STACKIT MongoDB Flex

STACKIT MongoDB Flex is a managed NoSQL database service providing flexible schema document storage hosted in ISO/C5-certified data centers.

Service Overview

• Dynamic Schema Flexibility: Stores complex JSON-like documents ideal for agile microservices and e-commerce.
• High Availability: 3-node Replica Sets with automatic failover and zero-downtime storage scaling.
• Advanced Recovery: Features Point-in-time recovery (last 30 hours) and instant live instance cloning.

Technical Details

• Deployments: Single Node, 3-Node Replica Set, and 9-Node Sharded Clusters across customizable performance tiers.
• Security: Dedicated IPv4 ACL allowlists, TLS transport encryption, and Prometheus metric scraping endpoints.

Performance Classes and Limits

The values below come from the STACKIT documentation and update themselves.

From the STACKIT docsFlavors and performance classes of MongoDB Flex › Performance classesSource updated 06.07.2026 · copied 05.10.2026

Swipe sideways to see the whole table

Description	ID	Max. IOPS	Max. throughput (MB/s)
Performance class 2	premium-perf2-mongodb	1000	100
Performance class 4	premium-perf4-mongodb	2000	150
Performance class 6	premium-perf6-mongodb	5000	200
Performance class 8	premium-perf8-mongodb	10000	250
Performance class 10	premium-perf10-mongodb	15000	300
Performance class 12	premium-perf12-mongodb	20000	350

STACKIT offers three types of instances. For each type there are different flavors available.

If your flavor is too small, you can upgrade it to a bigger one. It is only possible to upgrade from a replica set flavor to another replica set flavor, and from a single instance flavor to another single instance flavor. It is not possible to upgrade from a single instance flavor to a replica set flavor.

MongoDB recommends the use of at least 4 GB of RAM in its Deployment prerequisites. A flavor with less than 4 GB RAM may not provide the required stability for a production system.

What is this?

This section is copied from the STACKIT docs automatically, several times a day. It cannot be changed here. Changes belong in the STACKIT docs.

From the STACKIT docsPlan your MongoDB Flex instance › LimitationsSource updated 22.05.2026 · copied 05.10.2026

You can consult Architecture of MongoDB Flex for the limitations in flexibility. For a reference, you can consult this table:

Swipe sideways to see the whole table

Parameter	Downgrade possible	Upgrade possible	Downtime
type	No	No	N/A
flavor	Yes	Yes	Yes
performance-class	Yes except single- and sharded-instances	Yes except single- and sharded-instances	Yes
storage-size	No	Yes	No
version	No	Yes	Yes

You can make changes to ACL and backup settings without any limitations and without downtime.

What is this?

This section is copied from the STACKIT docs automatically, several times a day. It cannot be changed here. Changes belong in the STACKIT docs.

From the STACKIT docsArchitecture of MongoDB Flex › BackupSource updated 22.05.2026 · copied 05.10.2026

You manage your backups on the instance level. The system backups the transaction logs and creates snapshots. With the help of transaction logs you can recover every point-in-time for the last 30 hours. With the snapshots you can recover to specific consistent snapshots of your instance in the past.

Recovery Point Objective (RPO) and Recovery Time Objective (RTO) are both 6 hours for storage under 1 TB. RTO increases slightly for each additional 10 GB over 1 TB.

With instance cloning you can replicate your existing MongoDB Flex instance to another instance within the same project for testing, staging, or data recovery workflows.

What is this?

This section is copied from the STACKIT docs automatically, several times a day. It cannot be changed here. Changes belong in the STACKIT docs.

Limitations & Constraints

• No Architecture Downgrades: Single-node instances cannot be upgraded in-place to Replica Sets; storage size cannot be reduced.
• Short Upgrade Downtime: Adjusting machine flavors or engine versions causes brief connection interruptions (except pure storage expansion).

STACKIT documentation docs.stackit.cloud STACKIT MongoDB Flex Documentation Open the documentation