Add option to Hard Delete instance

Remove legacy BlockingSnapshot table.  Don't need to handle deletes for this table - should be removed instead.
Add SPs to remove data for a specific instance from various tables.  Can also be used to reduce retention for a specific instance (Not efficient compared to partition switching though)
Add data cleanup for BlockingSnapshotSummary table based on retention settings for RunningQueries.
Add indexes to help support delete operation
Remove certain FKs to avoid the need for a supporting index. #119
Update Docs

DBADashDB/DBADashDB.sqlproj

@@ -34,6 +34,7 @@
     <AllowSnapshotIsolation>True</AllowSnapshotIsolation>
     <CompatibilityMode>130</CompatibilityMode>
     <TargetFrameworkProfile />
+    <AutoUpdateStatisticsAsynchronously>True</AutoUpdateStatisticsAsynchronously>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <BuildScriptName>$(MSBuildProjectName).sql</BuildScriptName>
@@ -219,10 +220,6 @@
     <Build Include="Report\Stored Procedures\AWSDriver_Get.sql" />
     <Build Include="Report\Stored Procedures\Drivers_Get.sql" />
     <Build Include="dbo\Tables\BlockingSnapshotSummary.sql" />
-    <Build Include="dbo\Tables\BlockingSnapshot.sql" />
-    <Build Include="dbo\Stored Procedures\BlockingSnapshot_Upd.sql" />
-    <Build Include="dbo\User Defined Types\BlockingSnapshot.sql" />
-    <Build Include="dbo\Functions\BlockingSnapshotRecursiveStats.sql" />
     <Build Include="Report\Stored Procedures\BlockingSummary.sql" />
     <Build Include="Report\Stored Procedures\Blocking.sql" />
     <Build Include="Staging\Tables\IOStats.sql" />
@@ -254,14 +251,11 @@
     <Build Include="Security\Switch.sql" />
     <Build Include="Switch\Tables\Waits.sql" />
     <Build Include="Switch\Tables\CPU.sql" />
-    <Build Include="Switch\Tables\BlockingSnapshot.sql" />
     <Build Include="dbo\Tables\DataRetention.sql" />
     <Build Include="Storage\PF_Waits.sql" />
     <Build Include="Storage\PF_CPU.sql" />
-    <Build Include="Storage\PF_BlockingSnapshot.sql" />
     <Build Include="Storage\PS_Waits.sql" />
     <Build Include="Storage\PS_CPU.sql" />
-    <Build Include="Storage\PS_BlockingSnapshot.sql" />
     <Build Include="dbo\Stored Procedures\PurgeData.sql" />
     <Build Include="dbo\Tables\OSLoadedModules.sql" />
     <Build Include="dbo\Tables\DBTuningOptionsHistory.sql" />
@@ -648,6 +642,31 @@
     <Build Include="dbo\Stored Procedures\InstanceAlias_Upd.sql" />
     <Build Include="dbo\Stored Procedures\CounterThresholds_Upd.sql" />
     <Build Include="dbo\Stored Procedures\CounterThresholds_Get.sql" />
+    <Build Include="dbo\Stored Procedures\AzureDBElasticPoolResourceStats_Del.sql" />
+    <Build Include="dbo\Stored Procedures\AzureDBElasticPoolResourceStats_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\AzureDBResourceStats_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\AzureDBResourceStats_Del.sql" />
+    <Build Include="dbo\Stored Procedures\CPU_Del.sql" />
+    <Build Include="dbo\Stored Procedures\CPU_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\DBIOStats_Del.sql" />
+    <Build Include="dbo\Stored Procedures\DBIOStats_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\JobStats_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\MemoryUsage_Del.sql" />
+    <Build Include="dbo\Stored Procedures\ObjectExecutionStats_Del.sql" />
+    <Build Include="dbo\Stored Procedures\ObjectExecutionStats_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\PerformanceCounters_Del.sql" />
+    <Build Include="dbo\Stored Procedures\PerformanceCounters_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\RunningQueries_Del.sql" />
+    <Build Include="dbo\Stored Procedures\RunningQueriesSummary_Del.sql" />
+    <Build Include="dbo\Stored Procedures\SessionWaits_Del.sql" />
+    <Build Include="dbo\Stored Procedures\SlowQueries_Del.sql" />
+    <Build Include="dbo\Stored Procedures\SlowQueriesStats_Del.sql" />
+    <Build Include="dbo\Stored Procedures\Waits_Del.sql" />
+    <Build Include="dbo\Stored Procedures\Waits_60MIN_Del.sql" />
+    <Build Include="dbo\Stored Procedures\DBFileSnapshot_Del.sql" />
+    <Build Include="dbo\Stored Procedures\DriveSnapshot_Del.sql" />
+    <Build Include="dbo\Stored Procedures\PurgeBlockingSnapshotSummary.sql" />
+    <Build Include="dbo\Stored Procedures\BlockingSnapshotSummary_Del.sql" />
   </ItemGroup>
   <ItemGroup>
     <PostDeploy Include="Script.PostDeployment1.sql" />

DBADashDB/Script.PostDeployment1.sql

@@ -1125,7 +1125,6 @@ FROM (VALUES('ObjectExecutionStats',120),
 				('Waits',120),
 				('DBIOStats',120),
 				('CPU',365),
-				('BlockingSnapshot',120),
 				('SlowQueries',120),
 				('AzureDBElasticPoolResourceStats',120),
 				('AzureDBResourceStats',120),
@@ -1588,7 +1587,9 @@ FROM (VALUES('PurgeCollectionErrorLog_StartDate'),
 			('PurgeQueryPlans_CompletedDate'),
 			('PurgePartitions_StartDate'),
 			('PurgePartitions_CompletedDate'),
-			('MemoryDumpAckDate')
+			('MemoryDumpAckDate'),
+			('PurgeBlockingSnapshotSummary_CompletedDate'),
+			('PurgeBlockingSnapshotSummary_StartDate')
 	  ) T(SettingName)
 WHERE NOT EXISTS(SELECT 1 
 				FROM dbo.Settings S
@@ -1799,3 +1800,4 @@ WHEN NOT MATCHED BY TARGET THEN
 INSERT(object_name,counter_name,instance_name,SystemCriticalFrom,SystemCriticalTo,SystemWarningFrom,SystemWarningTo,SystemGoodFrom,SystemGoodTo)
 VALUES(object_name,counter_name,instance_name,SystemCriticalFrom,SystemCriticalTo,SystemWarningFrom,SystemWarningTo,SystemGoodFrom,SystemGoodTo);
 
+ALTER DATABASE [$(DatabaseName)] SET AUTO_UPDATE_STATISTICS_ASYNC ON WITH NO_WAIT

DBADashDB/Switch/Tables/ObjectExecutionStats_60MIN.sql

@@ -11,7 +11,6 @@
     [execution_count]      BIGINT          NOT NULL,
     [IsCompile]            BIT             NOT NULL,
     [MaxExecutionsPerMin]  DECIMAL (19, 6) NULL,
-    CONSTRAINT [PK_ObjectExecutionStats_60MIN] PRIMARY KEY CLUSTERED ([InstanceID] ASC, [SnapshotDate] ASC, [ObjectID] ASC) WITH (DATA_COMPRESSION = PAGE),
-    CONSTRAINT [FK_ObjectExecutionStats_60MIN_DBObjects] FOREIGN KEY ([ObjectID]) REFERENCES [dbo].[DBObjects] ([ObjectID])
+    CONSTRAINT [PK_ObjectExecutionStats_60MIN] PRIMARY KEY CLUSTERED ([InstanceID] ASC, [SnapshotDate] ASC, [ObjectID] ASC) WITH (DATA_COMPRESSION = PAGE)
 );
 

DBADashDB/dbo/Stored Procedures/AzureDBElasticPoolResourceStats_60MIN_Del.sql

@@ -0,0 +1,29 @@
+CREATE PROC dbo.AzureDBElasticPoolResourceStats_60MIN_Del(
+	@InstanceID INT,
+	@DaysToKeep INT,
+	@BatchSize INT = 500000
+)
+AS
+/* 
+	Partitioning switching is used to efficiently remove data from this table for all instances.  
+	This proc provides an alternative way to remove data associated with a specific instance.
+*/
+SET NOCOUNT ON
+DECLARE @MaxDate DATETIME2
+SELECT @MaxDate = CASE WHEN @DaysToKeep  = 0 THEN '30000101' ELSE DATEADD(d,-@DaysToKeep,GETUTCDATE()) END
+
+WHILE 1=1
+BEGIN
+	DELETE EPRS 
+	FROM dbo.AzureDBElasticPoolResourceStats_60MIN EPRS
+	WHERE EXISTS(SELECT 1 
+				FROM dbo.AzureDBElasticPool EP
+				WHERE EP.InstanceID = @InstanceID
+				AND EP.PoolID = EPRS.PoolID
+				)
+	AND end_time < @MaxDate
+	OPTION(RECOMPILE)
+
+	IF @@ROWCOUNT < @BatchSize
+		BREAK
+END

DBADashDB/dbo/Stored Procedures/AzureDBElasticPoolResourceStats_Del.sql

@@ -0,0 +1,29 @@
+CREATE PROC dbo.AzureDBElasticPoolResourceStats_Del(
+	@InstanceID INT,
+	@DaysToKeep INT,
+	@BatchSize INT = 500000
+)
+AS
+/* 
+	Partitioning switching is used to efficiently remove data from this table for all instances.  
+	This proc provides an alternative way to remove data associated with a specific instance.
+*/
+SET NOCOUNT ON
+DECLARE @MaxDate DATETIME2
+SELECT @MaxDate = CASE WHEN @DaysToKeep  = 0 THEN '30000101' ELSE DATEADD(d,-@DaysToKeep,GETUTCDATE()) END
+
+WHILE 1=1
+BEGIN
+	DELETE EPRS 
+	FROM dbo.AzureDBElasticPoolResourceStats EPRS
+	WHERE EXISTS(SELECT 1 
+				FROM dbo.AzureDBElasticPool EP
+				WHERE EP.InstanceID = @InstanceID
+				AND EP.PoolID = EPRS.PoolID
+				)
+	AND end_time < @MaxDate
+	OPTION(RECOMPILE)
+
+	IF @@ROWCOUNT < @BatchSize
+		BREAK
+END

DBADashDB/dbo/Stored Procedures/AzureDBResourceStats_60MIN_Del.sql

@@ -0,0 +1,25 @@
+CREATE PROC dbo.AzureDBResourceStats_60MIN_Del(
+	@InstanceID INT,
+	@DaysToKeep INT,
+	@BatchSize INT=500000
+)
+AS
+/* 
+	Partitioning switching is used to efficiently remove data from this table for all instances.  
+	This proc provides an alternative way to remove data associated with a specific instance.
+*/
+SET NOCOUNT ON
+DECLARE @MaxDate DATETIME2(3)
+SELECT @MaxDate = CASE WHEN @DaysToKeep  = 0 THEN '30000101' ELSE DATEADD(d,-@DaysToKeep,GETUTCDATE()) END
+
+WHILE 1=1
+BEGIN
+	DELETE TOP(@BatchSize) EPRS 
+	FROM dbo.AzureDBResourceStats_60MIN EPRS
+	WHERE InstanceID = @InstanceID
+	AND end_time < @MaxDate
+	OPTION(RECOMPILE)
+
+	IF @@ROWCOUNT < @BatchSize
+		BREAK
+END

DBADashDB/dbo/Stored Procedures/AzureDBResourceStats_Del.sql

@@ -0,0 +1,25 @@
+CREATE PROC dbo.AzureDBResourceStats_Del(
+	@InstanceID INT,
+	@DaysToKeep INT,
+	@BatchSize INT=500000
+)
+AS
+/* 
+	Partitioning switching is used to efficiently remove data from this table for all instances.  
+	This proc provides an alternative way to remove data associated with a specific instance.
+*/
+SET NOCOUNT ON
+DECLARE @MaxDate DATETIME2(3)
+SELECT @MaxDate = CASE WHEN @DaysToKeep  = 0 THEN '30000101' ELSE DATEADD(d,-@DaysToKeep,GETUTCDATE()) END
+
+WHILE 1=1
+BEGIN
+	DELETE TOP(@BatchSize) EPRS 
+	FROM dbo.AzureDBResourceStats EPRS
+	WHERE InstanceID = @InstanceID
+	AND end_time < @MaxDate
+	OPTION(RECOMPILE)
+
+	IF @@ROWCOUNT < @BatchSize
+		BREAK
+END

DBADashDB/dbo/Stored Procedures/BlockingSnapshotSummary_Del.sql

@@ -0,0 +1,28 @@
+CREATE PROC dbo.BlockingSnapshotSummary_Del(
+	@InstanceID INT,
+	@DaysToKeep INT,
+	@BatchSize INT = 500000
+)
+AS
+/* 
+	Partitioning switching is used to efficiently remove data from this table for all instances.  
+	This proc provides an alternative way to remove data associated with a specific instance.
+*/
+SET NOCOUNT ON
+DECLARE @MaxDate DATETIME2
+SELECT @MaxDate = CASE WHEN @DaysToKeep  = 0 THEN '30000101' ELSE DATEADD(d,-@DaysToKeep,GETUTCDATE()) END
+
+SELECT @MaxDate = DATEADD(d,-RetentionDays,GETUTCDATE())
+FROM dbo.DataRetention
+WHERE TableName = 'RunningQueries'
+
+WHILE 1=1
+BEGIN
+	DELETE TOP(@BatchSize) 
+	FROM dbo.BlockingSnapshotSummary
+	WHERE SnapshotDateUTC < @MaxDate
+	AND InstanceID  = @InstanceID
+
+	IF @@ROWCOUNT<@BatchSize
+		BREAK
+END