What is pglogical?

What is pglogical?

pglogical is a logical replication system implemented entirely as a PostgreSQL extension. Fully integrated, it requires no triggers or external programs. This alternative to physical replication is a highly efficient method of replicating data using a publish/subscribe model for selective replication.

How does pglogical work?

pglogical can synchronize sequences. It does this by creating a buffer on the subscriber based on how quickly the sequence is being consumed. e.g. on the provider, the sequence can be at 1 and on the subscriber 1000 to create that buffer.

What is Postgres BDR?

Bi-Directional Replication (BDR) is an asynchronous multi-master replication system for PostgreSQL, specifically designed to allow geographically distributed clusters. Supporting up to 48 nodes (and possibly more in future releases) BDR is a low overhead, low maintenance technology for distributed databases.

What is wal2json?

wal2json is an output plugin for logical decoding. It means that the plugin have access to tuples produced by INSERT and UPDATE. All of the new/old tuples are available in the JSON object. Also, there are options to include properties such as transaction timestamp, schema-qualified, data types, and transaction ids.

How do you replicate RDS?

Resolution

1. Confirm that automated backups are enabled on the DB instance that you want to replicate.
2. Create a read replica of the DB instance using the same configuration.
3. Log in to the RDS-standby DB instance, and confirm that the replica is caught up with RDS-active:
4. Stop replication on RDS-standby:

Is Postgres BDR free?

The BDR 2. x series (for PostgreSQL 9.6) is not open source and is only available for 2ndQuadrant customers. However, parts of it have been submitted to PostgreSQL itself. It has been superseded by BDR 3.

What is the use of pglogical in PostgreSQL?

Taking advantage of logical replication, pglogical allows to filter rows and/or columns that need to be replicated to the standby database. Being selective during replication allows for reduced traffic, as well as data segregation as needed. pglogical is available for PostgreSQL 9.4 – 13.

What kind of Technology is pglogical based on?

It is based on technology developed as part of the BDR Project. We use the following terms to describe data streams between nodes, deliberately reused from the earlier Slony technology: pglogical is new technology utilising the latest in-core features, so we have these version restrictions:

Do you have to install pglogical on all servers?

Note that you must install pglogical on all servers that will act as publishers or subscribers. So if you’re replicating from 9.4 to 9.5 you’d install postgresql94-pglogical on the 9.4 server and postgresql95-pglogical on the 9.5 server.

How is pglogical used in a partitioned table?

Through seamless integration of partitioned tables, pglogical allows you to specify the root table and replicates all partitions. Different partitioning configurations can be defined on the subscriber, including replication of a non-partitioned table to a partitioned one, and vice versa.