Database

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Unique index in sharded cluster

For enforcing uniqueness in a sharded cluster, the officially recommended approach provided here https://docs.mongodb.com/manual/tutorial/unique-constraints-on-arbitrary-fields/#std-label-shard-key-arbitrary-uniqueness is simplistic and in product...

Guest about 4 years ago in Replication & Sharding 0 Submitted

8 VOTE

Elevate hidden replica to a voting member when quorum is lost for a Replica Set

The MongoDB engine should allow for hidden members in a replica set to be automatically elevated to a voting member. When quorum is lost and can't be met, the hidden replica is automatically reconfigured to a voting member to obtain quorum. When ...

Guest over 5 years ago in Replication & Sharding 1 Submitted

3 VOTE

TTL index throttling for deletion

To avoid deletion impact, we need to control the quantity and speed of document generations(insert). Need a way to throttle down the deletion quantity per a delete operation. i.e. # of documents per a ttl delete, sleep time between deletions(defa...

Guest about 2 years ago in Data Modeling & Indexing 0 Submitted

3 VOTE

support parallel query executions include find(), aggregation()

To use multi-core environment and enhance the query performance w/ a large amount of documents, need a parallel execution. Sharding or microsharding is not an alternative in this case.

Guest about 2 years ago in Querying & Aggregations 0 Submitted

1 VOTE

Support default values in validation

Many MongoDB users feel that default values should be supported in validation. See, for example: https://www.mongodb.com/community/forums/t/setting-default-values-in-data-schema/8411 https://www.mongodb.com/community/forums/t/support-default-value...

Guest 9 months ago in Data Modeling & Indexing 0 Submitted

4 VOTE

Budget limit for serverless pay as you go mode

I was looking at the serverless pay-as-you-go option for my DB so I could have continuous backup and snapshots but I found it too risky. Currently, the only protection user has is alerts when RPUs go over a certain budget threshold. I would like t...

Guest almost 3 years ago in Database 0 Submitted

5 VOTE

Get metadata about source client connection that submitted a given change

Currently with change streams it is impossible to know who or what connection initiated the changes. It would be a good feature to have to be able to receive some data about the source client connection that initiated a change. My particular us...

Guest over 3 years ago in Database 0 Submitted

3 VOTE

define the random seed manually, for $rand and $sample

It will be great if an additional paramater to define the seed for $rand and $sample could be use.

Guest about 2 years ago in Querying & Aggregations 1 Submitted

6 VOTE

NoTableScan at the collection level

NoTableScan at the collection level instead of mongod level.

Guest over 4 years ago in Database 1 Submitted

6 VOTE

Add expression indexes

An expression index is one where the value being indexed is the result of an expression, like lower casing a string. http://en.wikipedia.org/wiki/Expression_index http://www.postgresql.org/docs/8.1/static/indexes-expressional.html

Guest over 4 years ago in Data Modeling & Indexing 0 Submitted

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