IIRC this is a known bug. Just go back to 9i view definition or change
the all_objects view definition with /*+RULE */ hint.

K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/

Author: Oracle Database 10g RAC Handbook, Oracle Press 2006
http://www.amazon.com/gp/product/007146509X/


can arrive by kaygopal AT gmail.com

>     ## Test Env.
>
>     ##  MS Windows
>
>     ##  Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 -
Prod
>
>           PL/SQL Release 10.2.0.1.0 - Production
>
> CORE    10.2.0.1.0      Production
>
> TNS for 32-bit Windows: Version 10.2.0.1.0 - Production
>
> NLSRTL Version 10.2.0.1.0 - Production
>
>
>
>
>
>    select distinct owner from sys.all_objects;  consume 100%
CPU,hanging.
>
>
>
>     If  I run with Rule ,it returns the rows.
>
>
>
>     Statistics is there on SYS tables.
>
>
>
>     Explain plan show HASH JOIN between sys.user$ and sys.obj$ if it
runs
> without Rule hint.
>

--------------definition of all_objects---------------------------------------
select u.name, o.name, o.subname, o.obj#, o.dataobj#,
       decode(o.type#, 0, 'NEXT OBJECT', 1, 'INDEX', 2, 'TABLE', 3, 'CLUSTER',
                      4, 'VIEW', 5, 'SYNONYM', 6, 'SEQUENCE',
                      7, 'PROCEDURE', 8, 'FUNCTION', 9, 'PACKAGE',
                      11, 'PACKAGE BODY', 12, 'TRIGGER',
                      13, 'TYPE', 14, 'TYPE BODY',
                      19, 'TABLE PARTITION', 20, 'INDEX PARTITION', 21, 'LOB',
                      22, 'LIBRARY', 23, 'DIRECTORY', 24, 'QUEUE',
                      28, 'JAVA SOURCE', 29, 'JAVA CLASS', 30, 'JAVA RESOURCE',
                      32, 'INDEXTYPE', 33, 'OPERATOR',
                      34, 'TABLE SUBPARTITION', 35, 'INDEX SUBPARTITION',
                      40, 'LOB PARTITION', 41, 'LOB SUBPARTITION',
                      42, NVL((SELECT distinct 'REWRITE EQUIVALENCE'
                               FROM sum$ s
                               WHERE s.obj#=o.obj#
                                     and bitand(s.xpflags, 8388608) = 8388608),
                              'MATERIALIZED VIEW'),
                      43, 'DIMENSION',
                      44, 'CONTEXT', 46, 'RULE SET', 47, 'RESOURCE PLAN',
                      48, 'CONSUMER GROUP',
                      55, 'XML SCHEMA', 56, 'JAVA DATA',
                      57, 'SECURITY PROFILE', 59, 'RULE',
                      60, 'CAPTURE', 61, 'APPLY',
                      62, 'EVALUATION CONTEXT',
                      66, 'JOB', 67, 'PROGRAM', 68, 'JOB CLASS', 69, 'WINDOW',
                      72, 'WINDOW GROUP', 74, 'SCHEDULE', 79, 'CHAIN',
                      81, 'FILE GROUP',
                     'UNDEFINED'),
       o.ctime, o.mtime,
       to_char(o.stime, 'YYYY-MM-DD:HH24:MI:SS'),
       decode(o.status, 0, 'N/A', 1, 'VALID', 'INVALID'),
       decode(bitand(o.flags, 2), 0, 'N', 2, 'Y', 'N'),
       decode(bitand(o.flags, 4), 0, 'N', 4, 'Y', 'N'),
       decode(bitand(o.flags, 16), 0, 'N', 16, 'Y', 'N')
from sys.obj$ o, sys.user$ u
where o.owner# = u.user#
  and o.linkname is null
  and (o.type# not in (1  /* INDEX - handled below */,
                      10 /* NON-EXISTENT */)
       or
       (o.type# = 1 and 1 = (select 1
                             from sys.ind$ i
                            where i.obj# = o.obj#
                              and i.type# in (1, 2, 3, 4, 6, 7, 9))))
  and o.name != '_NEXT_OBJECT'
  and o.name != '_default_auditing_options_'
  and
  (
    o.owner# in (userenv('SCHEMAID'), 1 /* PUBLIC */)
    or
    (
      /* EXECUTE privilege does not let user see package/type body */
      o.type# != 11 and o.type# != 14
      and
      o.obj# in (select obj# from sys.objauth$
                 where grantee# in (select kzsrorol from x$kzsro)
                   and privilege# in (3 /* DELETE */,   6 /* INSERT */,
                                      7 /* LOCK */,     9 /* SELECT */,
                                      10 /* UPDATE */, 12 /* EXECUTE */,
                                      11 /* USAGE */,  16 /* CREATE */,
                                      17 /* READ */,   18 /* WRITE  */ ))
    )
    or
    (
       o.type# in (7, 8, 9, 28, 29, 30, 56) /* prc, fcn, pkg */
       and
       exists (select null from v$enabledprivs
               where priv_number in (
                                      -144 /* EXECUTE ANY PROCEDURE */,
                                      -141 /* CREATE ANY PROCEDURE */
                                    )
              )
    )
    or
    (
       o.type# in (12) /* trigger */
       and
       exists (select null from v$enabledprivs
               where priv_number in (
                                      -152 /* CREATE ANY TRIGGER */
                                    )
              )
    )
    or
    (
       o.type# = 11 /* pkg body */
       and
       exists (select null from v$enabledprivs
               where priv_number =   -141 /* CREATE ANY PROCEDURE */
              )
    )
    or
    (
       o.type# in (22) /* library */
       and
       exists (select null from v$enabledprivs
               where priv_number in (
                                      -189 /* CREATE ANY LIBRARY */,
                                      -190 /* ALTER ANY LIBRARY */,
                                      -191 /* DROP ANY LIBRARY */,
                                      -192 /* EXECUTE ANY LIBRARY */
                                    )
              )
    )
    or
    (
       /* index, table, view, synonym, table partn, indx partn, */
       /* table subpartn, index subpartn, cluster               */
       o.type# in (1, 2, 3, 4, 5, 19, 20, 34, 35)
       and
       exists (select null from v$enabledprivs
               where priv_number in (-45 /* LOCK ANY TABLE */,
                                     -47 /* SELECT ANY TABLE */,
                                     -48 /* INSERT ANY TABLE */,
                                     -49 /* UPDATE ANY TABLE */,
                                     -50 /* DELETE ANY TABLE */)
               )
    )
    or
    ( o.type# = 6 /* sequence */
      and
      exists (select null from v$enabledprivs
              where priv_number = -109 /* SELECT ANY SEQUENCE */)
    )
    or
    ( o.type# = 13 /* type */
      and
      exists (select null from v$enabledprivs
              where priv_number in (-184 /* EXECUTE ANY TYPE */,
                                    -181 /* CREATE ANY TYPE */))
    )
    or
    (
      o.type# = 14 /* type body */
      and
      exists (select null from v$enabledprivs
              where priv_number = -181 /* CREATE ANY TYPE */)
    )
    or
    (
       o.type# = 23 /* directory */
       and
       exists (select null from v$enabledprivs
               where priv_number in (
                                      -177 /* CREATE ANY DIRECTORY */,
                                      -178 /* DROP ANY DIRECTORY */
                                    )
              )
    )
    or
    (
       o.type# = 42 /* summary jjf table privs have to change to summary */
       and
         exists (select null from v$enabledprivs
                 where priv_number in (-45 /* LOCK ANY TABLE */,
                                       -47 /* SELECT ANY TABLE */,
                                       -48 /* INSERT ANY TABLE */,
                                       -49 /* UPDATE ANY TABLE */,
                                       -50 /* DELETE ANY TABLE */)
                 )
    )
    or
    (
      o.type# = 32   /* indextype */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -205  /* CREATE INDEXTYPE */ ,
                                      -206  /* CREATE ANY INDEXTYPE */ ,
                                      -207  /* ALTER ANY INDEXTYPE */ ,
                                      -208  /* DROP ANY INDEXTYPE */
                                    )
             )
    )
    or
    (
      o.type# = 33   /* operator */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -200  /* CREATE OPERATOR */ ,
                                      -201  /* CREATE ANY OPERATOR */ ,
                                      -202  /* ALTER ANY OPERATOR */ ,
                                      -203  /* DROP ANY OPERATOR */ ,
                                      -204  /* EXECUTE OPERATOR */
                                    )
             )
    )
    or
    (
      o.type# = 44   /* context */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -222  /* CREATE ANY CONTEXT */,
                                      -223  /* DROP ANY CONTEXT */
                                    )
             )
    )
    or
    (
      o.type# = 48  /* resource consumer group */
      and
      exists (select null from v$enabledprivs
              where priv_number in (12)  /* switch consumer group privilege */
             )
    )
    or
    (
      o.type# = 46 /* rule set */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -251, /* create any rule set */
                                      -252, /* alter any rule set */
                                      -253, /* drop any rule set */
                                      -254  /* execute any rule set */
                                    )
             )
    )
    or
    (
      o.type# = 55 /* XML schema */
      and
      1 = (select /*+ NO_MERGE */ xml_schema_name_present.is_schema_present(o.na
me, u2.id2) id1 from (select /*+ NO_MERGE */ userenv('SCHEMAID') id2 from dual)
u2)
      /* we need a sub-query instead of the directy invoking
       * xml_schema_name_present, because inside a view even the function
       * arguments are evaluated as definers rights.
       */
    )
    or
    (
      o.type# = 59 /* rule */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -258, /* create any rule */
                                      -259, /* alter any rule */
                                      -260, /* drop any rule */
                                      -261  /* execute any rule */
                                    )
             )
    )
    or
    (
      o.type# = 62 /* evaluation context */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -246, /* create any evaluation context */
                                      -247, /* alter any evaluation context */
                                      -248, /* drop any evaluation context */
                                      -249 /* execute any evaluation context */
                                    )
             )
    )
    or
    (
      o.type# = 66 /* scheduler job */
      and
      exists (select null from v$enabledprivs
               where priv_number = -265 /* create any job */
             )
    )
    or
    (
      o.type# IN (67, 79) /* scheduler program or chain */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -265, /* create any job */
                                      -266 /* execute any program */
                                    )
             )
    )
    or
    (
      o.type# = 68 /* scheduler job class */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                      -268, /* manage scheduler */
                                      -267 /* execute any class */
                                    )
             )
    )
    or (o.type# in (69, 72, 74))
    /* scheduler windows, window groups and schedules */
    /* no privileges are needed to view these objects */
    or
    (
      o.type# = 81 /* file group */
      and
      exists (select null from v$enabledprivs
               where priv_number in (
                                       -277, /* manage any file group */
                                       -278  /* read any file group */
                                    )
             )
    )
  )
-------------------------end-----------------------------------------------