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Questions tagged [high-availability]

High availability is a software design approach and implementation that ensures a prearranged level of operational performance will be met during a contractual measurement period.

Attributes of high availability (HA):

  • Maximum uptime
  • Online maintenance - With little or no service interruption.
  • Simplicity - Complexity is an enemy of reliability, and encourages operator error, and so it is best avoided (e.g., Does a particular use-case really require the burden of implementing HA?).

Approaches that increase availability:

  • Fault-tolerance: Duplicate services waiting to take over should the primary fail or become unreachable.
    • Active/Active +Enables load-balancing -More complicated
    • Active/Passive +Simpler -Does not increase load capacity.
  • Replication:
    • Synchronous +Safer -Slow over longer distances.
    • Asynchronous +Faster -Possibility of data loss
      • The "A" in CAP Theorem.
  • Graceful degradation: Rate limiting and client throttling.
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Is pureScale and HADR available on DB2 Community edition?

Is pureScale and HADR available on the free DB2 Community edition?
LinuxMan1820
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Switching nodes in High Availability mode

I repeatedly switch data nodes in high availability mode, the terminal continues prompting that the transaction is occupied, and then resumes after a few minutes. Why does this occur?
Polly
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Wordpress: One Writer Node and a Few Reader Nodes Behind a Load Balancer. Can't Direct the Login to JUST the Writer Node

I am stuck between AWS and Wordpress. I've worked my way though a tutorial as an exercise, and I am pretty sure that the tutorial has some failed logic in it. If you have the time, here's the setup. It's supposed to work like this. You have an EC2…
Bassphil
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Can a database be added to an HA group online?

Edited I created a new database on my HA server and I need to add it the to availability group. It's a new database and doesn't have anything in it. The HA group contains multiple critical databases running in it. Can I add the new database to the…
Bruno
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SQL Server :: Replication Distribution Agent never ending

I'm running SQL Server 2019 Always ON Availability Group with an asynchronous replication. I use a free tool called IDERA SQL Check and I have spotted the SPID 69 which program name is Replication Distribution Agent. It's always there, staring at me…
Francesco Mantovani
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Running Highly available Database on kubernetes pods (with automatic configuration)

I want to run a highly available database on kubernetes pods. I am able to run mongodb but after the deployment is finished, we need to run some manual steps to scale out mongodb and I am not able to find any way to automate that. Is there a way to…
Ankush Jindal
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Problems with clustered Mongodb 4.x multi-document transactions

I have a problem with MongoDB cluster when it comes to use multi-document transactions. I have a 5 mongodb replicaset servers divided into three data centers. Two of them are in the first datacenter, two in the second, and one in the third…
devstructor
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Hadoop Oozie CPU utilization high

I'm currently running 20 concurrent jobs in OOZIE and noticed that oozie is hitting 400% of CPU utilization in the VM. How to reduce the load? Will adding another oozie server reduce the load on it?
Sam89
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Design a high available API service with database backend on AWS

I am working on an API layer which serves requests from a backend database. So the requirements are: Repopulate the whole table without downtime for API service: A main requirement for the API is that we should be able to re-populate the…
user2715182
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Nexus Repository Manager OSS - High Availability - Clustering (HA-C) or Disaster Recovery

I have found found that, High Availability Clustering (HA-C) is a feature available in Nexus Repository Manager Pro (NXRM Pro) https://help.sonatype.com/display/NXRM3/High+Availability+-+Introduction I am using Nexus Repository Manager OSS 3.6.2-01…
Nitul
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High availability solution for NodeJS, Nginx and MongoDB

I need opinion and best practice from someone more experienced in configuring nginx+nodejs+mongodb. I'm working on custom build cloud application based on MongoDB and NodeJS. As reverse proxy server I'm using nginx, and for manage NodeJS I'm using…
lobuljen
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Neo4j - Difference between High Availability and Distributed Mechanism?

Neo4j explain about the clustering through a concept called High Availability. And, What I know about clustering with hadoop knowledge is distributed computing. What are the difference between these two concepts? Thanks
Jack Daniel
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How can i speed this query linq please?

I want to make the LINQ query in this method faster: public string GeneraCodiceListaEventi(DateTime data) { string codice = String.Empty; string[] range1 = new string[] { "08:00", "08:30", "09:00", "09:30", "10:00", "10:30", "11:00",…
Markus Werner
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Can you use a windows server in combination with a WPF application

I am going to make a GUI with WPF because then I can use MahApps.Metro, which makes my application pretty. This application will be installed on computers and should be available 24/7.So I thought using a windows server would be a good idea. But…
user3599415
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Learning material for Websphere MQ Clusters

What are some good books for learning about Websphere MQ clusters? Material on messaging systems in general was easy to come by, but I can't find anything useful on the net to understand the fundamentals of MQ clustering. To top that, since IBM…
alokraop
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