In my last post on monitoring Availability Groups I covered looking at Perfmon Counters now we take a look at getting alerts from SQL Agent. When it comes to checking on your Availability Groups one of the easiest ways to keep track at a high level of the health of the them is to setup SQL Agent alerts.  I’m going to go out on a limb here an assume if you are using SQL Agent alerts you have severity alerts 19 through 25 along with a few extras like error numbers 823 and 825 setup if not check out this post at SQLskills.  I personally have 16 through 18 turned on as well going to email only, no paging.

For Availability Groups we have a few extra error numbers we care about. Error number 1480 tells when a server changes roles, so we can know when a server flips from a secondary to a primary, or from a primary to a secondary. Error number 35264 tells when data movement has suspended on any database. This can occur for many reasons. One I have seen is when you have expanded your mount point on your primary and the data or log file runs out of space on the secondary the data or log file can not expand on the secondary because you forgot to expand the secondary. Error number 35265 tells you when the data movement has resumed on any database.  Error number 41404 let’s you know if your AG is offline which can be bad if you expected an automatic failover.  Error number 41405 let’s you know if an Availability Group can’t automatically failover for any reason.  In the later to cases you will want to look at your SQL Error logs and AlwaysOn Extended Events Health session.

Series Navigation<< Monitoring Availability Groups Part 1 – Perfmon CountersMonitoring Availability Groups Part 3 – Extended Events >>
Tracy Boggiano
Follow me

Tracy Boggiano

Database Superhero at ChannelAdvisor
Tracy has spent over 20 years in IT and has been using SQL Server since 1999 and is currently certified as a MCSE Data Management and Analytics. She has worked on SQL Server 6.5 and up including currently SQL 2017 RC1. She enjoys monitoring, performance tuning, and high availability and disaster recovery technologies. Tracy is currently a co-organizar the for special interest group for Advanced DBA Topics for the TriPASS user group.

She also tinkered with databases in middle school to keep her sports card collection organized.

Tracy has volunteered through the NC Guardian ad Litem program since 2003 advocating for abused and neglected foster children in court.This is her passion outside of SQL Server and favorite job.More information about this program in North Carolina can be found at http://volunteerforgal.org or the national organization CASA at http://www.casaforchildren.org.
Tracy Boggiano
Follow me