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Showing content from https://thenewstack.io/distributed-postgres-high-availability-for-mission-critical-apps/ below:

Distributed Postgres: High Availability for Mission-Critical Apps

The database systems that power mission-critical applications must deliver unwavering reliability, exceptional performance and global accessibility. When downtime translates directly to lost revenue, damaged reputation or disrupted essential services, traditional high-availability approaches often fall short. Distributed PostgreSQL has emerged as a powerful alternative to conventional methods, providing continuous operations across global networks.

Conventional PostgreSQL high availability typically relies on master-replica configurations with automated failover. While effective for handling isolated server failures, these approaches have inherent limitations when facing larger challenges:

• Regional vulnerability: If an entire cloud region experiences an outage, both primary and replicas may become unavailable simultaneously.
• Failover delays: Even automated failover processes introduce recovery time, interrupting service availability.
• Global latency: Users geographically distant from the database experience significantly slower response times.
• Maintenance windows: System updates and schema changes often require scheduled downtime.

For applications where every minute of downtime has significant consequences, these limitations represent unacceptable risks.

Distributed PostgreSQL architectures address these challenges through fundamentally different design principles. Rather than handling failover and load balancing through complex, risky and resource-intensive operations, native multimaster replication offers a solution for high availability and disaster recovery that’s built into your database architecture.

In this approach, multimaster (also called active-active) clusters are designed with multiple database nodes — potentially spanning different geographic regions and/or cloud vendors — simultaneously processing both read and write operations. The results?

• No single point of failure: The system remains available even if some nodes fail. When any node goes down, traffic is dispersed between the healthy nodes in the active-active cluster without waiting for a replica to be promoted to master, as would be the case in a traditional active-passive setup. If one or more nodes drop, traffic immediately fails over to the remaining active nodes.
• Reduced latency: Users are able to connect to nearby nodes for faster responses. Placing the data and database close to the edge can result in dramatically improved loading times. This also helps provide a consistent experience for all users, no matter where they’re located.
• Low to zero recovery time objectives (RTO) and recovery point objectives (RPO): Organizations can meet critical high-availability requirements, such as four nines of availability and above. When leveraging an active-active database solution, maintenance operations such as upgrades can be accomplished with little to no downtime through such methods as rolling upgrades.
• Geographic resilience: Implementing a multiregion and/or multicloud approach provides protection against regional infrastructure failures. This approach also offers protection from vendor lock-in, along with cost and performance optimization.
• Simplified operations: When the solution is built into the architecture, as with a distributed PostgreSQL database, operations are streamlined. Less time is invested and less risk is involved versus a traditional cross-region and cross-cloud failover implementation that’s used to achieve the same end result.

This allows you to leverage the best of PostgreSQL while ensuring consistently available data for your applications, and dramatically improving performance and resiliency for globally distributed users.

A number of vendors offer solutions for deploying a distributed PostgreSQL architecture. When choosing the right implementation for your organization, there are some key considerations that make a difference.

Different applications have varying requirements for data consistency:

• Strong consistency: All nodes must show the same data at all times.
• Eventual consistency: Temporary differences between nodes are acceptable.

Choosing the right approach depends on your application requirements and business needs. Many distributed PostgreSQL implementations offer eventual consistency, which provides excellent availability and performance while ensuring that all nodes eventually reach the same state.

Solutions built on standard PostgreSQL typically provide the best long-term value, quickest time to adoption and lowest migration effort.

As a result, when evaluating solutions, organizations should assess:

• Extension support: Is it compatible with the needed PostgreSQL extensions?
• Feature support: Does it have access to core PostgreSQL capabilities?
• Upgrade path: Can it adopt new PostgreSQL versions with minimal variance from the official PostgreSQL release schedule?

Resources like PG Scorecard can be used to evaluate if a vendor’s claims of compatibility with standard PostgreSQL are true.

When working with applications that are available to a distributed user base, it is essential to consider a solution that can accommodate conflicts appropriately while maintaining data integrity.

Sometimes this is as simple as ensuring that appropriate action is taken to address conflict resolution when an update is performed on the same row at the same time. This can look like an approach where the last update wins and conflicts are recorded for future monitoring and analysis.

Another example is when working with incremental running sums. Solutions such as the pgEdge Spock extension’s conflict-free delta-apply columns can prevent conflicts by altering columns with the delta of the update and shipping the delta to other databases, guaranteeing a correct result in the end.

Regulations can require you to restrict certain data within specific geographic boundaries to remain compliant and/or respect user privacy laws. In this case, you should choose a vendor that allows for data to be partitioned with geosharding. This approach manages partitions in a geographically sensitive manner and allows some partitions to be replicated between countries, whereas other partitions remain within the original country.

Banks and financial institutions can benefit from distributed PostgreSQL to prevent conflicts and guarantee always-on, real-time data operations. This is especially relevant when seeking to:

• Maintain 24/7 trading and banking platforms.
• Meet strict regulatory requirements for availability.
• Process transactions quickly regardless of customer location.

Healthcare providers can use distributed PostgreSQL for:

• Continuous access to patient records across facilities.
• Compliance with data privacy and residency requirements.
• Immediately accessing critical data (with accurate results) when providing patient care.

Online retailers can implement distributed PostgreSQL to:

• Maintain shopping applications and inventory systems with global availability.
• Optimize checkout performance for customers worldwide and provide a consistent user experience.
• Handle seasonal traffic surges without disruption or worry about data integrity.

Distributed PostgreSQL provides a resilient database solution for applications that demand ultra-high availability, low to zero downtime maintenance and low latency. You get all the advantages of PostgreSQL, from open source development, a versatile and extensible relational database management system (RDBMS) and 100% SQL standard-compliant administration (among many other benefits) while designing for scalability, flexibility and conflict-free operations.

As applications continue to serve globally distributed users with ever-increasing volumes of data, distributed PostgreSQL has become a valuable solution for data management within a mission-critical infrastructure. By eliminating traditional approaches for database availability (such as active-passive clusters), these architectures enable a new generation of resilient applications that are capable of avoiding interrupted operations with often dramatically improved performance.

For organizations where database downtime simply isn’t an option, distributed PostgreSQL represents not just an improved database architecture, but a strategic advantage in delivering consistently excellent service to users worldwide.

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