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Symptoms

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:

  1. Restoring to a disk with 4K sector size.

  2. 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).

  3. Restoring to a 512 sector size disk with Trace Flag (TF) 1800 enabled.

Resolution

This issue is fixed in the following cumulative updates for SQL Server:

       Cumulative update 9 for SQL Server 2016 SP1

       Cumulative Update 1 for SQL Server 2016 SP2

       Cumulative Update 7 for SQL Server 2017

       Cumulative Update 12 for SQL Server 2014 SP2

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:

Latest cumulative update for SQL Server 2017

Latest cumulative update for SQL Server 2016

Latest cumulative update for SQL Server 2014

Service Pack information for SQL Server:

This issue is fixed in the following service pack for SQL Server:

       Service Pack 3 for SQL Server 2014

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.

How to determine the version, edition and update level of SQL Server and its components

 

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminologythat Microsoft uses to describe software updates.

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