diff --git a/src/backends/redis/backend_redis.cpp b/src/backends/redis/backend_redis.cpp
index 555337e..720cce6 100644
--- a/src/backends/redis/backend_redis.cpp
+++ b/src/backends/redis/backend_redis.cpp
@@ -167,6 +167,7 @@ namespace dindb {
 
 		const auto group_id = lexical_cast<std::string>(group_id_int);
 		const std::string set_key = PROGRAM_NAME ":set:" + group_id;
+		const std::string level_key = PROGRAM_NAME ":levels:" + group_id;
 		assert(file_id_int >= data_size);
 		const auto base_file_id = file_id_int - data_size + 1;
 
@@ -215,6 +216,8 @@ namespace dindb {
 				PROGRAM_NAME ":hash:" + hash,
 				lexical_cast<std::string>(z)
 			);
+
+			batch.zadd(level_key, redis::IncRedisBatch::ZADD_None, false, static_cast<double>(file_data.level), file_key);
 #if !defined(NDEBUG)
 			++inserted_count;
 #endif
@@ -275,7 +278,7 @@ namespace dindb {
 	}
 
 	std::vector<dinhelp::MaxSizedArray<std::string, 1>> BackendRedis::find_file_details (GroupIDType parSetID, uint16_t parLevel, boost::string_ref parDir) {
-		return std::vector<dinhelp::MaxSizedArray<std::string, 1>>();
+		return dindb::find_file_details(m_redis, parSetID, parLevel, parDir);
 	}
 
 	std::vector<std::string> BackendRedis::find_paths_starting_by (GroupIDType parGroupID, uint16_t parLevel, boost::string_ref parPath) {
diff --git a/src/backends/redis/delete.cpp b/src/backends/redis/delete.cpp
index fb612e1..b7711d5 100644
--- a/src/backends/redis/delete.cpp
+++ b/src/backends/redis/delete.cpp
@@ -144,6 +144,7 @@ namespace dindb {
 			}
 
 			dele_batch.del(PROGRAM_NAME ":set:" + lexical_cast<std::string>(set_id));
+			dele_batch.del(PROGRAM_NAME ":levels:" + lexical_cast<std::string>(set_id));
 			chunked_run<FileIDType, 8>(dele_batch.batch(), +"DEL", file_base_index, file_count, [](FileIDType id){return PROGRAM_NAME ":file:" + lexical_cast<std::string>(id);});
 		}
 
diff --git a/src/backends/redis/find.cpp b/src/backends/redis/find.cpp
index 737988a..16f1405 100644
--- a/src/backends/redis/find.cpp
+++ b/src/backends/redis/find.cpp
@@ -31,6 +31,7 @@
 #include <functional>
 #include <iterator>
 #include <cstdint>
+#include <boost/algorithm/string/predicate.hpp>
 
 namespace dindb {
 	namespace {
@@ -261,7 +262,6 @@ namespace dindb {
 
 	std::vector<dinhelp::MaxSizedArray<std::string, 4>> find_set_details (redis::IncRedis& parRedis, const std::vector<GroupIDType>& parSets) {
 		using dinhelp::lexical_cast;
-		using MArr = dinhelp::MaxSizedArray<std::string, 4>;
 
 		auto batch = parRedis.make_batch();
 		for (auto set_id : parSets) {
@@ -270,7 +270,7 @@ namespace dindb {
 		}
 		batch.throw_if_failed();
 
-		std::vector<MArr> retval;
+		std::vector<dinhelp::MaxSizedArray<std::string, 4>> retval;
 		auto curr_set = parSets.begin();
 		for (const auto& reply : batch.replies()) {
 			const auto& reply_list = get_array(reply);
@@ -288,4 +288,33 @@ namespace dindb {
 		}
 		return retval;
 	};
+
+	std::vector<dinhelp::MaxSizedArray<std::string, 1>> find_file_details (redis::IncRedis& parRedis, GroupIDType parSetID, uint16_t parLevel, boost::string_ref parDir) {
+		using dinhelp::lexical_cast;
+		using RetListType = std::vector<dinhelp::MaxSizedArray<std::string, 1>>;
+
+		const double level = static_cast<float>(parLevel);
+		auto lst = parRedis.zrangebyscore(PROGRAM_NAME ":levels:" + lexical_cast<std::string>(parSetID), level, true, level, true, false);
+		if (not lst)
+			return RetListType();
+
+		auto batch = parRedis.make_batch();
+		for (const auto& itm : *lst) {
+			if (itm)
+				batch.hget(*itm, "path");
+		}
+		batch.throw_if_failed();
+
+		std::vector<dinhelp::MaxSizedArray<std::string, 1>> retval;
+		for (auto& reply : batch.replies()) {
+			if (redis::RedisVariantType_Nil != reply.which()) {
+				auto curr_path = get_string(reply);
+				if (boost::starts_with(curr_path, parDir)) {
+					retval.resize(retval.size() + 1);
+					retval.back().push_back(std::move(curr_path));
+				}
+			}
+		}
+		return retval;
+	};
 } //namespace dindb
diff --git a/src/backends/redis/find.hpp b/src/backends/redis/find.hpp
index b31b64d..d06395d 100644
--- a/src/backends/redis/find.hpp
+++ b/src/backends/redis/find.hpp
@@ -33,6 +33,7 @@ namespace dindb {
 	std::vector<LocatedSet> locate_sets_in_db ( redis::IncRedis& parRedis, const std::string& parSubstr, bool parCaseInsensitive );
 	std::vector<LocatedSet> locate_sets_in_db ( redis::IncRedis& parRedis, const std::string& parSubstr, const std::vector<GroupIDType>& parSets, bool parCaseInsensitive );
 	std::vector<dinhelp::MaxSizedArray<std::string, 4>> find_set_details ( redis::IncRedis& parRedis, const std::vector<GroupIDType>& parSets );
+	std::vector<dinhelp::MaxSizedArray<std::string, 1>> find_file_details ( redis::IncRedis& parRedis, GroupIDType parSetID, uint16_t parLevel, boost::string_ref parDir );
 } //namespace dindb
 
 #endif