PostgreSQL Replication Services
Protect your database with state-of-the-art PostgreSQL Replication.
Modern replication is almost a standard now—don’t be left behind in case of disaster, and ensure the security of your database investment. Implement an expert-level PostgreSQL replication solution that only XTIVIA can provide.
What is PostgreSQL Replication?
Replication is the duplication of data from one place to another. Data is transported by programs to another location, and then loaded. A more efficient alternative to basic replication is to extract only the changes since the last processing cycle and transport/apply those to the receiving location. In most cases, replication must not interfere with existing applications and have minimal impact on production systems. Thus, replication processes must be managed and monitored.
What We Provide
XTIVIA’s PostgreSQL DBAs start by connecting with your business to develop a PostgreSQL replication strategy. Whatever your organizational objectives, our staff comes equipped to confidently handle a full spectrum of replication server activities.
These functions are designed to help you implement and maintain a solution that works best for your company.
Our services include:
- Initial assessments and requirements review
- Replication system design
- Approach and plan definition
- Schedule and cost estimations
- Testing and validation
- Training to administer replication server
- Replication server monitoring using Virtual-DBA when requested
Assess your PostgreSQL replication
We provide value to your business with assessment and assistance for your PostgreSQL database and DBA team.
Types of Replication
Shared Disk Failover
This method allows for rapid failover without data loss, while still having only one copy of the database. This method avoids any synchronization overhead by sharing a common disk between all database servers. If the main server fails, the standby server accesses the shared disk as though it was recovering from a database crash. The main point of failure is the shared disk array; if it becomes corrupt or unavailable, primary and standby are non functional. Also, only the primary server should have access to the storage while it is active.
File System Replication
In this type of replication, hardware is shared, and all changes to the file system need to be mirrored on another server. The main challenge here is that primary file system mirroring is needed to guarantee the standby has a consistent copy of the file system. Writes to the file system need to be done in exactly the same order on the standby as they were on the primary.
Hot/Warm Standby Using “Point In Time Recovery” (PITR)
Logs from the primary server are applied to the warm standby server. The standby can be made the new primary and would contain all the changes from the logs transferred before the failure. This method is asynchronous and can only be performed against the complete primary server.
All queries that modify data are sent from the master asynchronously to the slave. In this setup, the slave is available for read only queries while the master is running.
Statement-Based Replication Middleware
Each server operates independently, while a middleware program captures each SQL query and forwards it to all or just one of the servers. Read-only queries can be sent to just a single server, allowing for a distributed workload. Read/write queries are sent to all servers. Extreme caution should be used to make sure all transactions commit or abort on all servers. Also any application or middleware should be written in a manner so as to not use unmodified functions or sequences that could potentially return different values depending on which server was used.
Asynchronous Multimaster Replication
Each server works on its own, communicating with the other servers to identify conflicting transactions. Rules are defined or users can resolve any conflicts. This works well in an environment where servers maintaining a constant connection is a challenge.
Managing Your Databases
While you manage your business.
US-based Since 1999
Providing Database Managed Services and more, with onshore and offshore options.
Dedicated Certified DBAs
24x7 support, with an average of 15+ years of experience
Flexible Contract Terms
Full-time 24x7 on-call to on-demand DBA Services