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Update concepts-business-continuity.md
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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 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 flexible server provides features that protect data and mitigates downtime for your mission-critical databases during planned and unplanned downtime events. Built on top of the Azure infrastructure that offers robust resiliency and availability, the 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 - the recovery time objective (RTO), and data loss exposure - the recovery point objective (RPO). For example, your business-critical database requires stricter uptime than a test database.
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The table below illustrates the features that Flexible server offers.
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Below are some unplanned failure scenarios and the recovery process.
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| **Scenario** | **Recovery process** <br> [Servers configured without zone-redundant HA] | **Recovery process** <br> [Servers configured with Zone-redundant HA] |
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| **Scenario** | **Recovery process** <br> [Servers configured without zone-redundant HA]| **Recovery process** <br> [Servers configured with Zone-redundant HA] |
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| ---------- |------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| ------- |
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| <B>Database server failure | If the database server is down, Azure will attempt to restart the database server. If that fails, the database server will be restarted on another physical node. <br /> <br /> The recovery time (RTO) is dependent on various factors including the activity at the time of fault such as large transaction and the volume of recovery to be performed during the database server startup process. <br /> <br /> Applications using the PostgreSQL databases need to be built in a way that they detect and retry dropped connections and failed transactions. | If the database server failure is detected, the server is failed over to the standby server, thus reducing downtime. For more information, see [HA concepts page](./concepts-high-availability.md). RTO is expected to be 60-120s, with zero data loss. |
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| <B>Storage failure | Applications do not see any impact for any storage-related issues such as a disk failure or a physical block corruption. As the data is stored in three copies, the copy of the data is served by the surviving storage. The corrupted data block is automatically repaired and a new copy of the data is automatically created. | For any rare and non-recoverable errors such as the entire storage is inaccessible, the flexible server is failed over to the standby replica to reduce the downtime. For more information, see [HA concepts page](./concepts-high-availability.md). |

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