diff --git a/mdbx.c b/mdbx.c
index 3628072c..81e82a6d 100644
--- a/mdbx.c
+++ b/mdbx.c
@@ -930,8 +930,6 @@ typedef struct MDB_dbx {
   MDB_val md_name;       /**< name of the database */
   MDB_cmp_func *md_cmp;  /**< function for comparing keys */
   MDB_cmp_func *md_dcmp; /**< function for comparing data items */
-  MDB_rel_func *md_rel;  /**< user relocate function */
-  void *md_relctx;       /**< user-provided context for md_rel */
 } MDB_dbx;
 
 #if MDBX_MODE_ENABLED
@@ -7723,7 +7721,6 @@ static void mdbx_xcursor_init0(MDB_cursor *mc) {
   mx->mx_dbx.md_name.mv_data = NULL;
   mx->mx_dbx.md_cmp = mc->mc_dbx->md_dcmp;
   mx->mx_dbx.md_dcmp = NULL;
-  mx->mx_dbx.md_rel = mc->mc_dbx->md_rel;
 }
 
 /** Final setup of a sorted-dups cursor.
@@ -10102,7 +10099,6 @@ int mdbx_dbi_open(MDB_txn *txn, const char *name, unsigned flags,
     unsigned slot = unused ? unused : txn->mt_numdbs;
     txn->mt_dbxs[slot].md_name.mv_data = namedup;
     txn->mt_dbxs[slot].md_name.mv_size = len;
-    txn->mt_dbxs[slot].md_rel = NULL;
     txn->mt_dbflags[slot] = dbflag;
     /* txn-> and env-> are the same in read txns, use
      * tmp variable to avoid undefined assignment
@@ -10354,34 +10350,6 @@ int mdbx_set_dupsort(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp) {
   return MDB_SUCCESS;
 }
 
-int mdbx_set_relfunc(MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel) {
-  if (unlikely(!txn))
-    return EINVAL;
-
-  if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE))
-    return MDB_VERSION_MISMATCH;
-
-  if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID)))
-    return EINVAL;
-
-  txn->mt_dbxs[dbi].md_rel = rel;
-  return MDB_SUCCESS;
-}
-
-int mdbx_set_relctx(MDB_txn *txn, MDB_dbi dbi, void *ctx) {
-  if (unlikely(!txn))
-    return EINVAL;
-
-  if (unlikely(txn->mt_signature != MDBX_MT_SIGNATURE))
-    return MDB_VERSION_MISMATCH;
-
-  if (unlikely(!TXN_DBI_EXIST(txn, dbi, DB_USRVALID)))
-    return EINVAL;
-
-  txn->mt_dbxs[dbi].md_relctx = ctx;
-  return MDB_SUCCESS;
-}
-
 int __cold mdbx_env_get_maxkeysize(MDB_env *env) {
   if (!env || env->me_signature != MDBX_ME_SIGNATURE)
     return EINVAL;
diff --git a/mdbx.h b/mdbx.h
index b86136a4..2b3a8a8a 100644
--- a/mdbx.h
+++ b/mdbx.h
@@ -117,25 +117,6 @@ typedef struct iovec MDB_val;
 /** @brief A callback function used to compare two keys in a database */
 typedef int(MDB_cmp_func)(const MDB_val *a, const MDB_val *b);
 
-/** @brief A callback function used to relocate a position-dependent data item
- * in a fixed-address database.
- *
- * The \b newptr gives the item's desired address in
- * the memory map, and \b oldptr gives its previous address. The item's actual
- * data resides at the address in \b item.  This callback is expected to walk
- * through the fields of the record in \b item and modify any
- * values based at the \b oldptr address to be relative to the \b newptr
- * address.
- * @param[in,out] item The item that is to be relocated.
- * @param[in] oldptr The previous address.
- * @param[in] newptr The new address to relocate to.
- * @param[in] relctx An application-provided context, set by
- * #mdbx_set_relctx().
- * @todo This feature is currently unimplemented.
- */
-typedef void(MDB_rel_func)(MDB_val *item, void *oldptr, void *newptr,
-                           void *relctx);
-
 /** @defgroup	mdbx_env	Environment Flags
  *	@{
  */
@@ -1243,44 +1224,6 @@ int mdbx_set_compare(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp);
  */
 int mdbx_set_dupsort(MDB_txn *txn, MDB_dbi dbi, MDB_cmp_func *cmp);
 
-/** @brief Set a relocation function for a #MDB_FIXEDMAP database.
- *
- * @todo The relocation function is called whenever it is necessary to move
- *the data
- * of an item to a different position in the database (e.g. through tree
- * balancing operations, shifts as a result of adds or deletes, etc.). It is
- * intended to allow address/position-dependent data items to be stored in
- * a database in an environment opened with the #MDB_FIXEDMAP option.
- * Currently the relocation feature is unimplemented and setting
- * this function has no effect.
- * @param[in] txn A transaction handle returned by #mdbx_txn_begin()
- * @param[in] dbi A database handle returned by #mdbx_dbi_open()
- * @param[in] rel A #MDB_rel_func function
- * @return A non-zero error value on failure and 0 on success. Some possible
- * errors are:
- * <ul>
- *	<li>EINVAL - an invalid parameter was specified.
- * </ul>
- */
-int mdbx_set_relfunc(MDB_txn *txn, MDB_dbi dbi, MDB_rel_func *rel);
-
-/** @brief Set a context pointer for a #MDB_FIXEDMAP database's relocation
- *function.
- *
- * See #mdbx_set_relfunc and #MDB_rel_func for more details.
- * @param[in] txn A transaction handle returned by #mdbx_txn_begin()
- * @param[in] dbi A database handle returned by #mdbx_dbi_open()
- * @param[in] ctx An arbitrary pointer for whatever the application needs.
- * It will be passed to the callback function set by #mdbx_set_relfunc
- * as its \b relctx parameter whenever the callback is invoked.
- * @return A non-zero error value on failure and 0 on success. Some possible
- * errors are:
- * <ul>
- *	<li>EINVAL - an invalid parameter was specified.
- * </ul>
- */
-int mdbx_set_relctx(MDB_txn *txn, MDB_dbi dbi, void *ctx);
-
 /** @brief Get items from a database.
  *
  * This function retrieves key/data pairs from the database. The address