Merge branch 'master' of

MikeRayMSFT · MikeRayMSFT · commit e20327d31e09 · 2020-05-28T20:34:20.000-07:00
diff --git a/docs/database-engine/configure-windows/adr-cleaner-retry-timeout-configuration-option.md b/docs/database-engine/configure-windows/adr-cleaner-retry-timeout-configuration-option.md
@@ -0,0 +1,46 @@
+---
+title: " ADR cleaner retry timeout (min) configuration option | Microsoft Docs"
+description: "Explains the SQL Server instance configuration setting for ADR cleaner retry timeout."
+ms.custom: ""
+ms.date: "06/01/2020"
+ms.prod: sql
+ms.reviewer: ""
+ms.technology: configuration
+ms.topic: conceptual
+helpviewer_keywords: 
+  - "ADR cleaner retry timeout (min)"
+author: MikeRayMSFT
+ms.author: mikeray
+---
+# ADR cleaner retry timeout (min) configuration option
+
+[!INCLUDE[appliesto-ss-xxxx-xxxx-xxx-md](../../includes/appliesto-ss-xxxx-xxxx-xxx-md.md)]
+
+Introduced in SQL Server 2019.
+
+This configuration setting is required for [accelerated database recovery](../../relational-databases/accelerated-database-recovery-concepts.md). The cleaner is the asynchronous process that wakes up periodically and cleans page versions that are not needed.
+
+Occasionally the cleaner runs into issues while acquiring object level locks due to conflicts with user workload during its sweep. It tracks such pages in a separate list. The ADR cleaner retry timeout (default value of 15) controls the amount of time the cleaner would spend exclusively retrying object lock acquisition and cleanup of page before abandoning the sweep. Completion of a sweep with 100% success is essential to keep the growth of aborted transactions in the aborted transactions map. If the separate list cannot be cleaned up in the prescribed timeout, then the current sweep will be abandoned and the next sweep will start.
+
+## Remarks  
+
+The cleaner is single threaded in SQL Server 2019 and so one SQL Server instance can work on one database at a time. If the instance has more than one user database with ADR enabled, then do not increase the timeout to a large value as that could delay cleanup on one database while the retry is happening on another database.
+
+## Examples
+
+The following examples sets the cleaner retry timeout.
+
+```tsql
+sp_configure 'show advanced options', 1;  
+RECONFIGURE;
+GO 
+sp_configure 'ADR cleaner retry timeout', 15;  
+RECONFIGURE;  
+GO  
+```  
+
+## See Also  
+
+- [Server Configuration Options &#40;SQL Server&#41;](../../database-engine/configure-windows/server-configuration-options-sql-server.md)
+- [Accelerated database recovery](../../relational-databases/accelerated-database-recovery-concepts.md)
+- [Manage accelerated database recovery](../../relational-databases/accelerated-database-recovery-management.md)
diff --git a/docs/database-engine/configure-windows/adr-preallocation-factor-server-configuration-option.md b/docs/database-engine/configure-windows/adr-preallocation-factor-server-configuration-option.md
@@ -0,0 +1,55 @@
+---
+title: "ADR Preallocation Factor configuration option | Microsoft Docs"
+description: "Explains the SQL Server instance configuration setting for ADR Preallocation Factor."
+ms.custom: ""
+ms.date: "06/01/2020"
+ms.prod: sql
+ms.reviewer: ""
+ms.technology: configuration
+ms.topic: conceptual
+helpviewer_keywords: 
+  - "ADR Preallocation Factor"
+author: MikeRayMSFT
+ms.author: mikeray
+---
+# ADR Preallocation Factor configuration option
+
+[!INCLUDE[appliesto-ss-xxxx-xxxx-xxx-md](../../includes/appliesto-ss-xxxx-xxxx-xxx-md.md)]
+
+Introduced in SQL Server 2019.
+
+This configuration setting is required for [accelerated database recovery](../../relational-databases/accelerated-database-recovery-concepts.md).
+
+Accelerated Database Recovery (ADR) maintains versions of data for recovery purposes. These versions are generated as part of various data manipulation language (DML) operations. Versions are stored in an internal table called persistent version store (PVS). 
+
+## Remarks  
+
+Performance can degrade if pages are allocated for the PVS table as part of foreground user DML operations. To address this, there is a background thread which pre-allocates pages and keeps them readily available for DML transactions. Performance is best when the background thread preallocates enough pages and the percentage of foreground PVS allocations is close to 0. The error log contains entires with the tag `PreallocatePVS` if the percentage goes high and is affecting performance.
+
+The number of pages the background thread pre-allocates is based on various workload heuristics, but largely allocates pages in chunks of 512 pages. The ADR preallocation factor is a multiple of the chunk. By default, the factor is 4. This means it preallocates 2048 pages at once when required. 
+
+While the background thread takes workload patterns into consideration, this factor can be increased if necessary to improve performance.
+
+> [!CAUTION]
+> If PVS preallocation is increased too much, it will contend with other allocations in the system and might actually reduce overall performance
+>
+> Before you modify this setting, test the overall performance of the system.
+
+## Examples  
+
+The following example sets the preallocation factor to 4.
+
+```tsql
+sp_configure 'show advanced options', 1;
+RECONFIGURE;
+GO 
+sp_configure 'ADR Preallocation Factor', 4;
+RECONFIGURE;
+GO
+```
+
+## See Also  
+
+- [Server Configuration Options &#40;SQL Server&#41;](../../database-engine/configure-windows/server-configuration-options-sql-server.md)
+- [Accelerated database recovery](../../relational-databases/accelerated-database-recovery-concepts.md)
+- [Manage accelerated database recovery](../../relational-databases/accelerated-database-recovery-management.md)
diff --git a/docs/database-engine/configure-windows/server-configuration-options-sql-server.md b/docs/database-engine/configure-windows/server-configuration-options-sql-server.md
@@ -68,6 +68,8 @@ Self-configuring options are those that [!INCLUDE[ssNoVersion](../../includes/ss
     |[access check cache bucket count](../../database-engine/configure-windows/access-check-cache-server-configuration-options.md) (A)|0|16384|0|  
     |[access check cache quota](../../database-engine/configure-windows/access-check-cache-server-configuration-options.md) (A)|0|2147483647|0|  
     |[ad hoc distributed queries](../../database-engine/configure-windows/ad-hoc-distributed-queries-server-configuration-option.md) (A)|0|1|0|  
+    |[ADR cleaner retry timeout (min)](../../database-engine/configure-windows/adr-cleaner-retry-timeout-configuration-option.md)<br><br> Introduced in SQL Server 2019|0|32767|15|  
+    |[ADR Preallocation Factor](../../database-engine/configure-windows/adr-preallocation-factor-server-configuration-option.md)<br><br> Introduced in SQL Server 2019|0|32767|4|  
     |[affinity I/O mask](../../database-engine/configure-windows/affinity-input-output-mask-server-configuration-option.md) (A, RR)|-2147483648|2147483647|0|  
     |[affinity64 I/O mask](../../database-engine/configure-windows/affinity64-input-output-mask-server-configuration-option.md) (A, only available on 64-bit version of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)])|-2147483648|2147483647|0|  
     |[affinity mask](../../database-engine/configure-windows/affinity-mask-server-configuration-option.md) (A)|-2147483648|2147483647|0|  
@@ -118,6 +120,7 @@ Self-configuring options are those that [!INCLUDE[ssNoVersion](../../includes/ss
     |[open objects](../../database-engine/configure-windows/open-objects-server-configuration-option.md) (A, RR, obsolete)|0|2147483647|0|  
     |[optimize for ad hoc workloads](../../database-engine/configure-windows/optimize-for-ad-hoc-workloads-server-configuration-option.md) (A)|0|1|0|  
     |[PH_timeout](../../database-engine/configure-windows/ph-timeout-server-configuration-option.md) (A)|1|3600|60|  
+    |[polybase network encryption](../../relational-databases/polybase/polybase-installation.md#enable) | 0|1 |1
     |[polybase enabled](../../relational-databases/polybase/polybase-installation.md#enable) (RR) **Applies to**: [!INCLUDE[sssqlv15](../../includes/sssqlv15-md.md)])|0|1|0|
     |[precompute rank](../../database-engine/configure-windows/precompute-rank-server-configuration-option.md) (A)|0|1|0|  
     |[priority boost](../../database-engine/configure-windows/configure-the-priority-boost-server-configuration-option.md) (A, RR)|0|1|0|  
diff --git a/docs/relational-databases/accelerated-database-recovery-concepts.md b/docs/relational-databases/accelerated-database-recovery-concepts.md
@@ -1,6 +1,6 @@
 ---
 title: "Accelerated database recovery | Microsoft Docs"
-ms.date: "08/12/2019"
+ms.date: "05/20/2020"
 ms.prod: sql
 ms.prod_service: backup-restore
 ms.technology: backup-restore
@@ -129,7 +129,9 @@ The following types of customers should consider enabling ADR:
 - Customers that have seen cases where active transactions are causing the transaction log to grow significantly.  
 - Customers that have experienced long periods of database unavailability due to SQL Server long running recovery (such as unexpected SQL Server restart or manual transaction rollback).
 
+>[!IMPORTANT]
+>ADR is not supported for databases enrolled in database mirroring.
 
 ## See Also  
 
-  
+[Manage accelerated database recovery](accelerated-database-recovery-management.md)
diff --git a/docs/relational-databases/data-collection/configure-the-management-data-warehouse-sql-server-management-studio.md b/docs/relational-databases/data-collection/configure-the-management-data-warehouse-sql-server-management-studio.md
@@ -1,5 +1,6 @@
 ---
 title: "Configure the Management Data Warehouse (SSMS)"
+description: Learn how to configure the management data warehouse to support data storage on one or more instances of SQL Server that are using the data collector. 
 ms.custom: ""
 ms.date: "03/14/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/data-collection/data-collection.md b/docs/relational-databases/data-collection/data-collection.md
@@ -1,5 +1,6 @@
 ---
 title: "Data Collection | Microsoft Docs"
+description: Learn introductory information about the data collector, a component of SQL Server 2019 that collects different sets of data.
 ms.custom: ""
 ms.date: "07/18/2016"
 ms.prod: sql
diff --git a/docs/relational-databases/data-collection/management-data-warehouse.md b/docs/relational-databases/data-collection/management-data-warehouse.md
@@ -1,5 +1,6 @@
 ---
 title: "Management Data Warehouse | Microsoft Docs"
+description: The management data warehouse in SQL Server is a relational database that contains the data that is collected from a target server.
 ms.custom: ""
 ms.date: "03/14/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/data-collection/system-data-collection-set-reports.md b/docs/relational-databases/data-collection/system-data-collection-set-reports.md
@@ -1,5 +1,6 @@
 ---
 title: "System Data Collection Set Reports | Microsoft Docs"
+description: The data collector provides a report for each of the System Data collection sets for monitoring system capacity and system performance in SQL Server.
 ms.custom: ""
 ms.date: "03/14/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/database-engine-error-severities.md b/docs/relational-databases/errors-events/database-engine-error-severities.md
@@ -1,5 +1,6 @@
 ---
 title: "Database Engine Error Severities | Microsoft Docs"
+description: Use this list of severity levels to understand the type of problem that SQL Server encountered when the SQL Server Database Engine raises an error.
 ms.custom: ""
 ms.date: "03/16/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/database-engine-events-and-errors.md b/docs/relational-databases/errors-events/database-engine-events-and-errors.md
@@ -1,5 +1,6 @@
 ---
 title: "Database engine events and errors"
+description: Consult this MSSQL error code list to find explanations for error messages for SQL Server database engine events.
 ms.custom: ""
 ms.date: 01/28/2020
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/errors-and-events-reference-database-engine.md b/docs/relational-databases/errors-events/errors-and-events-reference-database-engine.md
@@ -1,5 +1,6 @@
 ---
 title: "Errors and Events Reference (Database Engine) | Microsoft Docs"
+description: Learn about selected SQL Server Database Engine error messages that need further explanation and use links to external resources.
 ms.custom: ""
 ms.date: "10/15/2019"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-10060-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-10060-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_10060 | Microsoft Docs"
+description: The SQL Server client cannot connect to the server. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-10061-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-10061-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_10061 | Microsoft Docs"
+description: The server did not respond to the client request in SQL Server. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-17132-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-17132-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_17132 | Microsoft Docs"
+description: The SQL Server computer was unable to process the client login packet. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-18456-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-18456-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_18456 | Microsoft Docs"
+description: A connection attempt is rejected due to a failure with a bad password or username in SQL Server. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "06/09/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-207-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-207-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_207 | Microsoft Docs"
+description: A query error in SQL Server regarding an invalid column name. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-208-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-208-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_208 | Microsoft Docs"
+description: The specified object cannot be found, giving rise to an invalid object name message. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-233-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-233-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_233 | Microsoft Docs"
+description: The SQL Server client cannot connect to the server. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-4104-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-4104-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_4104 | Microsoft Docs"
+description: The specified multi-part identifier could not be mapped to an existing entity. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-53-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-53-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_53 | Microsoft Docs"
+description: The SQL Server client cannot connect to the server. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/mssqlserver-916-database-engine-error.md b/docs/relational-databases/errors-events/mssqlserver-916-database-engine-error.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_916 | Microsoft Docs"
+description: The login does not have sufficient permissions to connect to the named SQL Server database. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/sql-server-native-client-error-mssqlserver-50000.md b/docs/relational-databases/errors-events/sql-server-native-client-error-mssqlserver-50000.md
@@ -1,5 +1,6 @@
 ---
 title: "MSSQLSERVER_50000 | Microsoft Docs"
+description: An error from an attempt was made to install or update SQL Server Native Client. See an explanation of the error and possible resolutions.
 ms.custom: ""
 ms.date: "04/04/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/errors-events/understanding-database-engine-errors.md b/docs/relational-databases/errors-events/understanding-database-engine-errors.md
@@ -1,5 +1,6 @@
 ---
 title: "Understanding Database Engine Errors | Microsoft Docs"
+description: Learn about the attributes of errors raised by the SQL Server Database Engine and how to access all system and user-defined error messages from sys.messages.
 ms.custom: ""
 ms.date: "03/16/2017"
 ms.prod: sql
diff --git a/docs/relational-databases/event-classes/audit-login-event-class.md b/docs/relational-databases/event-classes/audit-login-event-class.md
@@ -1,5 +1,6 @@
 ---
 title: "Audit Login Event Class | Microsoft Docs"
+description: The Audit Login event class indicates that a user has successfully logged in to Microsoft SQL Server.
 ms.custom: ""
 ms.date: "03/14/2017"
 ms.prod: sql
diff --git a/docs/sql-server/editions-and-components-of-sql-server-version-15.md b/docs/sql-server/editions-and-components-of-sql-server-version-15.md
@@ -157,7 +157,7 @@ The Developer edition continues to support only 1 client for [[!INCLUDE[ssNoVers
 |Resumable online index rebuilds|Yes|No|No|No|No|
 |Online schema change|Yes|No|No|No|No|
 |Fast recovery|Yes|No|No|No|No|
-|Accelerated database recovery|Yes|Yes|No|No|No|
+|Accelerated database recovery|Yes|Yes|Yes|No|No|
 |Mirrored backups|Yes|No|No|No|No|
 |Hot add memory and CPU|Yes|No|No|No|No|
 |Database recovery advisor|Yes|Yes|Yes|Yes|Yes|
@@ -414,11 +414,10 @@ For information about the Business Intelligence Client features supported by the
 |StreamInsight|StreamInsight Premium Edition|StreamInsight Standard Edition|StreamInsight Standard Edition|No|No|
 |StreamInsight HA|StreamInsight Premium Edition|No|No|No|No|
 
-[![Download SSMS](https://docs.microsoft.com/analysis-services/media/download.png)](../ssms/download-sql-server-management-studio-ssms.md) **[Download the latest version of [!INCLUDE[ssNoVersion](../includes/ssnoversion-md.md)] Management Studio](../ssms/download-sql-server-management-studio-ssms.md)**
-
 ## Next steps
 
 [Product Specifications for [!INCLUDE[ssNoVersion](../includes/ssnoversion-md.md)]](https://msdn.microsoft.com/library/6445fd53-6844-4170-a86b-7fe76a9f64cb)
+
 [Installation for [!INCLUDE[ssNoVersion](../includes/ssnoversion-md.md)]](../database-engine/install-windows/installation-for-sql-server-2016.md)
 
 [!INCLUDE[get-help-options](../includes/paragraph-content/get-help-options.md)]
diff --git a/docs/toc.yml b/docs/toc.yml
@@ -4398,6 +4398,10 @@
         href: database-engine/configure-windows/access-check-cache-server-configuration-options.md
       - name: ad hoc distributed queries
         href: database-engine/configure-windows/ad-hoc-distributed-queries-server-configuration-option.md
+      - name: ADR cleaner retry timeout
+        href: database-engine/configure-windows/adr-cleaner-retry-timeout-configuration-option.md
+      - name: ADR Preallocation Factor
+        href: database-engine/configure-windows/adr-preallocation-factor-server-configuration-option.md
       - name: affinity Input-Output mask
         href: database-engine/configure-windows/affinity-input-output-mask-server-configuration-option.md
       - name: affinity64 Input-Output mask
