DDL And The Optimizer

Grant Fritchey notes that data definition language (DDL) queries do not appear to go through the query optimizer:

We can check whether or not you’re going to get an execution plan for this in two easy ways. You can capture the estimated plan, or run the query and capture the actual plan. Since most of the time, it’s preferable to work with the added runtime information that an actual plan provides, let’s start there. However, if you execute the query above and try to capture an actual plan, you will not get one. So, let’s capture the estimated plan instead. Here’s what we see:

Not much of a plan really.

Read on for that, and start holding your breath for a new execution plans book.

Related Posts

Recreating Dropped Azure SQL Managed Instance DBs

Jovan Popovic has a script to re-create an Azure SQL Managed Instance database which you might accidentally have dropped: Azure SQL Database – Managed Instance is fully-managed PaaS service that provides advanced disaster-recovery capabilities. Even if you accidentally drop the database or someone drops your database as part of security attack, Managed Instance will enable […]

Read More

Get Windows Failover Cluster Errors

John Morehouse walks us through the Get-ClusterLog cmdlet in Powershell: Sometimes you know that a problem occurred, but the tools are not giving you the right information.  If you ever look at the Cluster Failover Manager for a Windows Cluster, sometimes that can happen.  The user interface won’t show you any errors, but you KNOW […]

Read More

Categories

January 2017
MTWTFSS
« Dec Feb »
 1
2345678
9101112131415
16171819202122
23242526272829
3031