diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingExecutors/ShardingExecutor.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingExecutors/ShardingExecutor.cs
index e88f1d59..374922e2 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingExecutors/ShardingExecutor.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingExecutors/ShardingExecutor.cs
@@ -13,42 +13,31 @@ using ShardingCore.Sharding.MergeEngines.Executors.Abstractions;
 
 namespace ShardingCore.Sharding.MergeEngines.ShardingExecutors
 {
-    internal class ShardingExecutor
+    internal static class ShardingExecutor
     {
-        private static readonly ShardingExecutor _instance;
 
-        private ShardingExecutor()
-        {
-        }
 
-        static ShardingExecutor()
-        {
-            _instance = new ShardingExecutor();
-        }
-
-        public static ShardingExecutor Instance => _instance;
-
-        public TResult Execute<TResult>(StreamMergeContext streamMergeContext,
+        public static TResult Execute<TResult>(StreamMergeContext streamMergeContext,
             IExecutor<TResult> executor, bool async, IEnumerable<ISqlRouteUnit> sqlRouteUnits,
             CancellationToken cancellationToken = new CancellationToken())
         {
-            return ExecuteAsync<TResult>(streamMergeContext, executor, async, sqlRouteUnits, cancellationToken)
-                .WaitAndUnwrapException();
+            return ExecuteAsync(streamMergeContext, executor,async,sqlRouteUnits,cancellationToken).WaitAndUnwrapException(false);
         }
-        public  async Task<TResult> ExecuteAsync<TResult>(StreamMergeContext streamMergeContext,
+        public static async Task<TResult> ExecuteAsync<TResult>(StreamMergeContext streamMergeContext,
             IExecutor<TResult> executor, bool async, IEnumerable<ISqlRouteUnit> sqlRouteUnits,
             CancellationToken cancellationToken = new CancellationToken())
         {
             var resultGroups =
-                Execute0<TResult>(streamMergeContext, executor, async, sqlRouteUnits, cancellationToken);
-            var results =(await TaskHelper.WhenAllFastFail(resultGroups)).SelectMany(o => o)
+                Execute0<TResult>(streamMergeContext, executor, async, sqlRouteUnits, cancellationToken).ToArray();
+            var results = (await TaskHelper.WhenAllFastFail(resultGroups).ConfigureAwait(false)).SelectMany(o => o)
                 .ToList();
             if (results.IsEmpty())
                 throw new ShardingCoreException("sharding execute result empty");
-            return executor.GetShardingMerger().StreamMerge(results);
+            var streamMerge = executor.GetShardingMerger().StreamMerge(results);
+            return streamMerge;
         }
 
-        private Task<List<TResult>>[] Execute0<TResult>(StreamMergeContext streamMergeContext,
+        private static Task<List<TResult>>[] Execute0<TResult>(StreamMergeContext streamMergeContext,
             IExecutor<TResult> executor, bool async, IEnumerable<ISqlRouteUnit> sqlRouteUnits,
             CancellationToken cancellationToken = new CancellationToken())
         {
@@ -87,7 +76,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingExecutors
         /// <param name="streamMergeContext"></param>
         /// <param name="sqlRouteUnits"></param>
         /// <returns></returns>
-        private IEnumerable<ISqlRouteUnit> ReOrderTableTails(StreamMergeContext streamMergeContext,
+        private static IEnumerable<ISqlRouteUnit> ReOrderTableTails(StreamMergeContext streamMergeContext,
             IEnumerable<ISqlRouteUnit> sqlRouteUnits)
         {
             if (streamMergeContext.IsSeqQuery())
@@ -106,7 +95,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingExecutors
         /// <param name="streamMergeContext"></param>
         /// <param name="sqlGroups"></param>
         /// <returns></returns>
-        protected DataSourceSqlExecutorUnit GetSqlExecutorGroups(StreamMergeContext streamMergeContext,
+        private static DataSourceSqlExecutorUnit GetSqlExecutorGroups(StreamMergeContext streamMergeContext,
             IGrouping<string, ISqlRouteUnit> sqlGroups)
         {
             var maxQueryConnectionsLimit = streamMergeContext.GetMaxQueryConnectionsLimit();
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureMergeEngine.cs
index 79d30480..a4b25816 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureMergeEngine.cs
@@ -23,7 +23,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines.Abstractions.I
         protected abstract IExecutor<TResult> CreateExecutor();
         public virtual TResult MergeResult()
         {
-            return MergeResultAsync().WaitAndUnwrapException();
+            return MergeResultAsync().WaitAndUnwrapException(false);
         }
 
         public virtual async Task<TResult> MergeResultAsync(CancellationToken cancellationToken = new CancellationToken())
@@ -35,7 +35,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines.Abstractions.I
             }
             var defaultSqlRouteUnits = GetDefaultSqlRouteUnits();
             var executor = CreateExecutor();
-            var result =await ShardingExecutor.Instance.ExecuteAsync<TResult>(GetStreamMergeContext(),executor,true,defaultSqlRouteUnits,cancellationToken);
+            var result =await ShardingExecutor.ExecuteAsync<TResult>(GetStreamMergeContext(),executor,true,defaultSqlRouteUnits,cancellationToken).ConfigureAwait(false);
             return result;
         }
     }
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureWrapMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureWrapMergeEngine.cs
index ec16d236..6580dbb2 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureWrapMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/InMemoryMerge/AbstractMethodEnsureWrapMergeEngine.cs
@@ -17,7 +17,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines.Abstractions.I
         protected abstract IExecutor<RouteQueryResult<TResult>> CreateExecutor();
         public virtual TResult MergeResult()
         {
-            return MergeResultAsync().WaitAndUnwrapException();
+            return MergeResultAsync().WaitAndUnwrapException(false);
         }
 
         public  async Task<TResult> MergeResultAsync(CancellationToken cancellationToken = new CancellationToken())
@@ -29,7 +29,8 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines.Abstractions.I
             }
             var defaultSqlRouteUnits = GetDefaultSqlRouteUnits();
             var executor = CreateExecutor();
-            var result =await ShardingExecutor.Instance.ExecuteAsync<RouteQueryResult<TResult>>(GetStreamMergeContext(),executor,true,defaultSqlRouteUnits,cancellationToken);
+            var result =await ShardingExecutor.ExecuteAsync<RouteQueryResult<TResult>>(GetStreamMergeContext(),
+                executor, true, defaultSqlRouteUnits, cancellationToken).ConfigureAwait(false);
             return result.QueryResult;
         }
     }
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/StreamMerge/AbstractStreamEnumerable.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/StreamMerge/AbstractStreamEnumerable.cs
index 6ca5881a..44565e92 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/StreamMerge/AbstractStreamEnumerable.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/Abstractions/StreamMerge/AbstractStreamEnumerable.cs
@@ -71,7 +71,8 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines.Abstractions.S
            
             var defaultSqlRouteUnits = GetDefaultSqlRouteUnits();
             var executor = CreateExecutor(async);
-            return ShardingExecutor.Instance.Execute<IStreamMergeAsyncEnumerator<TEntity>>(GetStreamMergeContext(),executor,async,defaultSqlRouteUnits,cancellationToken);
+            return ShardingExecutor.Execute<IStreamMergeAsyncEnumerator<TEntity>>(GetStreamMergeContext(), executor,
+                async, defaultSqlRouteUnits, cancellationToken);
         }
 
         // public abstract IShardingExecutor GetShardingExecutor();
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/AverageAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/AverageAsyncInMemoryMergeEngine.cs
index dc971bfe..a807e972 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/AverageAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/AverageAsyncInMemoryMergeEngine.cs
@@ -34,7 +34,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines
 
         public TResult MergeResult()
         {
-            return MergeResultAsync().WaitAndUnwrapException();
+            return MergeResultAsync().WaitAndUnwrapException(false);
         }
 
         public  async Task<TResult> MergeResultAsync(CancellationToken cancellationToken = new CancellationToken())
@@ -46,7 +46,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines
             }
             var defaultSqlRouteUnits = GetDefaultSqlRouteUnits();
             var executor = CreateExecutor();
-            var result =await ShardingExecutor.Instance.ExecuteAsync(GetStreamMergeContext(),executor,true,defaultSqlRouteUnits,cancellationToken);
+            var result =await ShardingExecutor.ExecuteAsync(GetStreamMergeContext(),executor,true,defaultSqlRouteUnits,cancellationToken).ConfigureAwait(false);
             var sum = result.QueryResult.Sum;
             var count = result.QueryResult.Count;
             // var resultList = await base.ExecuteAsync<AverageResult<TSelect>>(cancellationToken);
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstOrDefaultSkipAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstOrDefaultSkipAsyncInMemoryMergeEngine.cs
index cfd45379..f5b90e60 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstOrDefaultSkipAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstOrDefaultSkipAsyncInMemoryMergeEngine.cs
@@ -37,7 +37,7 @@ namespace ShardingCore.Sharding.MergeEngines
             var asyncEnumeratorStreamMergeEngine = new AsyncEnumeratorStreamMergeEngine<TEntity>(_streamMergeContext);
 
             var take = _streamMergeContext.GetTake();
-            var list = await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take, cancellationToken);
+            var list = await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take, cancellationToken).ConfigureAwait(false);
             return list.FirstOrDefault();
 
         }
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstSkipAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstSkipAsyncInMemoryMergeEngine.cs
index 4e6157d8..343e6aab 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstSkipAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/FirstSkipAsyncInMemoryMergeEngine.cs
@@ -51,7 +51,7 @@ namespace ShardingCore.Sharding.MergeEngines
             //将toke改成1
             var asyncEnumeratorStreamMergeEngine = new AsyncEnumeratorStreamMergeEngine<TEntity>(_streamMergeContext);
             var take = _streamMergeContext.GetTake();
-            var list =await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take,cancellationToken);
+            var list =await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take,cancellationToken).ConfigureAwait(false);
             return list.First();
         }
 
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastOrDefaultSkipAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastOrDefaultSkipAsyncInMemoryMergeEngine.cs
index 82888f30..51ef8fe3 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastOrDefaultSkipAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastOrDefaultSkipAsyncInMemoryMergeEngine.cs
@@ -62,7 +62,7 @@ namespace ShardingCore.Sharding.MergeEngines
             var asyncEnumeratorStreamMergeEngine = new AsyncEnumeratorStreamMergeEngine<TEntity>(_streamMergeContext);
 
             var maxVirtualElementCount = skip.GetValueOrDefault() + 1;
-            var list = await asyncEnumeratorStreamMergeEngine.ToFixedElementStreamListAsync(1,maxVirtualElementCount, cancellationToken);
+            var list = await asyncEnumeratorStreamMergeEngine.ToFixedElementStreamListAsync(1,maxVirtualElementCount, cancellationToken).ConfigureAwait(false);
             if (list.VirtualElementCount >= maxVirtualElementCount)
                 return list.FirstOrDefault();
             return default;
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastSkipAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastSkipAsyncInMemoryMergeEngine.cs
index 8f28a135..a835cae4 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastSkipAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/LastSkipAsyncInMemoryMergeEngine.cs
@@ -62,7 +62,7 @@ namespace ShardingCore.Sharding.MergeEngines
             //将toke改成1
             var asyncEnumeratorStreamMergeEngine = new AsyncEnumeratorStreamMergeEngine<TEntity>(_streamMergeContext);
             var maxVirtualElementCount = skip.GetValueOrDefault() + 1;
-            var list = await asyncEnumeratorStreamMergeEngine.ToFixedElementStreamListAsync(1,maxVirtualElementCount, cancellationToken);
+            var list = await asyncEnumeratorStreamMergeEngine.ToFixedElementStreamListAsync(1,maxVirtualElementCount, cancellationToken).ConfigureAwait(false);
 
             if (list.VirtualElementCount >= maxVirtualElementCount)
                 return list.First();
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MaxAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MaxAsyncInMemoryMergeEngine.cs
index c28c9a7c..c7673336 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MaxAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MaxAsyncInMemoryMergeEngine.cs
@@ -33,7 +33,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines
 
         public TResult MergeResult()
         {
-            return MergeResultAsync().WaitAndUnwrapException();
+            return MergeResultAsync().WaitAndUnwrapException(false);
         }
 
 
@@ -95,7 +95,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines
             }
             var defaultSqlRouteUnits = GetDefaultSqlRouteUnits();
             var executor = CreateExecutor<TR>();
-            var result = await ShardingExecutor.Instance.ExecuteAsync<RouteQueryResult<TR>>(GetStreamMergeContext(), executor, true, defaultSqlRouteUnits, cancellationToken);
+            var result = await ShardingExecutor.ExecuteAsync<RouteQueryResult<TR>>(GetStreamMergeContext(), executor, true, defaultSqlRouteUnits, cancellationToken).ConfigureAwait(false);
             return result.QueryResult;
         }
         protected IExecutor<RouteQueryResult<TR>> CreateExecutor<TR>()
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MinAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MinAsyncInMemoryMergeEngine.cs
index f635f35a..a2da1651 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MinAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/MinAsyncInMemoryMergeEngine.cs
@@ -33,7 +33,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines
         
         public  TResult MergeResult()
         {
-            return MergeResultAsync().WaitAndUnwrapException();
+            return MergeResultAsync().WaitAndUnwrapException(false);
         }
 
 
@@ -95,7 +95,7 @@ namespace ShardingCore.Sharding.MergeEngines.ShardingMergeEngines
             }
             var defaultSqlRouteUnits = GetDefaultSqlRouteUnits();
             var executor = CreateExecutor<TR>();
-            var result = await ShardingExecutor.Instance.ExecuteAsync<RouteQueryResult<TR>>(GetStreamMergeContext(), executor, true, defaultSqlRouteUnits, cancellationToken);
+            var result = await ShardingExecutor.ExecuteAsync<RouteQueryResult<TR>>(GetStreamMergeContext(), executor, true, defaultSqlRouteUnits, cancellationToken).ConfigureAwait(false);
             return result.QueryResult;
         }
 
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleOrDefaultSkipAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleOrDefaultSkipAsyncInMemoryMergeEngine.cs
index 07fdaf79..94aad2c6 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleOrDefaultSkipAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleOrDefaultSkipAsyncInMemoryMergeEngine.cs
@@ -51,7 +51,7 @@ namespace ShardingCore.Sharding.MergeEngines
             var asyncEnumeratorStreamMergeEngine = new AsyncEnumeratorStreamMergeEngine<TEntity>(_streamMergeContext);
 
             var take = _streamMergeContext.GetTake();
-            var list = await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take, cancellationToken);
+            var list = await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take, cancellationToken).ConfigureAwait(false);
             return list.SingleOrDefault();
 
         }
diff --git a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleSkipAsyncInMemoryMergeEngine.cs b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleSkipAsyncInMemoryMergeEngine.cs
index 39876efe..795705cc 100644
--- a/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleSkipAsyncInMemoryMergeEngine.cs
+++ b/src/ShardingCore/Sharding/MergeEngines/ShardingMergeEngines/SingleSkipAsyncInMemoryMergeEngine.cs
@@ -50,7 +50,7 @@ namespace ShardingCore.Sharding.MergeEngines
             var asyncEnumeratorStreamMergeEngine = new AsyncEnumeratorStreamMergeEngine<TEntity>(_streamMergeContext);
 
             var take = _streamMergeContext.GetTake();
-            var list = await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take, cancellationToken);
+            var list = await asyncEnumeratorStreamMergeEngine.ToStreamListAsync(take, cancellationToken).ConfigureAwait(false);
             return list.Single();
 
         }