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When to use logical replication and partitioning in Postgres?
With the benefits of both logical replication and partitioning, it is a practical use case to have a scenario where a partitioned table needs to be replicated across two PostgreSQL instances. Following are the steps to establish and highlight the improvement being done in PostgreSQL 13 in this context.
What is publish via Partition root in PostgreSQL 13?
Configuration parameter publish_via_partition_root is new in PostgreSQL 13, which allows the recipient node to have a slightly different leaf hierarchy. Mere publication creation on partitioned tables in PostgreSQL 12, will return error statements like below: ?
Why does logical replication not replicate the values?
This is because logical replication does not replicate the values for sequences since the next value of the sequence is not stored in the table itself. If you think about it logically, you can’t modify the same “autoincrement” value from two places without bidirectional synchronization.
Is it possible to selectively replicate a part of a database?
One big “feature” of streaming replication is that it’s all or nothing. All changes to all objects from all databases on the primary have to be shipped to the standby, and the standby has to import every change. It is not possible to selectively replicate a part of your database.
Why is PostgreSQL data replicated to remote sites?
The data has to be replicated continuously to ensure reports are getting the latest data. In critical environments, staleness of the data cannot be tolerated, so, the data changes happening on production must be replicated immediately to the target site.
Which is the best way to replicate data?
Replicating data via WAL records is always the most reliable and performant way to replicating data on the network. Almost all the tools in the market provide trigger-based replication except Logical Replication.
When do you need replication identity in PostgreSQL?
By default, all operation types are replicated. You must have a replication identity configured for the object that you want to add to a publication. This is in order to replicate UPDATE and DELETE operations. The replication identity can be a primary key or unique index.
Can a separate user create a Postgres role?
Although the postgres role is created by default on the Instance_1 database, a separate user should also be created who has limited access – which restricts the scope only for a given table. ? ?
How does logical replication of a table work?
Logical replication of a table typically starts with taking a snapshot of the data on the publisher database and copying that to the subscriber. Once that is done, the changes on the publisher are sent to the subscriber as they occur in real-time.