A full-text index can block the redo thread of a readable Always On secondary. This post shows the three clues to read in sys.dm_exec_requests, how to find the internal table and how to check change tracking. It ends with the fix: manual tracking and a scheduled population.
SQL SERVER – Always On AG – HADRAG: Did not Find the Instance to Connect in SqlInstToNodeMap Key
After unexpected failovers, an availability group would not come online: Did not find the instance to connect in SqlInstToNodeMap key. This is how we solved it.
SQL SERVER – Microsoft Azure – Unable to Find Higher Tier Series Virtual Machine to Upgrade
My client wanted to upsize an Azure VM running Always On from D-Series to a higher tier G-Series size, but it was missing from the list. Here is what I suggested.
SQL SERVER – Database Mirroring Login Attempt Failed With Error: ‘Connection Handshake Failed. An OS Call Failed: (80090350)
Connection handshake failed with 0x80090350 on an availability group replica. What the code means, why it says mirroring, and what to check.
SQL SERVER – Error 9002: The Transaction Log for Database ‘SQLDB’ is Full Due to ‘DATABASE_MIRRORING’
Error 9002 has many causes. Here I explain the one where the transaction log for database ‘SQLDB’ is full due to ‘DATABASE_MIRRORING’ and what it tells you.
SQL SERVER – Slow SQL Server 2016 Installation in Cluster: RunRemoteDiscoveryAction
A client’s SQL Server 2016 Installation in Cluster hung at RunRemoteDiscoveryAction while setup ran discovery on the other node. Here is the cause of the delay.
SQL SERVER – Parallel Redo on AlwaysOn Secondary – DIRTY_PAGE_TABLE_LOCK
Redo lag and high DIRTY_PAGE_TABLE_LOCK waits hit a client’s AlwaysOn secondary. Here is how Parallel Redo in SQL Server 2016 causes them and what to do.