Category Archives: Disaster Recovery

AG without WSFC SQL 2017 and more…

Starting Sql Server 2017 Microsoft can allow you to enable the configuration manager for “Always ON” feature for standalone system without WSFC and linux without Pacemaker . it has a limitation as : It cannot have listener configuration This would … Continue reading

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Read-only URL removal

When I blog to configure Read only replica. it would require to provide read-only URL information, and provide the replica sequence. but their is no easy way to remove the Read-only URL. we have to remove the AG group to … Continue reading

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Read-only Replica -AG

Read only replica is a great concept where we can re-direct all the read only connections to that replica.   Following are some of the great articles for it. How to Configure Read-Only Routing for an Availability Group in SQL … Continue reading

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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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MongoDB Replica-Set

The most important feature of MongoDB is its easy setup and use of Replica set. in mongo db you can easily setup it here is the link for it which I am used by Soham Kamani Create a network: Docker … Continue reading

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Day 24 Replication Setup

Today we will discuss how setup a replication: Master – Slave Replication: Requirement: 2 (Linux) System (MasterServer and SlaveServer) MySQL Installed Connection to both servers are accessible. On Master Server: Edit my.cnf with following information: [mysqld] Log-Bin =MySQL_Binlog Server_ID=1 Create … 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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Day 17 Backup and Recovery

There are there types of Backup: Full Backup Incremental Backup Bin-Log Backup Full Backup: is a complete backup of the database You can use following some of the options in the MySQLDump command –all-databases             Dump all tables in all … 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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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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