Extra-Tables

Question

Dear all,
With 11GR1, I have created two tables ,but with these two here one can see two strange table name in TAB not in USER_TABLES.
SQL> select tname from tab;
TNAME
BIN$ApqPvBz0RHqsrBNGmJNXSA==$0
BIN$Wgrvtsv2RJSOQgSEkp0hdw==$0
TEST1
TEST2
SQL> select table_name from user_tables;
TABLE_NAME
TEST1
TEST2
SQL> desc tab
Name Null? Type
TNAME NOT NULL VARCHAR2(30)
TABTYPE VARCHAR2(7)
CLUSTERID NUMBER
SQL> select tname,tabtype from tab;
TNAME TABTYPE
BIN$ApqPvBz0RHqsrBNGmJNXSA==$0 TABLE
BIN$Wgrvtsv2RJSOQgSEkp0hdw==$0 TABLE
TEST1 TABLE
TEST2 TABLE
SQL> desc BIN$ApqPvBz0RHqsrBNGmJNXSA==$0
SP2-0565: Illegal identifier.
SQL> select * from BIN$ApqPvBz0RHqsrBNGmJNXSA==$0
2 ;
select * from BIN$ApqPvBz0RHqsrBNGmJNXSA==$0
ERROR at line 1:
ORA-00933: SQL command not properly ended
Is it a BUG ?
:-)

Answer 1

Those tables are in the recycle bin. By default, when you DROP table, Oracle just moves it to the recycle bin in 10g and later. That allows you to undrop the table at some point in the future.
You can prevent that by adding the PURGE command when you drop a table, i.e.
DROP TABLE table_name PURGEor by disabling the recycle bin. You can also clean out the recycle bin
PURGE dba_recyclebin;or
PURGE user_recyclebinJustin