Pgdb=# SELECT EMPLOYEE_ID, DATE_OF_BIRTH FROM EMPLOYEES LIMIT 5 Īs you can see we’ve achieved to connect to the DB2 instance and get data, now we’ll see what these kinds of tables look like in PostgreSQL:Ĭolumn | Type | Collation | Nullable | Default | FDW options Pgdb=# IMPORT FOREIGN SCHEMA "DB2INST1" FROM SERVER testdb INTO public
Import table or schema definitions from a foreign server into public schema: In your particular case these values may differ.ģ. They are values created by default by the db2 wizard setup. In the next item we will see that the name of the schema is: DB2INST1.
Important: db2inst1 and my_password are DB2 database server username and password, respectively. Pgdb=# CREATE USER MAPPING FOR PUBLIC SERVER testdb OPTIONS (user 'db2inst1', password 'my_password') Define a new mapping of a user to a foreign server. Pgdb=# CREATE SERVER testdb FOREIGN DATA WRAPPER db2_fdw OPTIONS (dbserver 'testdb') Ģ. So to wrap db2 inside PostgreSQL follow the following steps: If the previous warm-up was successful then there is nothing stopping us now. Plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language +-+-+-ĭb2_fdw | 1.0 | public | foreign data wrapper for DB2 access Now we’ll create the extension in PostgreSQL, verify it and that’s it. Same steps as when installing other extensions from the source code. # db2 => SELECT EMPLOYEE_ID, DATE_OF_BIRTH FROM EMPLOYEES LIMIT 5 Īnd remember that if DB2 instance is in another network you should also add it to pg_hba.conf. # db2 connect to testdb user db2inst1 using my_passwordĭatabase server = DB2/LINUXX8664 11.5.0.0
Connection to DB2 instance with db2 tool.It must be configured properly before installing the extension. Setting up and testing the environmentįor this particular case, PostgreSQL 12.2 was used on Ubuntu 18.04.4 and the first important tip is that you need to install “IBM Data Server Client Packages”. Fortunately, the extension that we have worked on db2_fdw and with which I’ve achieved to connect to DB2 is updated and works well for its main objective: Migrating db2’s data to PostgreSQL.įrom the next paragraph and if you follow our tips you’ll also be able to read data from DB2 and expose it to PostgreSQL, so we’ll see how to do it. Sadly not all extensions are well maintained and as a consequence they are deprecated. Just by doing a simple search on GitHub with the keys “postgres” + “fdw” you can figure that out. Since SQL/MED (Management External Data) was implemented in PostgreSQL, hundreds of projects have emerged that try to connect PostgreSQL with other data sources. Db2 to postgresql db2_fdw migrating db2 to postgresql
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