Database
310 results found
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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. We want to make sure that writer will not impact reader in case when for some reason a lot of data arrived from external sources. So, we would like to slow down writers for the sake of readers.
Writers can saturate CPUs and IO, that's why we want an option to leave some room…
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 documents by adding additional fields, and without using JavaScript in the aggregation pipeline (for performance reasons).
The idea: add a hash function, such as md5, to aggregation pipelines. The function would accept an object/array containing the data to be hashed, and would return the hash, ideally as a number.
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 want to update the "updated" field.
This behavior is possible right now via a comment shown in SERVER-42084, but ONLY if we include the entire document, which is not acceptable when you only want to modify a single field. This document could have other fields that are numeric and are updated atomically,…
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 (not millions) of documents
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 users somewhere in the documentation, how they could achieve a boost for their own scenarios with PGO.
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.
1 vote -
Need an array query operator like elem match which matches all array nested object instead of at least one array element
as per documentation elem match query matches at least one match in array of nested object,
same we need a array query operator which returns the whole document only if elem match like criteria matches all elements in array of nested objects.
I have gone through usecase of $all with $elemMatch but it behaviour different it is like $and with $elemMatch instead excepted behaviour i am asking or excepting mentioned earlier.
https://www.mongodb.com/docs/manual/reference/operator/query/all/#use--all-with--elemmatch
https://www.mongodb.com/docs/manual/reference/operator/query/elemMatch/1 vote -
Please upgrade third_party/mozjs to esr 102
for new cpu isa (loongarch64/loong64) support , Thanks
1 vote -
Support $documents on shards
The new aggregation operator $documents cannot be used together with $merge in a sharded cluster, you get an error:
db.aggregate([ { $documents: [ { _id: ObjectId("6616b08a610fab3e84d2d4ee"), a: 'foo', shardKey: 1 }, ] }, { $merge: { into: { db: 'myDB', coll: 'sharded_Collection' } } } ])raises
$documents must run on mongoS, but cannot :: caused by :: $merge must run on a shardHaving this new function available in every environment would we great.
1 vote -
Raise an error when "majority" writes not possible
This topic is related to https://www.mongodb.com/docs/v6.0/tutorial/mitigate-psa-performance-issues/ in a PSA ReplicaSet configuration.
When you try to execute a command with writeConcern
{w: "majority"}in a three-member Primary-Secondary-Arbiter configuration where one data bearing node is not available, then the command hangs forever - unless the missing member becomes available again or you reconfigure the ReplicaSet to{votes: 0, priority: 0}on the non-available member.Instead of waiting forever, MongoDB should rollback the change and raise an error. This behavior should apply mainly for operations where
{w: "majority"}is set implicitly and cannot be changed by the user, for example at "renameCollection" issued…1 vote -
BSON::Proxy Proxy content from/to another collection
I would like a mongodb data type, called
BSON::Proxy # not indexable or searchable
Which would hold the value of another collection & id.
IE:
BSON::Proxy({database: "this_one", collection: "blobs", _id: "123"})
This would allow my code to request a field that would be used for reading ONLY IF REQUESTED in the projection.
Example record:
{
id: "abc",
username: "test user",
blob: BSON::Proxy({database: "thisone", collection: "blobs", _id: "123"})
age: 50
}db.collection.find(query, projection, options)
db.users.find({_id: "abc"}) # returns all fields except blob.
db.users.find({_d: "abc", { _id: true, username: true, blob: true, age: true }}) # returns all fields including blob.
…
1 vote -
Make redundant createView() a no-op
If I call createView() with params that match an existing view (in name and all other attributes), it returns an error. It'd be more convenient if the call simply succeeded without doing any work. The behavior I propose is analogous to the way that createIndex() behaves. With the current behavior my only choices are to (1) unconditionally drop and recreate the view, or (2) read the current view definition and see whether it matches the definition I want. The first choice is unacceptable because for a period of time (albeit a short one) the view won't exist and queries that…
1 vote -
$addToSetIfNotExists or javascript code as array operator
This would allow for unique if not last entry into arrays.
Preventing:
['one', 'one', 'two', 'three']
But allowing:
['one', 'two', 'three', 'one']
Or perhaps (to run js code on the array at the db):
`.update({}, {$js: {'array_field': 'var last = ""; for (var key in array) {if (array[key] === last) {array.splice(key);}}'});
1 vote -
Allow Dynamic Object In $project and $addFields
Assume I have a field mapping defined in some configuration collection of my application. And this field mapping varies for different clients on my application.
I would like to pass the dynamic object in my $project or $addFields stage
Like:
$project: {
{$arrayToObject: "$field_mapping"},
}{$arrayToObject: "$field_mapping"} would return something like
"email" : "$data.Email",
"phone" : "$data.Phone,
"firstname" : "$data.FirstName",
"lastname" : "$data.LastName",
"preferredchannel" : "$data.Channel",
"preferredlanguage" : "$data.LanguageCode",
"emailchannel" : "$data.Email",
"smschannel" : "$data.SMS",
"province" : "$data.CustomerState"1 vote -
1 vote
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Implement restrict Network access list to improve Security risk
Currently the Network access list admits to add IP addresses to allow connections from. However, we are using Private Endpoints to connect to our clusters; from Google Cloud we cannot add rules to PSC in the firewall, so this means that being in our VPN all devices internally has access to our mongo databases.
How can we prevent access from any place in our company to our databases. This is a huge security risk.
1 vote -
Allow for redacted and non-redacted log files at the same time
This would be applicable for on-prem and Atlas.
1 vote -
Create operators that support Centrality Algorithms use cases
Degree Centrality
Closeness Centrality
Harmonic Centrality
Betweenness Centrality
Eigenvector Centrality
PageRank
ArticleRank1 vote -
Add a $sample accumulator operator
So that it's easier to sample a number of items from each group, instead of writing lengthy DSL like this:
Ideally it can be expressed like this:
{
$group: {
_id: '$year',
samples: { $sample: 100 },
}
}
Hence making sampling 100 items from each group a snap to achieve!
1 vote -
kNN Searches with MongoDB
Dear MongoDB team,
The possibility for kNN searches within a collection would be a real game changer. Not only in machine learning, but also in other areas you need this query method to find similar structures.
Practically, it could go in the same direction as text searches. So that you have to create an index that you can also query similarly and then sort according to the score.I speak from my own suffering, as I had to switch from MongoDB to Open-/Elasticsearch for my current project, as they are also non-relational databases but support kNN searches. However, I like…
1 vote
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