diff --git a/Makefile b/Makefile
index 327aab9..1d4a4d2 100644
--- a/Makefile
+++ b/Makefile
@@ -86,40 +86,56 @@ endif
 ifeq ($(AQUERY_ITC_USE_SEMPH), 1)
 	Defines += -D__AQUERY_ITC_USE_SEMPH__
 endif
-SHAREDFLAGS += $(FPIC)
+
+CXXFLAGS += $(OPTFLAGS) $(Defines) $(MonetDB_INC) 
+BINARYFLAGS = $(CXXFLAGS) $(LINKFLAGS) $(MonetDB_LIB)
+SHAREDFLAGS += $(FPIC) $(BINARYFLAGS)
 
 info:
-	$(info $(OPTFLAGS))
-	$(info $(OS_SUPPORT))
-	$(info $(OS)) 
-	$(info $(Defines))
-	$(info "test")
-	$(info $(LIBTOOL))
-	$(info $(MonetDB_INC))
-	$(info $(COMPILER))
-	$(info $(CXX))
-	$(info $(FPIC))
+	$(info This makefile script is used in AQuery to automatically build required libraries and executables.)
+	$(info Run it manually only for debugging purposes.)
+	$(info Targets (built by `make <target>`):)
+	$(info $"	pch: generate precompiled header)
+	$(info $"	libaquery.a: build static library)
+	$(info $"	server.so: build execution engine)
+	$(info $"	snippet: build generated query snippet)
+	$(info $"	server_uselib: build execution engine using shared library and pch)
+	$(info $"	snippet_uselib: build generated query snippet using shared library and pch)
+	$(info $"	docker: build docker image with name aquery)
+	$(info $"	launcher: build launcher for aquery ./aq)
+	$(info $"	clean: remove all generated binaraies and caches)
+	$(info )
+	$(info Variables:)
+	$(info $"	OPTFLAGS: $(OPTFLAGS))
+	$(info $"	OS_SUPPORT: $(OS_SUPPORT))
+	$(info $"	OS: $(OS)) 
+	$(info $"	Defines: $(Defines))
+	$(info $"	LIBTOOL: $(LIBTOOL))
+	$(info $"	MonetDB_INC: $(MonetDB_INC))
+	$(info $"	COMPILER: $(COMPILER))
+	$(info $"	CXX: $(CXX))
+	$(info $"	FPIC: $(FPIC))
 pch:
-	$(CXX) -x c++-header server/pch.hpp $(FPIC) $(MonetDB_INC) $(OPTFLAGS) $(CXXFLAGS) $(Defines)
+	$(CXX) -x c++-header server/pch.hpp $(FPIC) $(CXXFLAGS)
 libaquery.a:
-	$(CXX) -c $(FPIC) $(PCHFLAGS) $(LIBAQ_SRC) $(MonetDB_INC) $(MonetDB_LIB) $(OS_SUPPORT) $(Defines) $(OPTFLAGS) $(LINKFLAGS) $(CXXFLAGS) &&\
+	$(CXX) -c $(FPIC) $(PCHFLAGS) $(LIBAQ_SRC) $(MonetDB_LIB) $(OS_SUPPORT) $(CXXFLAGS) &&\
 	$(LIBTOOL) libaquery.a $(LIBAQ_OBJ) &&\
 	$(RANLIB) libaquery.a
 
 server.bin:
-	$(CXX) $(LIBAQ_SRC) $(LINKFLAGS) $(OS_SUPPORT) $(Defines)  $(MonetDB_INC) $(MonetDB_LIB) $(OPTFLAGS) $(CXXFLAGS) -o server.bin
+	$(CXX) $(LIBAQ_SRC) $(BINARYFLAGS) $(OS_SUPPORT) -o server.bin
 launcher:
-	$(CXX) -D__AQ_BUILD_LAUNCHER__ $(LIBAQ_SRC) $(LINKFLAGS) $(OS_SUPPORT) $(Defines)  $(MonetDB_INC) $(MonetDB_LIB) $(OPTFLAGS) $(CXXFLAGS) -o aq
+	$(CXX) -D__AQ_BUILD_LAUNCHER__ $(LIBAQ_SRC) $(OS_SUPPORT) $(BINARYFLAGS) -o aq
 server.so:
 #	$(CXX) -z muldefs server/server.cpp server/monetdb_conn.cpp -fPIC -shared $(OS_SUPPORT) monetdb/msvc/monetdbe.dll --std=c++1z -O3 -march=native -o server.so -I./monetdb/msvc 
-	$(CXX) $(SHAREDFLAGS) $(PCHFLAGS) $(LIBAQ_SRC) $(OS_SUPPORT) $(Defines) $(MonetDB_INC) $(MonetDB_LIB) $(OPTFLAGS) $(LINKFLAGS) $(CXXFLAGS) -o server.so 
+	$(CXX) $(SHAREDFLAGS) $(PCHFLAGS) $(LIBAQ_SRC) $(OS_SUPPORT) -o server.so 
 server_uselib:
-	$(CXX) $(SHAREDFLAGS) $(USELIB_FLAG),libaquery.a $(MonetDB_LIB) $(OPTFLAGS) $(LINKFLAGS) $(CXXFLAGS) -o server.so
+	$(CXX) $(SHAREDFLAGS) $(USELIB_FLAG),libaquery.a -o server.so
 
 snippet:
-	$(CXX) $(SHAREDFLAGS) $(PCHFLAGS) out.cpp $(LIBAQ_SRC) $(MonetDB_INC) $(MonetDB_LIB) $(Defines) $(OPTFLAGS) $(LINKFLAGS) $(CXXFLAGS) -o dll.so
+	$(CXX) $(SHAREDFLAGS) $(PCHFLAGS) out.cpp $(LIBAQ_SRC) -o dll.so
 snippet_uselib:
-	$(CXX) $(SHAREDFLAGS) $(PCHFLAGS) out.cpp libaquery.a $(MonetDB_INC) $(Defines) $(MonetDB_LIB) $(OPTFLAGS) $(LINKFLAGS) $(CXXFLAGS) -o dll.so
+	$(CXX) $(SHAREDFLAGS) $(PCHFLAGS) out.cpp libaquery.a -o dll.so
 
 docker:
 	docker build -t aquery .
diff --git a/prompt.py b/prompt.py
index f257b49..b8ec8d1 100644
--- a/prompt.py
+++ b/prompt.py
@@ -195,7 +195,7 @@ class Config:
         self.new_query = nq
         self.server_mode = mode.value 
         self.running = 1
-        self.backend_type = Backend_Type.BACKEND_AQuery.value
+        self.backend_type = Backend_Type.BACKEND_MonetDB.value
         self.has_dll = 0
         self.n_buffers = n_bufs
         self.monetdb_time = 0
@@ -399,6 +399,8 @@ def prompt(running = lambda:True, next = lambda:input('> '), state = None):
     payload = None
     keep = True
     cxt = engine.initialize()
+    parser.parse('SELECT "**** WELCOME TO AQUERY++! ****";')
+    
     # state.currstats = QueryStats()
     # state.need_print = False
     while running():
diff --git a/server/gc.hpp b/server/gc.hpp
index decd632..246404c 100644
--- a/server/gc.hpp
+++ b/server/gc.hpp
@@ -11,6 +11,7 @@ private:
 	using vector = vector_type<T>;
 	template<class ...T>
 	using tuple = std::tuple<T...>;
+
 	size_t current_size = 0, max_size, 
 		   interval, forced_clean, 
 		   forceclean_timer = 0;
@@ -19,9 +20,9 @@ private:
 	vector<tuple<void*, void (*)(void*)>> *q, *q_back;
 	std::thread handle;
 	std::atomic<std::thread::id> lock;
-
+	// maybe use volatile std::thread::id instead
 protected:
-	void acquire_lock(){
+	void acquire_lock() {
 		auto this_pid = std::this_thread::get_id();
 		while(lock != this_pid)
 		{
@@ -38,7 +39,7 @@ protected:
 
 	void gc()
 	{
-		if (q->size() == 0)
+		if (q->size == 0)
 			return;
 		auto t = q;
 		acquire_lock();
diff --git a/server/server.cpp b/server/server.cpp
index 5d948b2..e601019 100644
--- a/server/server.cpp
+++ b/server/server.cpp
@@ -217,8 +217,13 @@ int dll_main(int argc, char** argv, Context* cxt){
     cxt->cfg = cfg;
     cxt->n_buffers = cfg->n_buffers;
     cxt->sz_bufs = buf_szs;
-    cxt->alt_server = NULL;
-    
+    if (cfg->backend_type == BACKEND_MonetDB && cxt->alt_server == nullptr)
+    {
+        auto alt_server = new Server(cxt);
+        alt_server->exec("SELECT '**** WELCOME TO AQUERY++! ****';");
+        puts(*(const char**)(alt_server->getCol(0)));
+        cxt->alt_server = alt_server;
+    }
     while(cfg->running){
         ENGINE_ACQUIRE();
         if (cfg->new_query) {