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diff --git a/src/libknot/db/db_lmdb.h b/src/libknot/db/db_lmdb.h
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+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+/*!
+ * \file
+ *
+ * \addtogroup db
+ * @{
+ */
+
+#pragma once
+
+#include "libknot/db/db.h"
+
+/* Defines. */
+#define KNOT_DB_LMDB_MAPSIZE (100 * 1024 * 1024)
+
+/* LMDB specific flags. */
+extern const unsigned KNOT_DB_LMDB_NOTLS;
+extern const unsigned KNOT_DB_LMDB_RDONLY;
+extern const unsigned KNOT_DB_LMDB_INTEGERKEY;
+extern const unsigned KNOT_DB_LMDB_NOSYNC;
+extern const unsigned KNOT_DB_LMDB_WRITEMAP;
+extern const unsigned KNOT_DB_LMDB_MAPASYNC;
+extern const unsigned KNOT_DB_LMDB_DUPSORT;
+
+/* Native options. */
+struct knot_db_lmdb_opts {
+ const char *path; /*!< Database environment path. */
+ const char *dbname; /*!< Database name (or NULL). */
+ size_t mapsize; /*!< Environment map size. */
+ unsigned maxdbs; /*!< Maximum number of databases in the env. */
+ unsigned maxreaders; /*!< Maximum number of concurrent readers */
+ struct {
+ unsigned env; /*!< Environment flags. */
+ unsigned db; /*!< Database flags. */
+ } flags;
+};
+
+/* Default options. */
+#define KNOT_DB_LMDB_OPTS_INITIALIZER { \
+ NULL, NULL, \
+ KNOT_DB_LMDB_MAPSIZE, \
+ 0, \
+ 126, /* = contrib/lmdb/mdb.c DEFAULT_READERS */ \
+ { 0, 0 } \
+}
+
+const knot_db_api_t *knot_db_lmdb_api(void);
+
+/* LMDB specific operations. */
+int knot_db_lmdb_del_exact(knot_db_txn_t *txn, knot_db_val_t *key, knot_db_val_t *val);
+int knot_db_lmdb_txn_begin(knot_db_t *db, knot_db_txn_t *txn, knot_db_txn_t *parent,
+ unsigned flags);
+int knot_db_lmdb_iter_del(knot_db_iter_t *iter);
+size_t knot_db_lmdb_get_mapsize(knot_db_t *db);
+size_t knot_db_lmdb_get_usage(knot_db_t *db);
+
+/*! @} */