Database

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Lock the document field (not the entire document)

Hi according to this reference: https://www.mongodb.com/blog/post/how-to-select--for-update-inside-mongodb-transactions When I lock a document with a field with a new ObjectID, the whole document is locked! Idea : Operations: i have three fiel...

Guest almost 3 years ago in Storage & Transactions 0 Submitted

1 VOTE

Improve the mongo query language

Sometimes I find Mongo query language as not put very well together, sometimes it feels like a patch job. It would be nice, if you could make you query language easier to reason about. It would be awesome, if you could introduce fluent style api b...

Guest almost 3 years ago in Querying & Aggregations 0 Submitted

1 VOTE

Add functionality to specify the readConcern level at db.collection.findOne()

Add functionality to specify the readConcern at db.collection.findOne(). At the version 5.0.14 it's not supported.

Guest almost 3 years ago in Querying & Aggregations 0 Submitted

1 VOTE

Combine reshardCollection+mongosynd idea to support a remote collection on a separate new cluster

Great for prod productivity and 99.999 SLA if mongo could support this, for example, Given "mydb.mycoll" in current cluster being sharded with {zip:1} shard key 1/ New cluster: sh.shardCollection( "mydb.mycoll", {name:1, phone:1} ) 2/ "Mongocopy...

Guest almost 3 years ago in Replication & Sharding 0 Submitted

1 VOTE

throttle sessions which use too much resources

We have different types of applications : 1. Writer - to load data into mongodb from different data sources 2. Reader - to read data and display to end user. Normally, there is strict SLA for reader , but no SLA (or less restricted) for writers. ...

Guest almost 3 years ago in Performance & Optimization 0 Submitted

1 VOTE

Add hash function (eg. md5) to aggregation pipeline

I would like to implement hash-based sharding in my own application on top of MongoDB. For that purpose, I would like to pull a stable pseudorandom subset of documents into each of my servers, and I would like to do so without enlarging the docume...

Guest almost 3 years ago in Querying & Aggregations 0 Submitted

1 VOTE

Improve sorting performance

Sorting always ends up doing a collection scan when the selected index for the find/match does meet the sort requirement. The sort effectively makes the performance worse by 15-25 times for the "matched" dataset which runs into 10s of thousands (n...

Guest about 3 years ago in Performance & Optimization 0 Submitted

1 VOTE

$currentDate option to only update if the document was modified

A common pattern in a data model is to have a field that denotes when the data was last modified. For this example, let this field be called "updated". I want to toggle a field on a document called "enabled", and if the value is modified I also wa...

Guest about 3 years ago in Querying & Aggregations 0 Submitted

1 VOTE

Build MongoDB with PGO

I would like to see support for PGO (and even LLVM Bolt) in the upstream. Would be awesome if MongoDB will distribute PGO-optimized binaries, so the users will be able to see an additional performance boost "for free". At least describe to the use...

Guest about 3 years ago in Performance & Optimization 1 Submitted

1 VOTE

UTF 16 and UTF 32 support

Currently MongoDB only support UTF 8 strings but it will be great if there is a configuration to change UTF 16 or UTF 32.

Guest about 3 years ago in Data Modeling & Indexing 0 Submitted

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