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NoSQL

A NoSQL database refers to a database whose storage format is modeled differently from relational databases. Often NoSQL databases opt for simpler horizontal scaling to clusters of servers. NoSQL databases are often used for large data web applications.

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treemanzhou
treemanzhou commented Jul 15, 2018

2018/07/14 00:26:24 main.go:279: [WARN] ncpu = 8 -> 10, usage = [0.412, 0.392, 0.377, 0.359, 0.387, 0.505, 0.519, 0.559, 0.617, 0.705]
2018/07/14 00:27:04 main.go:279: [WARN] ncpu = 10 -> 9, usage = [0.074, 0.068, 0.090, 0.079, 0.218, 0.177, 0.097, 0.117, 0.193, 0.195]
2018/07/14 00:27:14 main.go:279: [WARN] ncpu = 9 -> 8, usage = [0.176, 0.158, 0.218, 0.201, 0.132, 0.185, 0.162, 0.117, 0.151, 0

oliverlockwood
oliverlockwood commented Apr 1, 2020

On a sharded collection, if you try to create a custom index (e.g. hash index) with uniqueness, that doesn't include the sharding key (which by default is the autogenerated _key) then it will fail with an error like:

Index creation failed: shard key '_key' must be present in unique index

There's zero documentation that I could find around this, and it's fairly fundamental, since you can't

luanne
luanne commented Feb 10, 2020

When using the cypher-shell with fabric, one has to first switch to the system database to be able to then switch to the fabric database

Neo4j Version: 4.0.0
Operating System: MacOS Mojave

Steps to reproduce

  1. Configure fabric e.g. fabric.database.name=example
  2. Start the cypher-shell
  3. Try :use example

Expected behavior

Should switch to the example database

tomazk8
tomazk8 commented Apr 6, 2020

OrientDB Version: 3.0.30 community
Java Version: 1.8.0_211
OS: Windows 10 Pro

I created Windows Service as specified on OrientDB website and works. Service is installed, I started it and OrientDB Studio works. But when I try to stop it using Windows Services or using OrientDBGraph.exe //SS, it's just waiting and waiting. In Services I see the state "stopping" but only after some 5min, state f

nonamewolf
nonamewolf commented Feb 14, 2020

(e.g - macOS):

  1. Create a section with installation steps:
  • brew install cmake autoconf libtool gcc automake openssl
  • export PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"
  1. Update README.MD
  2. Update build.sh(force linking openssl doesn't work anymore)

I've wasted a lot of time trying to resolve openssl dependency issue, by applying solutions which are not relevant any

lightandshadow68
lightandshadow68 commented Jun 21, 2018

Is it possible to include the "type" property value of a document as part of a database change notification? This would circumvent the need to load each changed document to see if it's of a type I might be interested in. (I had started implementing this as part of a new feature, but the functionality was moved to the server and synced to the device via a document)

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