Upgrades And Regressions

Kendra Little explains when upgrades can cause performance to suffer:

The cluster’s servers and SQL Server configurations were built to be as close to identical as possible to the previous instance (memory, cores, disk, maxdop, CTP, etc).

After the migration, I noticed that CPU utilization jumped from the normal 25% to a consistent 75%.

I did several other migrations with similar server loads with no issues, so I’m a bit puzzled as to what might be going on here. Could the upgrade from SQL Server 2008 R2 to SQL Server 2012 simply be exposing bad queries that 2008 was handling differently?

Kendra goes through a number of reasons, building a troubleshooting guide in the process.  This is a great read.

Related Posts

More dbatools Changes

Chrissy LeMaire has a few more breaking changes for us: It’s been a busy couple days! Here’s a list of our breaking changes Invoke-Sqlcmd2 has been removed and replaced with a warning to use Invoke-DbaQuery The NetworkShare parameter has been renamed to SharedPath UseLastBackups has been renamed to UseLastBackup There are also several new commands […]

Read More

Migrating A Database To Managed Instances

Frank Gill shows how to migrate a database from on-premises to an Azure SQL Managed Instance: If you have run through my last Managed Instance blog post, you have a Managed Instance at your disposal.  The PowerShell script for creating the network requirements also contains steps to create an Azure VM in a different subnet in […]

Read More

Categories

July 2016
MTWTFSS
« Jun Aug »
 123
45678910
11121314151617
18192021222324
25262728293031