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Add support for all type of joins like Postgres has and improve performance

$lookup is a performance killer. Joins are crucial parts in every OLTP system. $lookup is the equivalent to join in SQL, however $lookup is slow, doesn't support hash joins or other efficient join algorithm implemented in Postgres for example. Se...

Guest over 1 year ago in Performance & Optimization 1 Submitted

9 VOTE

Data Replication from one MongoDB Cluster to another MongoDB Cluster

Create an option for the user to replicate data from one MongoDB Cluster to another MongoDB Cluster inside the account. We don't need to migrate data, I need replicate data from an Production Cluster to an Dev/Test Cluster. Thanks.

Guest almost 5 years ago in Replication & Sharding 0 Submitted

6 VOTE

Implement $bucket and $group on indexed values with sub-linear runtime

We noticed that sum $bucket and $group aggregations such as $min, $max, $count are unexpectedly slow even when fully covered by an index, (partially) because the DB scans through the entire index rather than employing optimization approaches such ...

Guest over 3 years ago in Performance & Optimization 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 almost 6 years ago in Replication & Sharding 1 Submitted

6 VOTE

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 over 4 years ago in Replication & Sharding 0 Submitted

1 VOTE

Provide a dictionary for matched/modified/deleted counts for bulk writes

Current bulk write operations provide only aggregated counts that look like this: ``` { acknowledged: true, insertedCount: 0, insertedIds: {}, matchedCount: 2, modifiedCount: 2, deletedCount: 0, upsertedCount: 0, upsertedIds: {} } ``` All ...

Guest about 1 year ago in Performance & Optimization 0 Submitted

1 VOTE

deleteMany() execution automatically disable the balancer on sharded clusters

Marco Barbierato about 1 year ago in Replication & Sharding 0 Submitted

1 VOTE

Execute $group on shardPart instead of mergerPart

Basically what is described here: https://www.mongodb.com/community/forums/t/how-to-enforce-mongodb-to-execute-group-on-shardpart-of-the-execution-plan/267560 When running covered count queries that could be aggregated independently on the shards...

Guest about 1 year ago in Performance & Optimization 0 Submitted

1 VOTE

Parallelize unionWith

Today $unionWith aggregation command is executed sequentially. EG first we query collection A and then collection B and then the union occurs. The process should be parallelized so the query part will run in parallel while the union will be done a...

Guest almost 2 years ago in Performance & Optimization 0 Submitted

1 VOTE

Scheduled stepdown for smoother primary election

Stepdown is a great tool that allows us to keep clusters operating smoothly. We use it for example when we want to perform some maintenance work on the host where the primary is currently running, to perform a rolling upgrade, and in many other ca...

Guest almost 2 years ago in Replication & Sharding 0 Submitted

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