Query modules overview
Memgraph supports extending the query language with user-written procedures in
C, C++, Python, and Rust. These procedures are grouped into
modules - query modules files (either *.so or .py files).
Some query modules are built-in, and others, like those that can help you solve complex graph issues, are available as part of the MAGE library you can add to your Memgraph installation. The library is already included if you are using Memgraph Platform or Memgraph MAGE Docker images to run Memgraph.
You can also implement custom query modules. Every single Memgraph installation
comes with the example.so and py_example.py query modules located in the
/usr/lib/memgraph/query_modules directory. They were provided as examples of
query modules for you to examine and learn from.
Each query module file corresponds to one query module, and file names are
mapped as query module names. For example, example.so will be mapped as
example module, and py_example.py will be mapped as py_example module. If
each module file has a procedure called procedure defined, those procedures
would be mapped in the Cypher query language as example.procedure() and
py_example.procedure() respectively.
Regardless of where they come from and who wrote them, all modules need to be loaded into Memgraph so that they can be called while querying the database. They are either loaded automatically when Memgraph starts or manually if they were added while Memgraph was already running.
To learn more about query modules, take a look at the following guides:
- Available query modules - MAGE
- Implement custom query modules using:
- Load and call query modules
- Manage module files from Memgraph
The open-source repository MAGE (Memgraph Advanced Graph Extensions) contains all currently implemented query modules. For more information on all the available graph algorithms and installation instructions, check out the MAGE documentation page.