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314 results found

  1. ARM support

    Can we support ARM packages for Debian 11. They are required for bitnami to add ARM support to their mongo charts

    30 votes
    3 comments  ·  Administration  ·  Admin →
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  2. Extend schema validation to be able to enforce referential integrity between collections

    Where a relational database uses 2 tables to store a 1:many "parent - child" relationship between entities, MongoDB mostly stores the child documents in an array file as part of the parent document. This automatically ensures referential integrity in that
    - a child document cannot be inserted or updated to refer to a non-existent parent, and
    - a parent document cannot be deleted such that it leaves "orphaned" child documents

    However, there are situations where the number and/or size of the child documents makes embedding them all in their parent unworkable, due to the 16 megabyte document size limit if…

    4 votes
    0 comments  ·  Data Models  ·  Admin →
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  3. 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.

    1 vote
    0 comments  ·  Query and Aggregation Pipeline  ·  Admin →
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  4. geo

    It would be nice to get the length of an LineString of a geo-json object or the possibility to write an aggregation to calculate it.

    2 votes
    0 comments  ·  Query and Aggregation Pipeline  ·  Admin →
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  5. Unique Indexes and Bulk Upserts for Time Series Collections

    We would like to insert data in bulk into time series collections and identify the new data that has been inserted without the possibility of duplicates being inserted.

    For regular collections this is achievable by adding a unique index and performing a bulk upsert (as any duplicates will be rejected due to the unique index).

    For time series collections however unique indexes are not currently supported.

    In addition performing an upsert with $setOnInsert option which should only action insert operations is also not currently supported for time series collections.

    At the moment the only options appear to be:

    (1) to…

    12 votes
    0 comments  ·  Time Series  ·  Admin →
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  6. 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 to be able to set a budget limit that would prevent me from going over pre-set daily budget. If you would get hit with DOS or some other brute force attack you could rack up lots of traffic and get an unexpected bill without a potential limit.

    4 votes
    0 comments  ·  Administration  ·  Admin →
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  7. 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" till mydb.mycoll in new and current cluster are synced.
    Very much like how reshardCollection works now, but to a remote
    mydb.mycoll on the new cluster, instead of the local coll
    system.resharding.554c8995-2ec9-4bda-9401-a3ad475b9c8c

    This is a combination of mongosync and reshardCollection in one.
    Prod cluster is often very big and busy and requires no downtime with the
    99.999 SLA (Service level agreement). Being able to reshardCollection
    to…

    1 vote
    0 comments  ·  Sharding  ·  Admin →
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  8. 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
    0 comments  ·  Performance  ·  Admin →
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  9. 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
    0 comments  ·  Query and Aggregation Pipeline  ·  Admin →
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  10. $dateDiff operator should be useful to calculate age

    In the documentation it says: " For example, two dates that are 18 months apart would return 1 year difference instead of 1.5 years.". But if startDate is 2021-08-01 and endDate is 2023-02-01, the result is 2 years difference. I think it should be good if this operator could be used to calculate the age.

    2 votes
    1 comment  ·  Query and Aggregation Pipeline  ·  Admin →
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  11. $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
    0 comments  ·  Query and Aggregation Pipeline  ·  Admin →
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  12. 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
    0 comments  ·  Performance  ·  Admin →
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  13. 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 as binary search.

    An example pipeline that should return instantaneous but scans through the entire index (confirmed on v4.4 and v5):
    [
    {
    $match: {
    status: "DELIVERED",
    },
    },
    {
    $group: {
    id: {
    status: "$status",
    },
    min: {
    $min: "$modify    time",
    },
    },
    },
    ]
    with an index { status: 1, modify_time: 1}

    Another example is $bucket (same index):
    [
    {…

    6 votes
    0 comments  ·  Performance  ·  Admin →
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  14. Support compound/multiple grouping keys in $bucket

    We often need to compute statistical/summarizing aggregations grouped by more than one field where all fields are of a $bucket-able type.

    An example, would be to count all orders grouped by their status and some custom time ranges of their creation date.
    This can be achieved by using $group in combination with a $switch expression (sometimes simplified with $trunc), however, that is cumbersome and prevents efficient grouping since e.g. no binary search can be employed to identify the bucket boundaries efficiently.

    The query syntax of $bucket would not need to change much. It would simply need to allow for nested…

    6 votes
    0 comments  ·  Query and Aggregation Pipeline  ·  Admin →
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  15. 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
    1 comment  ·  Performance  ·  Admin →
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  16. 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
    0 comments  ·  Data Models  ·  Admin →
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  17. Use a private peering that resolves to the private IP address of your LDAP server.

    We need to consume an LDAP server traffic through Private Endpoints. In the documentation we find that only creating a public endpoint it's possible but we have a security restriction. Our TAM suggested create a feedback request to the product owner.
    tks!

    4 votes
    0 comments  ·  Security  ·  Admin →
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  18. sharding error shardsvr

    Make it clear which node is causing the "shardsvr" error.

    Spawned from support case 01042995

    Our error occurred when the user tried to connect using Compass. The failure was to list the collection names on one database.

    The error presented back to the user was merely Cannot accept sharding commands if not started with --shardsvr

    We found eventually that the primary changed on one of the shards, and that primary did not have the appropriate clusterRole in the mongod.conf file. My concerns are that this took too long to track down and would be impossible in a 100-shard environment.

    • Nothing…
    6 votes
    0 comments  ·  System Observability  ·  Admin →
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  19. Nanosecond timestamp support

    I've put this under the time series category since that's where it's most applicable, but it's really a data model / BSON issue.

    The topic of higher resolution timestamps have been surfaced from time to time for at least a decade (https://jira.mongodb.org/browse/SERVER-1460), and usually prompts a response like "just use integers". With the addition of time series collections however, where the concept of time is integral to database functionality, I think it's time to reconsider adding a type with at least nanosecond precision timestamp support. Date's millisecond resolution is woefully inadequate for a number of relevant use cases,…

    9 votes
    1 comment  ·  Time Series  ·  Admin →
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  20. maintenance period per cluster

    There are some times when a maintenance is potentially super disrupting such as when node replacements occur due to AZ rebalancing. It would be nice if we can set the maintenance period per cluster vs per project to be able stagger maintenance periods. so that not every cluster goes under such disruptive maintenance.

    0 votes
    0 comments  ·  Administration  ·  Admin →
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