Oracle-L: why these tables can not be seen from user

From: gmei <gmei_at_incyte.com>
Date: Tue, 04 Feb 2003 07:24:22 -0800
Message-ID: <F001.00543157.20030204072422@fatcity.com>

Hi:

Oracle 8173 on Sun Box.

SQL> select count(*) from user_tables;

COUNT(*)

326

SQL> select count(*) from user_segments where segment_type='TABLE';

COUNT(*)

318

SQL> select segment_name from user_segments   2 where segment_type='TABLE'
  3 and segment_name like 'DR$%'
  4 order by segment_name;

SEGMENT_NAME

DR$ABSTRACT_TEXT$I
DR$ABSTRACT_TEXT$R
DR$COREREF_ABSTRACT$I
DR$COREREF_ABSTRACT$R
DR$COREREF_TITLE$I
DR$COREREF_TITLE$R
DR$TEST_CONTEXT$I
DR$TEST_CONTEXT$R

8 rows selected.

SQL> select table_name from user_tables 2 where table_name like 'DR$%'
3 order by table_name;

TABLE_NAME

DR$ABSTRACT_TEXT$I
DR$ABSTRACT_TEXT$K
DR$ABSTRACT_TEXT$N
DR$ABSTRACT_TEXT$R
DR$COREREF_ABSTRACT$I
DR$COREREF_ABSTRACT$K
DR$COREREF_ABSTRACT$N
DR$COREREF_ABSTRACT$R
DR$COREREF_TITLE$I
DR$COREREF_TITLE$K
DR$COREREF_TITLE$N

TABLE_NAME

DR$COREREF_TITLE$R
DR$TEST_CONTEXT$I
DR$TEST_CONTEXT$K
DR$TEST_CONTEXT$N
DR$TEST_CONTEXT$R

16 rows selected.

Why tables like DR$ABSTRACT_TEXT$K, DR$ABSTRACT_TEXT$N do not have their corresponding segments? What are they and their functions?

TIA. Guang Mei

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Author: gmei
INET: gmei_at_incyte.com

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why these tables can not be seen from user_segments?