SQL> explain plan for select count(1) from hxl.tb_objects;
explain plan for select count(1) from hxl.tb_objects
                        *
ERROR at line 1:
ORA-00604: error occurred at recursive SQL level 2
ORA-16000: database open for read-only access


SQL> select count(1) from hxl.tb_objects;

  COUNT(1)
----------
  22238018

SQL> select open_mode from v$database;

OPEN_MODE
----------
READ ONLY