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Questions tagged [memgraphdb]

Use this tag for questions related to Memgraph streaming graph database.

Memgraph is an open source graph database built for real time streaming data, compatible with Neo4j. It is an in-memory graph database that uses Cypher as a query language. Memgraph can be extended with graph algorithms that are part of Memgraph Advanced Graph Extensions (MAGE). Graphs can be visualized using Memgraph Lab application.

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Which graph algorithms are available in Memgraph?

I know that there are like 100s of graph algorithms out there. Which one are available in Memgraph? Is there some command like help list algorithms that would tell me what can I use?
KWriter
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How can I delete all of the nodes and relationships from the Memgraph database?

I want to delete all of the nodes and relationships from the Memgraph database. I know that could create a whole instance, but I don't want to do that. Which Cypher query can I use to delete the content of the Memgraph database?
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What are query modules in Memgraph?

I keep coming across the term "query module" in blog posts related to Memgraph. What are query modules and when should I use one?
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Styling graphs in Memgraph Lab

When I generate graph using Memgraph Lab I get something that looks like this: I would like to change the styling of nodes and relationships. How can I do that?
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Memgraph is an in-memory database. Does that mean that data is lost when I shutdown the computer?

Memgraph is an in-memory database. Does that mean that data is lost when I shut down the computer? Do I need to use GQLAlchemy library as an on-disk storage solution to ensure data persistence?
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What is the fastest way to import data into Memgraph from MySQL database?

I have a rather large dataset (a few million nodes and relationships) in the MySQL database. I want to import that data into Memgraph. What is the fastest way to do the import?
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Does Memgraph support Resource Description Framework (RDF)?

I have data in one RDF project. I'd like to transfer it to Memgraph. Does Memgraph support Resource Description Framework (RDF)?
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Should I index all all of the data and how can I enable it in Memgraph?

I've used indexes in mySQL databases and I know how indexes work. I used indexes to get better performance from the database. I know that there could be downsides if too much data is indexed. What is the situation with Memgrah since it is a graph…
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Can Memgraph use disk as a storage?

Memgraph is an in-memory graph database. I have a large database with nodes and relationships with metadata that doesn’t need to be used in any graph algorithms that need to be carried out in Memgraph. Is there a way to store that data on the disk…
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Running two Docker instances of Memgraph at the same time

I want to run to Docker instances of Memgraph at the same time. I want to have one that has persistence turned on so that I don't lose all of the data on each restart, and I want one where I will lose all of the data. I use the second one for quick…
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How to limit memory usage when I run Memgraph Platform within Docker?

I've been running Memgraph for a few days now and everything is working as expected. This is the first time that I'm using Docker. I've noticed that when I shut down the Memgraph Platform my RAM is still used. I need to restart my computer to free…
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What to do when Memgraph stops working without any info?

Sometimes the Docker container where Memgraph is running just stops working or says that the process was aborted with exit code 137. How can I fix this?
Ivan Despot
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Creating a password-protected account for non-enterprise Memgraph instance

I am using Memgraph 2.1.1 and I am wondering if there's any way to set the password for my non-enterprise instance?
KateLatte
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Cypher query aborts/stops and the memory consumption is not going down

My query aborts with the memory limit exceeded. Memgraph keeps running, but even though the query was aborted, the memory isn't getting freed. How do I reset this behavior?
Ivan Despot
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What cypher query can find what I need?

We have some people (for example 70 persons) and some tables (for example 4 tables). the people visite each other on each table. (for example the capacity of tables are 20,20,20,10). After the first session they stand up and again sit randomly. we…
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