In the past few days, I am being contacted by clients for AlwaysOn related issue. I have been writing a blog about them. In this blog, we would learn about how to fix wait for HADR_AR_CRITICAL_SECTION_ENTRY.
SQL SERVER – Cluster Resource ‘AGName’ of type ‘SQL Server Availability Group’ in Clustered Role ‘AGName’ Failed
I never leave my customers alone when they are having an issue with something which I helped them. Typically, I help customers in creating POC and deploying AlwaysOn Availability Groups. Just the other day while doing the Comprehensive Database Performance Health Check, I came across error related to cluster resources.
SQL SERVER – Always On Availability Groups and Full-Text Index
One of the most successful offerings from me has been Comprehensive Database Performance Health Check. Sometimes during my assistance, some random issues appear which I try to solve as well. In a recent engagement, one of their developers asked a question about the coexistence of full-text index and always on availability groups. In this blog, we would learn about one common issue which you might face when full text and availability group is used together.
SQL SERVER – Unable to Create Always On Listener – Attempt to Locate a Writeable Domain Controller (in Domain Unspecified Domain) Failed
This is one of the common causes in Always On for which my clients contact me – “Unable to create listener”. In this blog we would learn about how to fix event Id 1212 – Attempt to locate a writeable domain controller.
SQL SERVER – Always On Secondary Replica Huge Redo Queue – Version Store is Full. New Version(s) Could Not be Added
One of my earlier clients to whom I helped in configuration Always On Availability Group came back to me with strange behavior. In this blog, we would discuss error Version store is full. New version(s) could not be added. In this situation, I also found that the redo queue was increasing continuously on the secondary replica.
SQL SERVER – Always On AG – HADRAG: Did not Find the Instance to Connect in SqlInstToNodeMap Key
During my On Demand (50 Minutes) consultancy, I solve the issue which seems quick to my client. SQL not starting, AlwaysOn not failing over, Cluster not working are few of quick things where my clients engage me. In this blog, I would share a situation where Always On Availability Group was not coming online due to error – Did not find the instance to connect in SqlInstToNodeMap key.
SQL SERVER – How to Fix log_reuse_wait_desc – AVAILABILITY_REPLICA?
Earlier this week I had multiple engagements of Comprehensive Database Performance Health Check. While working with one of the customers we realized that when we query sys.databases for one of the databases, we always see column log_reuse_wait_desc containing reasons AVAILABILITY_REPLICA. The customer was really curious about what it means. Let us see what we found out after quick research.