Database

Per-Shard Change Stream and Triggers to improve scalable/performance/resilience

In our geo-sharded cluster, we use Change Streams and Atlas Triggers. Most of our pipelines include a match for the shard key - so we can process the data in the same region where the data resides. However, due to the design of change streams wit...

Boris Figovsky about 1 year ago in Database / Replication & Sharding 1 Submitted

8 VOTE

Lock on session start level with provided keys

Scenario: Parallel DB updates with transactions on multiple collections that use same documents. Example: Calculate some common stuff to embed it in extra collections to avoid lookups. Problem: Lock and timeout on documents uses up valuable time ...

Guest about 3 years ago in Storage & Transactions 0 Submitted

2 VOTE

It would make my life a lot easier if I could have some type of uniqueness constraint on data in time series collections. I frequently have to over fetch data and store that in the database. If I could insert and only upload the new stuff that would be amazing.

What problem are you trying to solve? Focus on the what and why of the need you have, not the how you'd like it solved. Time series data uniqueness What would you like to see happen? Describe the desired outcome or enhancement. some...

Sam Cox 10 months ago in Data Modeling & Indexing 1 Future Consideration

11 VOTE

Raise the limit of 16 MB JSON between aggregation stages

When doing analytics, the 16 MB JSON limit between aggregation stages restricts the ability to process large amount of data. allowDiskUse does not help with all the various $operators and stages that we use. See ticket 00774514 for details.

Guest over 4 years ago in Querying & Aggregations 0 Submitted

3 VOTE

Native Support for Date-Only and Time-Only Field Types

### Summary MongoDB currently lacks native field types for **date-only** (e.g., `2025-05-28`) and **time-only** (e.g., `13:45:00`) values. This results in frequent developer confusion, incorrect behavior around time zones, wasted storage, and the...

Guest over 1 year ago in Data Modeling & Indexing 0 Submitted

9 VOTE

Handle Daylight Saving Time when $densify is used on a date field

When using "day" as "unit" for a $densify pipeline stage on a date field, the date is always advanced of 24 hours. This is however not always the expected result in timezones in which the year has one 23-hour and one 25-hour long day, because of D...

Guest almost 4 years ago in Querying & Aggregations 1 Submitted

14 VOTE

More complex balancer windows for sharded clusters

Currently we can define a single balancer window which is applied for every day of the week. It would useful to extend this with, for example: - multiple windows per day (e.g. 2-4am and 9-11pm) - custom windows for days of the week (e.g. Sat 5p...

Guest over 6 years ago in Replication & Sharding 0 Submitted

11 VOTE

Rename an existing index

Allow for the possibility of renaming an existing index, without having to drop and recreate it. Let us say a unique index exists in production, it might not be possible to safely drop it. Yet the index name might not be ideal.

Guest about 5 years ago in Data Modeling & Indexing 2 Submitted

11 VOTE

Identification of unused/less used collections

As a DBA I'd like to identify unused collections so that I can remove them to optimize performance. As of now there doesn’t seem to be a direct way. One option could be to settup auditing or using logging (e.g. set the slow op timer to 0 so we log...

Guest over 5 years ago in Database 1 Submitted

13 VOTE

Burstable IOPS for MongoDB Atlas on Azure

According to Azure documentation, bursting is enabled by default for all VMs that using Premium SSD (https://docs.microsoft.com/en-us/azure/virtual-machines/linux/disks-types#bursting). It would be great if MongoDB Atlas on Azure can get benefit f...

Guest over 6 years ago in Database 0 Submitted

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