Tag Archives: High Availability

Always On: Troubleshooting Consolidated

Working on Always On and configuration/setup of AG we have observed many errors. especially when configuration listener with following error 19471 or AG could not configure: Creating availability group listener resulted in an error. ADDITIONAL INFORMATION: Create failed for Availability … Continue reading

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Configure Kubernetes with minikube

We have discussed about Docker Swarm to know how to use Docker as a Load balance. Today we will discuss about Kubernetes – Wiki: “Kubernetes is an open-source container orchestration system for automating application deployment, scaling, and management. It was originally … Continue reading

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Day 21 NDB Storage Engine (Cluster)

MySQL also support High Availability, NDB Storage engine provides high availability- shared-nothing system, NDB Cluster integrates the standard MySQL server with an in-memory clustered storage engine called NDB (which stands for “Network DataBase” NDB Cluster required 3 Nodes required complete the setup: Management node(mgmd): … Continue reading

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HA between Windows and Linux

If you ask before couple of years about Microsoft and Linux can be compatible was a dream. now Microsoft has made SQL Server to work on Linux we have accepted that. It has some Middle OS to interact with Linux … Continue reading

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vNext has AG

Now vNext SQL Server on Linux supports Availability Group HA/DR functionality supported.   https://blogs.technet.microsoft.com/dataplatforminsider/2017/02/17/sql-server-on-linux-mission-critical-hadr-with-always-on-availability-groups/    

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Distributed AG

going though Allan Hirt’s 24 SQLPASS  recording, he has explained the new feature of SQL Server Availability group you can get it here. http://www.sqlpass.org/24hours/2016/summitpreview/Sessions.aspx he is expert in Clustering /AG/ and published several blogs and books. Distributed AG is advance and extended … Continue reading

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Sql Cluster Resource not comming online

when you check on the sql server services and sql agent services it’s getting started on windows cluster but on cluster its going down again. on error log you may get the cluster service Login failed for user ‘cluster service … Continue reading

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Denali – Day 2: AlwaysON High Availability (aka Project HADRON)

Denali – Day 2: AlwaysON High Availability (aka Project HADRON ) AlwaysON Availability Group: is another very important achievement done by development team project called “HADRON”. As the name implies AlwaysON is a High availability feature on Failure Clustering where it has … Continue reading

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High Availability 9’s

This is very important to understand what is high availability 9’s, This is a measurement of high availability  where you can tell how much downtime is feasible for your organization for a Year(annually). the calculation is as follows =Total Hours in a … Continue reading

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Dynamic Add/Remove file in Mirroring/Logshipping

Yesterday we were having discussion on high availability feature Mirroring and Log shipping with my colleagues (Amol & Alankar) on whether can we dynamically add/drop any new file in our principle or primary database, got conclusion that YES it is … Continue reading

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