dr

Author: brown9804

0_Azure/1_AzureData/1_Databases/demos/9_MySQL_BU_DR.md

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 | **Geo-Redundant Storage (GRS)** | - Multiple copies of backups are stored within the region and replicated to its geo-paired region.<br/>- Provides at least `99.99999999999999%` (16 9's) durability of backup objects over a given year.<br/>- Enabled at server create time for geo-redundant backup storage.<br/>- Can be moved from LRS to GRS post-creation.<br/>- Supported for servers in any Azure paired regions. | - Data replication across geo-paired regions.<br/>- Highest durability and availability.<br/>- Protection against regional disasters.<br/>- Ability to restore in a different region. | - For applications requiring the highest level of durability and availability.<br/>- When protection against regional disasters is critical.<br/>- When the ability to restore in a different region is needed. |
 | **Zone-Redundant Storage (ZRS)** | - Multiple copies of backups are stored within the availability zone and replicated to another availability zone in the same region.<br/>- Provides at least `99.9999999999%` (12 9's) durability of backup objects over a given year.<br/>- Selected at server create time for zone-redundant HA.<br/>- Backup storage remains zone-redundant even if HA is disabled post-creation. | - Data replication across multiple availability zones.<br/>- Higher availability and resilience against zone-level failures.<br/>- Meets data residency requirements within a country/region. | - For mission-critical applications requiring high availability.<br/>- When protection against zone-level failures is needed.<br/>- When data residency requirements must be met. |
 
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 ## Disaster Recovery (DR) for MySQL on Azure
 
+| **Category**| **Description**| **Technical Details**|
+|-----------------------|----------|--------------|
+| **Geo-Replication**   | - **Read Replicas**: Azure Database for MySQL supports read replicas, which can be created in the same or different regions. These replicas can be promoted to standalone servers in case of a primary server failure.<br/>- **Cross-Region Replication**: This feature allows you to replicate your MySQL instance to a different Azure region, providing a robust DR solution. | - **Replication Method**: Uses MySQL's native binary log (binlog) file position-based replication.<br/>- **Creation**: Up to 10 replicas can be created.<br/>- **Promotion**: Replicas can be promoted to standalone servers.<br/>- **Cross-Region Replication Setup**: Requires primary and secondary servers in different regions. |
+| **Failover Strategies** | - **Automatic Failover**: In the event of a failure, Azure Database for MySQL can automatically failover to a read replica or a secondary instance, minimizing downtime.<br/>- **Manual Failover**: You can manually initiate a failover to a read replica or a secondary instance if needed. | - **Automatic Failover Configuration**: Enabled during server creation.<br/>- **Process**: Standby replica is activated to become the primary server.<br/>- **Manual Failover Steps**: Initiate failover via Azure Portal.<br/>- **DNS Update**: DNS record is updated to point to the new primary server. |
+| **High Availability (HA)** | - **Zone-Redundant HA**: Azure offers zone-redundant high availability, which ensures that your MySQL instance is replicated across multiple availability zones within a region. This setup provides resilience against zone-level failures.<br/>- **Regional HA**: For even greater resilience, you can configure your MySQL instance to be replicated across different regions. | - **Zone-Redundant HA Architecture**: Primary server in one availability zone, standby replica in another.`Uses zone-redundant storage (ZRS)`.<br/>- **Regional HA Architecture**: Primary server in one region, standby replica in another region. `Uses geo-redundant storage (GRS).` |
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