The default name of an AVL is now the column name + '_indexer', and when

an AVL is opened (as opposed to created), it is read-only

src/obiavl.h

@@ -167,6 +167,8 @@ typedef struct OBIDMS_avl_group {
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 */
 	OBIDMS_p        dms;									/**< Pointer to the OBIDMS structure to which the AVL group belongs.
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 */
+	bool			writable;								/**< Indicates whether the AVL group is read-only or not.
+															 */
 	size_t			counter;								/**< Indicates by how many threads/programs (TODO) the AVL group is used.
 													 	 	 */
 } OBIDMS_avl_group_t, *OBIDMS_avl_group_p;