Introduction

Have you ever made changes to stored procedures on your primary SQL Server Availability Group (AG) replica, only to realize those changes didn’t automatically propagate to the secondary replicas? It’s a common issue that can lead to inconsistencies and confusion. In this article, I’ll share the best way I’ve found to easily synchronize stored proc changes across all your AG replicas, keeping them in sync and making your life as a DBA a whole lot easier!

The Challenge with Stored Proc Changes in AGs

Here’s the core problem: when you create or alter a stored procedure on the primary replica of a SQL Server Availability Group, those changes are not automatically propagated to the secondary replicas. The proc changes are considered “non-data” changes and therefore aren’t shipped across to the secondaries by the AG replication.

This can lead to issues where your secondary replicas have outdated versions of stored procedures, causing inconsistent behavior or even failures after a failover. Not good!

The Solution: A Handy Synchronization Script

Luckily, there’s a straightforward solution. By leveraging a clever synchronization script, we can easily identify stored proc changes on the primary and automatically apply them to all secondary replicas. Here’s how it works:

1. The script queries the primary replica’s sys.procedures catalog view to get the latest create_date or modify_date for each stored proc
2. It compares those dates to what’s on the secondary replicas to identify procs that need updating
3. For procs that are new or changed on the primary, the script generates a dynamic SQL command to drop and recreate the proc
4. The drop/create commands are executed on each secondary replica to bring them in sync

I like to schedule this synchronization script to run periodically, such as every night. That way, I know my secondary replicas are always up-to-date with the latest proc changes from the primary. No more worries about inconsistencies or outdated code!

Here’s a simplified version of the key portion of the script:

DECLARE @sql NVARCHAR(MAX) = '';

SELECT @sql += 
  'IF EXISTS (SELECT * FROM sys.procedures 
    WHERE name = ''' + name + ''') 
  DROP PROCEDURE ' + QUOTENAME(SCHEMA_NAME(schema_id)) + '.' + QUOTENAME(name) + ';' + CHAR(13) + 
  definition + ';' + CHAR(13)
FROM sys.procedures;

EXEC sp_executesql @sql;

Handling Special Cases

There are a few special situations to keep in mind with this synchronization approach:

• Be aware of procs with dependencies on other objects like tables or views. You may need to update those dependencies on the secondaries as well.
• Watch out for procs that access server-specific things, like linked servers or file paths. You’ll need to adjust those to work across all replicas.
• Procs with EXECUTE AS clauses may require additional permissions to be dropped/recreated. Grant the necessary permissions in the script.

Conclusion

By using an automated script to synchronize stored procedure changes from your primary to all secondary replicas, you can eliminate inconsistencies and keep your SQL Server Availability Group humming along smoothly. I’ve found this approach to be a huge time-saver and highly recommend it. Give it a try in your environment and let me know how it goes!

Remember, staying on top of stored proc changes across replicas is key to a healthy AG environment. With this handy script in your toolkit, it’s easier than ever. Happy synchronizing!