added a madvise for record tables

include/database.hpp

@@ -87,6 +87,8 @@ public:
 		
 		tmp.clear();
 
+		ret.records.enforce_caching();
+
 		#pragma GCC diagnostic push
 		#pragma GCC diagnostic ignored "-Wreturn-local-addr"
 		return std::move(ret);

include/fsized_map.h

@@ -157,6 +157,10 @@ class mmap_array : public mmap_ptr
 		posix_madvise(this->start, mapping_size, map_access);
 	}
 
+	void enforce_caching() {
+		posix_madvise(this->start, mapping_size, MADV_WILLNEED);
+	}
+
 	constexpr size_t size() {
 		return item_size;
 	}