當發生容錯移轉時,由於原本的readonly secondary replicas變成primary replicas,將導致寫入失敗.
所以只有兩台的時候，最好不要設定secondary為read-only來做load balance的動作，因為這樣有點等同於放棄了HA.
如果要HA又LoadBanlance,至少要有三台.
並且
唯讀採用ASYNC
備援採用SYNC
參考來源:
Offload workload to secondary availability group replica - SQL Server Always On
Applies to: SQL Server (all supported versions) The Always On availability groups active secondary capabilities include…docs.microsoft.comDatabase is read-only error in Secondary Replica of Alwayson Groups
I tried many things and analyzed lots of documents but I haven't found a solution yet. I have three virtual machines in…stackoverflow.comSQL Server AlwaysON从入门到进阶（1）--何为AlwaysON？_MVP黄钊吉（發糞塗牆）-CSDN博客
本文为第一节。即SQL Server AlwaysON从入门到进阶（1）--何为AlwaysON？…blog.csdn.netActive Secondaries: Backup on Secondary Replicas (AlwaysOn Availability Groups)
Its been a old story now , when we use to take database backup on the Primary Database as we don't have another option…sqlcontent.com五餅二魚工作室
SQL Server 的 AlwaysON 不僅可以做到 HA/DR，也可以讓 Secondary Replica 支援資料讀取，讓系統發揮更大的效能。 之前有關 AlwaysON…dotblogs.com.twAlwaysOn 可用性群組
微軟的 SQL Server 提供以下四種做法來達到 High Availability (HA) 功能。 複寫（Replication） 複寫機制是透過 SQL Agent…vito-note.blogspot.comOffload workload to secondary availability group replica - SQL Server Always On
Applies to: SQL Server (all supported versions) The Always On availability groups active secondary capabilities include…docs.microsoft.com[SQL SERVER - How To Improve Performance by Offloading Backups to a Secondary Replica - Notes from…
Notes from Pinal]: If we get one server, we want two servers, and if we get two servers, we want four servers. If we…blog.sqlauthority.com](https://blog.sqlauthority.com/2015/12/24/sql-server-how-to-improve-performance-by-offloading-backups-to-a-secondary-replica-notes-from-the-field-108/ "https://blog.sqlauthority.com/2015/12/24/sql-server-how-to-improve-performance-by-offloading-backups-to-a-secondary-replica-notes-from-the-field-108/")AlwaysON AG Readable Secondary is set to 'Yes'. How to connect from the client?
If you want to access a secondary replica in an Always On configuration, the Readable Secondary property must be set to…dba.stackexchange.comhttps://dba.stackexchange.com/questions/176037/always-on-read-intent
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