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How do you do logical replication in PostgreSQL?
To perform logical replication in PostgreSQL, you’ve to change the wal_level = logical parameter. The parameter tells the server to store additional information in WAL for converting binary changes into logical ones. To change the value of this parameter, you have to open the postgresql. conf file.
How does logical replication work?
Logical replication uses a publish and subscribe model with one or more subscribers subscribing to one or more publications on a publisher node. The subscriber applies the data in the same order as the publisher so that transactional consistency is guaranteed for publications within a single subscription.
What are the types of replication?
Types of data replication
- Full table replication.
- Transactional replication.
- Snapshot replication.
- Merge replication.
- Key-based incremental replication.
How does subscription server work in PostgreSQL streaming replication?
Subscription server is also known as the stand by server which we have defined in streaming replication. To create subscription in PostgreSQL we need to have super user privileges to create it. Below example shows that we need to have super user privileges to create subscription.
How does logical replication work in PostgreSQL schema?
Publication is defined as publisher node. We are adding specified table into publication which was replicated on slave server. Publication is also defined as changed from master server will be reflected on slave server. PostgreSQL logical replication will be different from the other object which was used in PostgreSQL like schema or database.
How does the logical streaming replication protocol work?
This section describes the logical replication protocol, which is the message flow started by the START_REPLICATION SLOT slot_name LOGICAL replication command. The logical streaming replication protocol builds on the primitives of the physical streaming replication protocol. 52.5.1. Logical Streaming Replication Parameters
How are two standbys used in replication in Postgres?
The two standbys are streaming the data from the master using two different physical replication slots: standby_east and standby_west. To make the standby use physical replication slots, it is necessary to create the physical replication slots on master before standbys connect to the master.