Assume that you are using Microsoft SQL Server. You may see slow performance when restoring a compressed backup of an SQL Server database in any of the following scenarios:
Restoring to a disk with 4K sector size.
Restoring to a SQL Server hosted on an Azure Infrastructure-as-a-Service Virtual Machines (IaaS VM) (Azure IaaS VM disks will have a 4K sector size).
Restoring to a 512 sector size disk with Trace Flag (TF) 1800 enabled.
This issue is fixed in the following cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Service Pack information for SQL Server:
This issue is fixed in the following service pack for SQL Server:
Service packs are cumulative. Each new service pack contains all the fixes that are in previous service packs, together with any new fixes. Our recommendation is to apply the latest service pack and the latest cumulative update for that service pack. You do not have to install a previous service pack before you install the latest service pack. Use Table 1 in the following article for finding more information about the latest service pack and latest cumulative update.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Learn about the terminologythat Microsoft uses to describe software updates.