Questions tagged [nosql]
A catch-all term describing database systems using various non-relational models. Such systems are usually engineered to be high-performance.
426 questions
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How to debug MongoDB recurring error 314 ObjectIsBusy
On a fresh Mongo DB 8.0 mono instance (no cluster) community edition install on Debian and through the package manager, i have a recurring error message in my logs saying this:
"c":"...
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GridDB Time-Series Retention: Built-in TTL or recommended purge/archival pattern?
We ingest time-series sensor data into a GridDB TimeSeries container on GridDB Cloud (Free plan). I’m trying to keep only the most recent N days (e.g., 90 days) online with minimal impact on ingest ...
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Do I need a secondary index on a non–row-key column for this query, and how do I create/verify it?
I’m testing GridDB Cloud with a 3-column Collection container:
field
type
sensor_id
STRING row key
temperature
FLOAT
recorded_at
TIMESTAMP
I insert a row and then query by a non–row-key column:
...
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Best Database for Bulk Reads and Fast Key Lookups for Genomic Data [closed]
I'm developing a system to store and query genomic data using a relational database (PostgreSQL being my primary candidate).
The dataset is quite large around 9 billion records with over 300 columns, ...
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How to manage indexes not fitting into memory in Document DB?
The problem: from time to time i get slow (>10s) queries even though they are using based on indexed fields.
I'm using DocDB instance that has 128GB of memory. The total size of all of the indexes (...
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Unexpected Behavior with TimeWindowCompactionStrategy in ScyllaDB 6.1 Open Source
I’m using ScyllaDB 6.1 Open Source and have a table configured to store 30 days of data with the following compaction strategy:
compaction = {
'class': 'TimeWindowCompactionStrategy',
'...
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4
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Why do NoSQL databases tend to favor availabilty instead of consistency?
From my current limited understanding of NoSQL databases, it seems like there are two basic elements.
First, how they store data compared to SQL databases. NoSQL databases store a blob of data, ...
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MongoDB starting then crashing
I was recently forced to remove and reinstall MongoDB on my web server, which is a VM running Ubuntu 20.04.6 LTS. Before I erased all of the previous MongoDB files, I copied the data directory /var/...
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How to fix mongosh v2.3.3 connection error with AWS DocumentDB v5.0.0
When I try to connect to documentdb cluster version 5.0.0 using mongosh version 2.3.3 it is returned the error message:
MongoServerError: Unsupported mechanism [ -301 ]
I am using the connection ...
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Seeking Fastest Hash-Based NoSQL Database: GDBM vs Kyoto Cabinet & Other Alternatives
Background
I'm currently researching fast, hash-based key-value NoSQL databases for my use case, which requires high performance. I was surprised by the limited availability of benchmarks, ...
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After RAVENDB upgrade, the server can't see my databases
I just upgraded my Raven DB from 6.0.1 to 6.0.105.
I did so by downloading the 105 server, unpacked and copied it over my previous instance.
I was able to create a new database, but the server can't ...
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Limit MongoDB Database Size/Quota
I'm running the latest version on Docker(Mongodb server 7.0.11), and I'd like to know: Are there any mechanisms to limit the size of a single database on MongoDB? Or perhaps a way to impose a storage ...
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Which Python 2.7.x version is compatible with both Cassandra 3.11 and 4.1?
I'm upgrading Cassandra from 3.11 to 4.1. One of the requirements is the latest python 2.7 updates. I want to upgrade Cassandra with no downtime, so I need to know which python 2.7 update is ...
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If SSTable sorted, why do we need Sparse Index?
As far as I know, when we create clustered index it restructures the table in B-Tree form and uses binary search when we try to find particular row. SSTable is also sorted by key. Why do we need ...
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RDBMS vs NoSQL decision making
I am pretty novice when it comes to data store, and want to learn few tricks.
I want to know how to decide between RDBMS and a NoSQL store.
Lets take example of a system where data size is pretty big, ...
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