Running scripts on primary and secondary instances.

Question

Hello,
I created an AlwaysOn Availability group with 4 instances and I added 1 database to the availability group. On every instance the database is readable.
When I run sp_updatestats, on one of the secondary instances, I get this error message.
Msg 15635, Level 16, State 1, Procedure sp_updatestats, Line 21
Cannot execute 'sp_updatestats' because the database is in read-only access mode.
When I run
SELECT
name,
is_read_only FROM
sys.databases
where name
= 'mydb' I get
Name        
is_read_only
mydb  
       0
That probably makes sense because I am looking at a copy of the database on the primary instance and the database on the primary instance
is not read only? Or am I looking at a bug? Should the availability group change is_read_only to 1 on the secondary instances?
Is it possible to detect that a database is synchronizing or is read only and that you should not update statistics or rebuild indexes?
It has to be dynamic. I do not want to have to exclude and include database when the primary instance changes.
Something like
If (database is on primary availability group instance == true)
Exec task
Else
Forget about it
Greetings,
Erik

Answer 1

Hi hcv,
Each availability group defines a set of two or more failover partners known as availability replicas.
Every availability replica is assigned an initial role—either the primary role or the secondary role. The role of a given replica determines whether it hosts read-write databases or read-only databases. One replica, known as the primary replica, is assigned
the primary role and hosts read-write databases, which are known as primary databases. At least one other replica, known as a secondary replica, is assigned the secondary role. A secondary replica hosts read-only databases, known as secondary databases. So
once a database is set to READ ONLY, Statistics will not be automatically updated
 and we will not be able to create indexes and so on. If you change the original secondary replica resolves to the primary role, its databases become the primary databases, then you can execute sp_updatestats on the read-write databases.
For more information, see:
Overview of AlwaysOn Availability Groups (SQL Server)
Regards,
Sofiya Li
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