How does table level replication work in PostgreSQL?
Table-level replication is the mechanism of replicating the data of a specific table or set of tables from one database (source) to another database (target) hosted remotely in a distributed environment. Table level replication ensures table data is distributed continuously and remains consistent across replicated (target) sites.
How to migrate a table from one PostgreSQL database to another?
Connects to the source and destination databases. Reads a list of table names from an array. It gets the schema data for each table using the PostgreSQL INFORMATION_SCHEMA and the table data using a simple SELECT *… query. Dynamically creates and executes the DROP TABLE…CREATE TABLE… query.
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.
How to migrate data from one database to another?
So in essence we had to create a script that would migrate a list of tables, schema and data, from one database to another without having to specify the exact schema for each table. Fortunately a l l SQL databases have the INFORMATION_SCHEMA em…schema.
How to replicate data using GoldenGate PostgreSQL?
Oracle recommends that you create a specific schema for Oracle GoldenGate. Create a checkpoint table and add the Replicat to the Oracle GoldenGate installation. Start the Replicat and verify that all processes are running. The Oracle GoldenGate bidirectional replication is supported on PostgreSQL.
What’s the difference between logical replication and Wal based replication?
Logical Replication or Pglogical is a table level, WAL based replication mechanism which replicates the data of specific Tables between two PostgreSQL instances. There seems to be a confusion between “pglogical” and “Logical Replication”. Both of them provide the same kind of replication mechanism with some differences in features and capabilities.