planned and unplanned downtime events. Built on top of the Azure infrastructure that already offers robust resiliency and availability, flexible server has business continuity features that provide additional fault-protection, address recovery time requirements, and reduce data loss exposure. As you architect your applications, you should consider the downtime tolerance - which is the recovery time objective (RTO) and data loss exposure - which is the recovery point objective (RPO). For example, your business-critical database requires stricter uptime requirements compared to a test database.
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Flexible server provides features that protect data and mitigates downtime for your mission critical databases in the event of planned and unplanned downtime events. Built on top of the Azure infrastructure that already offers robust resiliency and availability, flexible server has business continuity features that provide another fault-protection, address recovery time requirements, and reduce data loss exposure. As you architect your applications, you should consider the downtime tolerance - which is the recovery time objective (RTO) and data loss exposure - which is the recovery point objective (RPO). For example, your business-critical database requires stricter uptime requirements compared to a test database.
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The table below illustrates the features that Flexible server offers.
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|**Scenario**|**Process**|
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| ------------------- | ----------- |
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| <b>Compute scaling (User-initiated)| During compute scaling operation, active checkpoints are allowed to complete, client connections are drained, any uncommitted transactions are canceled, storage is detached, and then it is shut down. A new flexible server with the same database server name is provisioned with the scaled compute configuration. The storage is then attached to the new server and the database is started which performs recovery if necessary before accepting client connections. |
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| <b>Scaling up storage (User-initiated) | When a scaling up storage operation is initiated, active checkpoints are allowed to complete, client connections are drained, any uncommitted transactions are canceled, and then it is shut down. The storage is scaled to the desired size and then attached to the new server. A recovery is performed if needed before accepting client connections. Note that scaling down of the storage size is not supported. |
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| <b>Scaling up storage (User-initiated) | When a scaling up storage operation is initiated, active checkpoints are allowed to complete, client connections are drained, and any uncommitted transactions are canceled. After that the server is shut down. The storage is scaled to the desired size and then attached to the new server. A recovery is performed if needed before accepting client connections. Note that scaling down of the storage size is not supported. |
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| <b>New software deployment (Azure-initiated) | New features rollout or bug fixes automatically happen as part of service’s planned maintenance, and you can schedule when those activities to happen. For more information, check your [portal](https://aka.ms/servicehealthpm). |
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| <b>Minor version upgrades (Azure-initiated) | Azure Database for PostgreSQL automatically patches database servers to the minor version determined by Azure. It happens as part of service's planned maintenance. The database server is automatically restarted with the new minor version. For more information, see [documentation](../concepts-monitoring.md#planned-maintenance-notification). You can also check your [portal](https://aka.ms/servicehealthpm).|
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