![]() ![]() Oracle_FDW does an automatic conversion of Oracle data types to an appropriate postgres data type and creates tables and views with the same structure as of the Oracle schema.įollowing is an example of how the schema : HR of an Oracle database : xepdb1 running on host : 192.168.10.1 is being migrated to PostgreSQL using oracle_fdw. Using the IMPORT FOREIGN SCHEMA syntax, a schema similar to Oracle can be created in the postgres database. Some of the database migrations from Oracle like databases can be simply done using oracle_fdw like foreign data wrappers. Optimization of remote queries to reduce the amount of data transferred between the servers.Īdvantages of FDW(s) while migrating to PostgreSQLįollowing are some of the advantages of foreign data wrappers while migrating to PostgreSQL.This helps a user to SELECT FROM or WRITE TO a remote homogeneous/heterogeneous database from a Postgres database.Īs seen in the following image, we can join an Oracle table with a Postgres table using Oracle FDW on a postgres server.įeatures offered by some of the foreign data wrappers Using FDW(s), objects of a heterogeneous database can be transparently mapped to PostgreSQL. MED stands for Management of External Data, the data that is accessible but not managed by the DBMS itself. SQL/MED is one of the standards that was originally defined as part of the SQL standard updated in 2003 (SQL:2003). Foreign Data Wrappers (FDW)Īs of the most recently updated SQL standard, ISO/IEC 9075:2016 aka SQL:2016, PostgreSQL tops the compliance chart when compared with Oracle, DB2, SQL Server and MySQL, qualifying 170 of the 177 SQL standards. In this blog post, we are going to discuss just one of those features. Fortunately, there are several contributions through extensions and Open source tools that made migrations to PostgreSQL very easy. While it is great that there are several features available with Postgres by default, it may be challenging if there are no solutions to help with migrations to postgres. Enterprise Grade Monitoring for your PostgreSQL using open source tools.Logging and analyzing the logs using Open Source tools in PostgreSQL.Scaling PostgreSQL using connection poolers and load balancers.Robust PostgreSQL backups using built-in and open source tools.High availability and Automatic Failover in PostgreSQL.Securing your PostgreSQL database cluster using built-in mechanisms.I have presented and also blogged about some of the rich enterprise features as following, those are otherwise available for an additional cost with some commercial databases. This is because of the liberal PostgreSQL license in particular that invited more contributions to PostgreSQL and eventually made it Enterprise Grade. Millions of databases are being migrated to PostgreSQL today. ![]()
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