Per-database exclusions for collectors — Lite side (closes #887)

Lite/Models/ServerConnection.cs

@@ -95,6 +95,13 @@ public bool UseWindowsAuth
     /// </summary>
     public bool MultiSubnetFailover { get; set; } = false;
 
+    /// <summary>
+    /// User databases to skip in per-database collectors (query_store, file_io_stats, etc.).
+    /// System databases (master/tempdb/model/msdb) and the connection database itself are always
+    /// excluded by the collectors and aren't represented here.
+    /// </summary>
+    public System.Collections.Generic.List<string> ExcludedDatabases { get; set; } = new();
+
     /// <summary>
     /// Server name with "(Read-Only)" suffix when ReadOnlyIntent is enabled.
     /// Used for sidebar subtitle and status text.

Lite/Services/RemoteCollectorService.DatabaseSize.cs

@@ -30,7 +30,7 @@ private async Task<int> CollectDatabaseSizeStatsAsync(ServerConnection server, C
         var serverStatus = _serverManager.GetConnectionStatus(server.Id);
         bool isAzureSqlDb = serverStatus?.SqlEngineEdition == 5;
 
-        const string onPremQuery = @"
+        string onPremQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 SET NOCOUNT ON;
 
@@ -52,6 +52,7 @@ FROM sys.databases AS d
     WHERE d.state_desc = N'ONLINE'
     AND   d.database_id > 0
     AND   HAS_DBACCESS(d.name) = 1
+    /*EXCLUSION_FILTER_CURSOR*/
     ORDER BY
         d.name;
 
@@ -131,11 +132,19 @@ LEFT JOIN #file_space AS fs
   ON  fs.database_id = mf.database_id
   AND fs.file_id = mf.file_id
 WHERE d.state_desc = N'ONLINE'
+/*EXCLUSION_FILTER_OUTER*/
 ORDER BY
     d.name,
     mf.file_id
 OPTION(RECOMPILE);";
 
+        /* Both filter sites (cursor SELECT and final SELECT) are in outer T-SQL, not nested dynamic SQL,
+           so parameter bindings work fine and the same @excl_db_N can be referenced twice. */
+        var (dbSizeExclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        onPremQuery = onPremQuery
+            .Replace("/*EXCLUSION_FILTER_CURSOR*/", dbSizeExclusionClause)
+            .Replace("/*EXCLUSION_FILTER_OUTER*/", dbSizeExclusionClause);
+
         const string azureSqlDbQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
@@ -231,6 +240,8 @@ ORDER BY
             using var sqlConnection = await CreateConnectionAsync(server, cancellationToken);
             using var command = new SqlCommand(onPremQuery, sqlConnection);
             command.CommandTimeout = CommandTimeoutSeconds;
+            var (_, dbSizeExclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+            foreach (var p in dbSizeExclusionParams) command.Parameters.Add(p);
 
             using var reader = await command.ExecuteReaderAsync(cancellationToken);
             while (await reader.ReadAsync(cancellationToken))

Lite/Services/RemoteCollectorService.FileIo.cs

@@ -83,8 +83,13 @@ LEFT JOIN sys.databases AS d
 WHERE (vfs.database_id > 4 OR vfs.database_id = 2)
 AND   vfs.database_id < 32761
 AND   vfs.database_id <> ISNULL(DB_ID(N'PerformanceMonitor'), 0)
+/*EXCLUSION_FILTER*/
 OPTION(RECOMPILE);";
 
+        /* Azure path filters via GetAzureDatabaseListAsync; on-prem path injects here */
+        var (fileIoExclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        query = query.Replace("/*EXCLUSION_FILTER*/", isAzureSqlDb ? string.Empty : fileIoExclusionClause);
+
         var serverId = GetServerId(server);
         var collectionTime = DateTime.UtcNow;
         var rowsCollected = 0;
@@ -125,6 +130,8 @@ AND   vfs.database_id < 32761
         {
             using var sqlConnection = await CreateConnectionAsync(server, cancellationToken);
             using var command = new SqlCommand(query, sqlConnection) { CommandTimeout = CommandTimeoutSeconds };
+            var (_, fileIoExclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+            foreach (var p in fileIoExclusionParams) command.Parameters.Add(p);
             using var reader = await command.ExecuteReaderAsync(cancellationToken);
             while (await reader.ReadAsync(cancellationToken))
                 fileStats.Add(ReadFileIoRow(reader));

Lite/Services/RemoteCollectorService.ProcedureStats.cs

@@ -32,7 +32,7 @@ so the standard NOT IN filter excludes everything. Use a simplified query. */
         /* total_spills/min_spills/max_spills exist in dm_exec_procedure_stats and dm_exec_trigger_stats
            on all supported versions, but do NOT exist in dm_exec_function_stats on any version.
            Use dynamic SQL to handle this. */
-        const string standardQuery = @"
+        string standardQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
 DECLARE
@@ -81,6 +81,7 @@ INNER JOIN sys.databases AS d
 WHERE d.state = 0
 AND   pa.dbid NOT IN (1, 3, 4, 32761, 32767, ISNULL(DB_ID(N''PerformanceMonitor''), 0))
 AND   s.last_execution_time >= DATEADD(MINUTE, -10, GETDATE())
+/*EXCLUSION_FILTER*/
 
 UNION ALL
 
@@ -136,6 +137,7 @@ INNER JOIN sys.databases AS d
 WHERE d.state = 0
 AND   pa.dbid NOT IN (1, 3, 4, 32761, 32767, ISNULL(DB_ID(N''PerformanceMonitor''), 0))
 AND   s.last_execution_time >= DATEADD(MINUTE, -10, GETDATE())
+/*EXCLUSION_FILTER*/
 
 UNION ALL
 
@@ -178,6 +180,7 @@ INNER JOIN sys.databases AS d
 WHERE d.state = 0
 AND   pa.dbid NOT IN (1, 3, 4, 32761, 32767, ISNULL(DB_ID(N''PerformanceMonitor''), 0))
 AND   s.last_execution_time >= DATEADD(MINUTE, -10, GETDATE())
+/*EXCLUSION_FILTER*/
 ) AS combined
 ORDER BY total_elapsed_time DESC
 OPTION(RECOMPILE);' AS nvarchar(max));
@@ -220,9 +223,19 @@ No trigger stats or function stats — Azure SQL DB scope is single-database. */
 FROM sys.dm_exec_procedure_stats AS s
 WHERE s.database_id = DB_ID()
 AND   s.last_execution_time >= DATEADD(MINUTE, -10, GETDATE())
+/*EXCLUSION_FILTER*/
 ORDER BY s.total_elapsed_time DESC
 OPTION(RECOMPILE);";
 
+        /* Standard query is dynamic SQL (built into @sql then passed to sp_executesql), so the
+           exclusion filter is interpolated as literal N'...' values rather than parameter bindings.
+           Names come from a user-picked checklist of existing DBs, escaped against single-quote
+           injection. forNestedDynamicSql=true doubles the escape because @sql is itself a
+           single-quoted T-SQL string at the outer layer. */
+        string standardExclusionClause = BuildDatabaseExclusionLiteralClause(
+            server.ExcludedDatabases, "d.name", forNestedDynamicSql: true);
+        standardQuery = standardQuery.Replace("/*EXCLUSION_FILTER*/", standardExclusionClause);
+
         string query = isAzureSqlDb ? azureSqlDbQuery : standardQuery;
 
         var serverId = GetServerId(server);

Lite/Services/RemoteCollectorService.QuerySnapshots.cs

@@ -232,6 +232,18 @@ private async Task<int> CollectQuerySnapshotsAsync(ServerConnection server, Canc
 
         var query = BuildQuerySnapshotsQuery(supportsLiveQueryPlan, isAzureSqlDatabase);
 
+        /* Append the per-database exclusion filter to the WHERE clause. The base query joins
+           sys.databases AS d, so we filter on d.name. When ExcludedDatabases is empty the
+           clause is "" so nothing changes. */
+        var (qsExclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        if (!string.IsNullOrEmpty(qsExclusionClause))
+        {
+            /* Inject just before the OPTION clause so it lands inside the WHERE. */
+            query = query.Replace(
+                "ORDER BY der.cpu_time DESC",
+                qsExclusionClause + "\nORDER BY der.cpu_time DESC");
+        }
+
         var serverId = GetServerId(server);
         var collectionTime = DateTime.UtcNow;
         var rowsCollected = 0;
@@ -242,6 +254,8 @@ private async Task<int> CollectQuerySnapshotsAsync(ServerConnection server, Canc
         using var sqlConnection = await CreateConnectionAsync(server, cancellationToken);
         using var command = new SqlCommand(query, sqlConnection);
         command.CommandTimeout = CommandTimeoutSeconds;
+        var (_, qsExclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        foreach (var p in qsExclusionParams) command.Parameters.Add(p);
 
         using var reader = await command.ExecuteReaderAsync(cancellationToken);
         sqlSw.Stop();

Lite/Services/RemoteCollectorService.QueryStats.cs

@@ -31,7 +31,7 @@ Use a simplified query that skips plan_attributes entirely — there's only one
         var serverStatus = _serverManager.GetConnectionStatus(server.Id);
         bool isAzureSqlDb = serverStatus.SqlEngineEdition == 5;
 
-        const string standardQuery = @"
+        string standardQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
 SELECT /* PerformanceMonitorLite */ TOP (200)
@@ -106,10 +106,14 @@ INNER JOIN sys.databases AS d
 WHERE pa.dbid NOT IN (1, 2, 3, 4, 32761, 32767, ISNULL(DB_ID(N'PerformanceMonitor'), 0))
 AND   st.text NOT LIKE N'%PerformanceMonitorLite%'
 AND   qs.last_execution_time >= DATEADD(MINUTE, -10, GETDATE())
+/*EXCLUSION_FILTER*/
 ORDER BY
     qs.total_elapsed_time DESC
 OPTION(RECOMPILE);";
 
+        var (exclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        standardQuery = standardQuery.Replace("/*EXCLUSION_FILTER*/", exclusionClause);
+
         /* Azure SQL DB: skip plan_attributes, use DB_NAME() for the single database context */
         const string azureSqlDbQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
@@ -229,6 +233,11 @@ qs.total_elapsed_time DESC
                 {
                 using var command = new SqlCommand(query, sqlConnection);
                 command.CommandTimeout = CommandTimeoutSeconds;
+                if (!isAzureSqlDb)
+                {
+                    var (_, freshParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+                    foreach (var p in freshParams) command.Parameters.Add(p);
+                }
 
                 using var reader = await command.ExecuteReaderAsync(cancellationToken);
 

Lite/Services/RemoteCollectorService.QueryStore.cs

@@ -32,7 +32,7 @@ Uses sys.database_query_store_options.actual_state instead of
         var serverStatus = _serverManager.GetConnectionStatus(server.Id);
         bool isAzureSqlDb = serverStatus?.SqlEngineEdition == 5;
 
-        const string onPremDbQuery = @"
+        string onPremDbQuery = @"
 SET NOCOUNT ON;
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
@@ -60,6 +60,7 @@ AND   d.name <> N'PerformanceMonitor'
         drs.database_id IS NULL          /*not in any AG*/
         OR drs.is_primary_replica = 1    /*primary replica*/
     )
+    /*EXCLUSION_FILTER*/
     OPTION(RECOMPILE);
 
 OPEN db_check;
@@ -103,7 +104,7 @@ FROM @result
 ORDER BY
     name;";
 
-        const string azureDbQuery = @"
+        string azureDbQuery = @"
 SET NOCOUNT ON;
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
@@ -123,6 +124,7 @@ WHERE d.database_id > 4
     AND   d.database_id < 32761
     AND   d.state_desc = N'ONLINE'
     AND   d.name <> N'PerformanceMonitor'
+    /*EXCLUSION_FILTER*/
     OPTION(RECOMPILE);
 
 OPEN db_check;
@@ -166,6 +168,10 @@ FROM @result
 ORDER BY
     name;";
 
+        var (exclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        onPremDbQuery = onPremDbQuery.Replace("/*EXCLUSION_FILTER*/", exclusionClause);
+        azureDbQuery = azureDbQuery.Replace("/*EXCLUSION_FILTER*/", exclusionClause);
+
         string dbQuery = isAzureSqlDb ? azureDbQuery : onPremDbQuery;
 
         var serverId = GetServerId(server);
@@ -187,6 +193,8 @@ ORDER BY
         using (var dbCommand = new SqlCommand(dbQuery, sqlConnection))
         {
             dbCommand.CommandTimeout = CommandTimeoutSeconds;
+            var (_, exclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+            foreach (var p in exclusionParams) dbCommand.Parameters.Add(p);
             using var dbReader = await dbCommand.ExecuteReaderAsync(cancellationToken);
             while (await dbReader.ReadAsync(cancellationToken))
             {

Lite/Services/RemoteCollectorService.ServerConfig.cs

@@ -149,6 +149,8 @@ private async Task<int> CollectDatabaseConfigAsync(ServerConnection server, Canc
     is_optimized_locking_on = d.is_optimized_locking_on";
         }
 
+        var (dbConfigExclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+
         var query = $@"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
@@ -158,6 +160,7 @@ FROM sys.databases AS d
 WHERE (d.database_id > 4 OR d.database_id = 2)
 AND   d.database_id < 32761
 AND   d.name <> N'PerformanceMonitor'
+{dbConfigExclusionClause}
 ORDER BY d.name
 OPTION(RECOMPILE);";
 
@@ -173,6 +176,8 @@ ORDER BY d.name
         using var sqlConnection = await CreateConnectionAsync(server, cancellationToken);
         using var command = new SqlCommand(query, sqlConnection);
         command.CommandTimeout = CommandTimeoutSeconds;
+        var (_, dbConfigExclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        foreach (var p in dbConfigExclusionParams) command.Parameters.Add(p);
 
         using var reader = await command.ExecuteReaderAsync(cancellationToken);
         while (await reader.ReadAsync(cancellationToken))
@@ -329,7 +334,7 @@ private async Task<int> CollectDatabaseScopedConfigAsync(ServerConnection server
         var serverStatus = _serverManager.GetConnectionStatus(server.Id);
         bool isAzureSqlDb = serverStatus?.SqlEngineEdition == 5;
 
-        const string onPremDbQuery = @"
+        string onPremDbQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
 SELECT
@@ -347,10 +352,11 @@ AND   d.name <> N'PerformanceMonitor'
     drs.database_id IS NULL          /*not in any AG*/
     OR drs.is_primary_replica = 1    /*primary replica*/
 )
+/*EXCLUSION_FILTER*/
 ORDER BY d.name
 OPTION(RECOMPILE);";
 
-        const string azureDbQuery = @"
+        string azureDbQuery = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
 SELECT
@@ -360,9 +366,14 @@ FROM sys.databases AS d
 AND   d.database_id < 32761
 AND   d.name <> N'PerformanceMonitor'
 AND   d.state_desc = N'ONLINE'
+/*EXCLUSION_FILTER*/
 ORDER BY d.name
 OPTION(RECOMPILE);";
 
+        var (scopedExclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        onPremDbQuery = onPremDbQuery.Replace("/*EXCLUSION_FILTER*/", scopedExclusionClause);
+        azureDbQuery = azureDbQuery.Replace("/*EXCLUSION_FILTER*/", scopedExclusionClause);
+
         string dbQuery = isAzureSqlDb ? azureDbQuery : onPremDbQuery;
 
         var serverId = GetServerId(server);
@@ -379,6 +390,8 @@ ORDER BY d.name
         using (var dbCommand = new SqlCommand(dbQuery, sqlConnection))
         {
             dbCommand.CommandTimeout = CommandTimeoutSeconds;
+            var (_, scopedExclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+            foreach (var p in scopedExclusionParams) dbCommand.Parameters.Add(p);
             using var dbReader = await dbCommand.ExecuteReaderAsync(cancellationToken);
             while (await dbReader.ReadAsync(cancellationToken))
             {

Lite/Services/RemoteCollectorService.WaitingTasks.cs

@@ -24,7 +24,7 @@ public partial class RemoteCollectorService
     /// </summary>
     private async Task<int> CollectWaitingTasksAsync(ServerConnection server, CancellationToken cancellationToken)
     {
-        const string query = @"
+        string query = @"
 SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
 
 SELECT /* PerformanceMonitorLite */
@@ -42,8 +42,12 @@ LEFT JOIN sys.databases AS d
 AND   wt.session_id <> @@SPID
 AND   wt.wait_type IS NOT NULL
 AND   er.database_id <> ISNULL(DB_ID(N'PerformanceMonitor'), 0)
+/*EXCLUSION_FILTER*/
 OPTION(RECOMPILE);";
 
+        var (exclusionClause, _) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        query = query.Replace("/*EXCLUSION_FILTER*/", exclusionClause);
+
         var serverId = GetServerId(server);
         var collectionTime = DateTime.UtcNow;
         var rowsCollected = 0;
@@ -54,6 +58,8 @@ AND   wt.wait_type IS NOT NULL
         using var sqlConnection = await CreateConnectionAsync(server, cancellationToken);
         using var command = new SqlCommand(query, sqlConnection);
         command.CommandTimeout = CommandTimeoutSeconds;
+        var (_, exclusionParams) = BuildDatabaseExclusionFilter(server.ExcludedDatabases, "d.name");
+        foreach (var p in exclusionParams) command.Parameters.Add(p);
 
         using var reader = await command.ExecuteReaderAsync(cancellationToken);
         sqlSw.Stop();