KB4578579 - Improvement: Availability Group listener without the load balancer in SQL Server 2016, 2017 and 2019 - Microsoft Support.

Symptoms. Assume that you have an Always On Availability Group (AG) that contains many databases in Microsoft SQL Server 2016. Then, you set the Availability Group to use synchronous commit availability mode together with automatic failover mode.

Symptoms. Assume that you have configured AlwaysOn Availability Group by using Pacemaker for SQL Server 2017 or 2019 on Linux. While connecting to SQL Server, you notice that intermittent Availability Group failover occurs as AG helper connection times out.

Symptoms. Assume that you have an Always On Availability Group (AG) in SQL Server 2016 and 2017. When you process a read query on a secondary replica, the performance might be much slower than the primary replica due to frequent DIRTY_PAGE_TABLE_LOCK waits.

KB3009974 - FIX: Slow synchronization when disks have different sector sizes for primary and secondary replica log files in SQL Server AG and Logshipping environments - Microsoft Support.

Symptoms. Assume that you create an Always On Availability Group (AG) with automatic seeding in Microsoft SQL Server 2016. When you try to change the SEEDING_MODE to MANUAL by using ALTER AVAILABILITY GROUP on the primary replica, then you notice that SQL Server does not cancel current seeding operations to the secondary replica.

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假设你在 Microsoft SQL Server 2014 或2016中使用 Alwayson 可用性组（AG）。. 当 AG 处于离线状态时，如果 SQL Server 数据库位于 AG 中，则即使在 AG 再次联机时，数据库全文搜索自动爬网也会停止并且从不启动。. 您可能需要通过运行以下查询手动恢复自动爬网：. "在 Table_1 ...