Dropping all tables sqlplus

Question

Whenever I perform select * from tab; I get tables that i did not create. It looks like:

TNAME       TABTYPE  CLUSTERID
------------------------------ ------- ----------
BIN$GGrKjbVGTVaus4568IEhUQ==$0 TABLE
BIN$H+a0o3uyTTKTOA8WMkNltg==$0 TABLE
BIN$IUNyfOwkS0WSEVjbn04mNw==$0 TABLE
BIN$K/3NJw5zRXyRqPixL3tqDA==$0 TABLE
BIN$KQw9SejEToywXlHp18FMZA==$0 TABLE
BIN$MOEfgWgsS0GkC/CpYW+cxA==$0 TABLE
BIN$QkUYVciPQpWBwqBhxH+Few==$0 TABLE
BIN$QmtbaOYiTHCGEE0PRiLzmg==$0 TABLE
BIN$QxF4/JShTxu8PYIx8g/L7Q==$0 TABLE
BIN$UtEI7RbiQvOYzKqJEibwKQ==$0 TABLE
BIN$VMG0FXp2ROCKbedj3Ge9hg==$0 TABLE

I tried performing

select 'drop table '||table_name||' cascade constraints;' from user_tables; 

on spool and executing but those table were not selected. It just looks really messy and is bothering me a lot. What are they? Is there any way I can get rid of them ? Or do I have to just deal with it and work with it?

Answer 1

Posting as a comment for better visibility.. Credits to @Tomás for pointing me in the right direction.

I had to do purge recyclebin; instead of purge dba_recyclebin since I have insufficient privilege(I am a student logged in via ssh).

If you want to turn your recycle bin off, Use ALTER SESSION SET recyclebin = OFF;

Answer 2

Q What are they?

A Looks like tables that were dropped and preserved in the RECYCLEBIN.

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Q Is there any way I can get rid of them ?

A You can use e.g. PURGE TABLE BIN$GGrKjbVGTVaus4568IEhUQ==$0 ; to remove them.

That will do them individually. Note that indexes and LOBs (and other out-of-line storage) may also have entries in the recycle bin. There are other statements you can use to clear out all entries from the recycle bin.

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Q Or do I have to just deal with it and work with it?

A That's up to you.

There are statements to purge the recycle bin for the current user, or if you have privileges, for the entire database. You can also disable the recyclebin, or ( I think) there's an option on the DROP TABLE that will drop a table without keeping it in the recyclebin (so these won't be created in the future.)

There's no need for me to repeat the contents of the Oracle documentation.

Refer to: http://docs.oracle.com/cd/B28359_01/server.111/b28310/tables011.htm#ADMIN01511