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Questions tagged [nosql]

60 questions
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How to get the MongoDB' current working set size

From the doc , it said "For best performance, the majority of your active set should fit in RAM." So for example, my db.stats() give me { "db" : "mydb", "collections" : 16, "objects" : 21452, "avgObjSize" : 768.0516501957859, "dataSize" :…
Howard
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What's the lowest cost, legal, Microsoft server stack you can assemble?

Assuming that you have an app infrastructure that generally only requires: ASP.NET MVC / C# / .NET Database or NoSQL data store (must be accessible from C#) Here's the challenge to you server gods: What is the least expensive configuration that…
McKAMEY
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OlegDB in production

When evaluating available NoSQL solutions, our team identified following product for evaluation: OlegDB. Site looks pretty decent and documentation is available. While site says it's production-ready (here), I'd like to know community opinion before…
Lev Kassil
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What does it mean when Twitter says their entire database is in RAM?

I am wondering where to begin with database scaling/optimization strategies. After reading articles like highscalability.com's facebook architecture article, and this twitter architecture article, I am not sure if by RAM they mean only memcached,…
Lance
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5 answers

What does it mean when Twitter says their entire database is in RAM?

I am wondering where to begin with database scaling/optimization strategies. After reading articles like highscalability.com's facebook architecture article, and this twitter architecture article, I am not sure if by RAM they mean only memcached,…
Lance
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6 answers

How to achieve zero down time

For an application we want to achieve zero database and application down time using Active Active configuration. Our dB is Oracle Following are my questions: How can we achieve active active configuration in Oracle? Will introducing…
Hiral Lakdavala
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2 answers

Nosql autoscaling of compute

Most of the nosql autoscaling faces issue due to the fact the data have to be migrated during peak load. What if data is stored in a shared storage like CLVM which has less overhead(compared to NFS or shared file system). Now if each bucket/shard is…
kalyan
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Enabling WiredTiger engine in MongoDB 3

I've problem with enabling WiredTiger engine by setings in mongod.conf I'm using Centos 7, and this is my config #/etc/mongod.conf storage: wiredTiger: engineConfig: cacheSizeGB: 2 collectionConfig: …
B14D3
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"Cannot bind to port" enabling Cassandra client encryption

I'm running Cassandra 1.2 with a three-node cluster, on Debian 7. The cluster is working fine. But I want to enable encryption for clients, as documented here:…
danslimmon
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RDBMS: Is it possible to scale out a RDB?

Is it possible to scale out a RDB ? If it's possible, how can one achieve it? I'm asking this question because I assisted to a NoSQL event in which the speaker told many times that the one of the disadvantages of relational databases is the…
Michael
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What are the options for establishing a VLAN to support database sharding and replication?

Background: I'm writing a web application that will be available to the world at large on a software-as-a-service basis. As input to my choosing a database platform, I've been reading up on 'NoSQL' databases like Cassandra, Riak, MongoDB, and Redis.…
David Pinn
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Suggestions for spatial database systems

I'm looking for suggestions on a database for large sets of spatial master data. The data itself is not relational, but could be formulated as such. The data as-is is structed as: latitude, longitude, time-series ("array" of ints) Currently, we…
Catamount
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strange raw device perfromance on Aerospike ASD 3.15.1.4

I have a cluster of 4 servers. One of the namespaces is raw device based. The devices reside on a SAS mechanical hard drive. Now here is the weird part of the story. I am running one of the tests with small records (2x50 bytes = 100 bytes total). I…
Boris Epstein
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Mongodb Slave replication lag

We using standard mongo setup: 2 replicas + 1 arbiter. Both replica servers use same AWS m1.medium with RAID10 EBS. We experiencing constantly growing replication lag on secondary replica. I tried to do full-resync, you can see it on graph, but it…
Leonid Bugaev
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non-mapped virtual memory & total number of connections

We have two MongoDB data nodes (replica set) - Primary & Secondary. I noticed that the non-mapped virtual memory is relatively high and wondering if they are hurting our MongoDB performance (The server usually peaked at around 6-7K queries per sec).…
tszming
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