If you reach 100% of the physical (disk) storage with your Neo4j Aura instance, it will be placed into a read-only mode. This will result in all new write operations (including deletions) failing, in order to protect the integrity of your existing data and limit the potential for damage to occur.

For reference, please note that you can monitor your instance within the Aura console as explained here.

Next Steps

At this stage your instance is essentially stuck, it is important to note that whilst your instance is in the read-only state we will not be able to take backups, as it is not possible to increase the physical storage.

Therefore it is essential to act quickly in these circumstances.

Professional, Business Critical and Virtual Dedicated Cloud tiers

One of the following actions is required to prevent data corruption/loss and ensure the continuation of smooth operations going forward:

• Perform compaction of your database store (an offline process), as outlined in the knowledge base articles,
  • How to use Neo4j Desktop to compact your Aura instance's database store
  • Performing data store compaction (using an AWS EC2 instance)
• GCP & AWS customers who did not purchase Neo4j Aura via the Cloud Service Provider marketplace, you can adjust the storage for your instances via the Neo4j Aura Console, refer to product documentation
• Resize the instance to a larger instance, as outlined in the knowledge base article Resize your Neo4j AuraDB instance

Free tier

As it is not possible for us to increase the size of the underlying physical storage, there are currently two options available once your instance has been placed into the read-only state,

• You could use the Upgrade button in the Neo4j Aura console, to upgrade your instance to either the Professional or Business Critical tiers. Remember to select an instance size that is larger than your current instance which has run out of resources (disk storage).
• Download the last available dump.
  • delete this instance.
    • create a new one and upload the dump from the original.

The Excess Usage section of the Self-Serve Aura Terms of Service state that you have a responsibility to use an appropriately sized instance for your workload to avoid causing disruption to other users of the service.