Migrate PostgreSQL database to Memgraph

Prerequisites

• A running PostgreSQL instance with the database you wish to migrate.
• A running Memgraph instance where you want to migrate the data.
• The mgmigrate tool installed. Installation instructions can be found here.

How to migrate data from PostgreSQL to Memgraph?

Dataset

For this tutorial, we will be working with a PostgreSQL database named users_db that contains two tables, users and user_relationships:

Table 'users'

The users table contains four users with their ids and names:

users_db=# SELECT * FROM "users";
 id | name
----+------
  0 | Anna
  1 | Josh
  2 | Lisa
  3 | Troy

Table 'user_relationships'

The user_relationships table contains the relationships between users:

users_db=# SELECT * FROM user_relationships;
 user_one | user_two
----------+----------
        0 |        1
        2 |        3

---

Migrating

1. You can migrate this database into Memgraph by running:

build/src/mgmigrate --source-kind=postgresql /
  --source-host 127.0.0.1 /
  --source-port 5432 /
  --source-username postgres /
  --source-password postgres /
  --source-database=users_db /
  --destination-host 127.0.0.1 /
  --destination-port 7687 /
  --destination-use-ssl=false

2. Run the following query in Memgraph Lab or mgconsole to see the results:

MATCH (n)-[r]-(m) RETURN n,r,m;

The query results should be:

mgconsole

memgraph> MATCH (n)-[r]-(m) RETURN n,r,m;
+--------------------------------+--------------------------------+--------------------------------+
| n                              | r                              | m                              |
+--------------------------------+--------------------------------+--------------------------------+
| (:users {id: 1, name: "Josh"}) | [:user_relationships]          | (:users {id: 0, name: "Anna"}) |
| (:users {id: 0, name: "Anna"}) | [:user_relationships]          | (:users {id: 1, name: "Josh"}) |
| (:users {id: 3, name: "Troy"}) | [:user_relationships]          | (:users {id: 2, name: "Lisa"}) |
| (:users {id: 2, name: "Lisa"}) | [:user_relationships]          | (:users {id: 3, name: "Troy"}) |
+--------------------------------+--------------------------------+--------------------------------+

Memgraph Lab