Recycle bin LMT Vs Dictionary Managed

Question

Hi,
Am I right in thinking you only get a recycle bin for LMT's?
So any dictionary managed tablespaces will not have a recycle bin even if recyclebin is on for the database.
Thanks.

Answer 1

You're correct that DMTs cannot make use of the recyclebin functionality.
create tablespace hjr datafile 'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\hjr01.dbf' size 10m extent management dictionary;
create table t1 (col1 char(5)) tablespace hjr;
show recyclebin;
{nothing returned}
drop table t1;
show recyclebin;
{nothing returned}BUT...
create tablespace hjr2 datafile 'C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST\hjr201.dbf' size 10m extent management local;
create table t1 (col1 char(5)) tablespace hjr2;
show recyclebin;
{nothing returned}
drop table t1;
show recyclebin;
ORIGINAL NAME    RECYCLEBIN NAME                OBJECT TYPE  DROP TIME
T1               BIN$zq24aOXxRGitS2FnP8SUjQ==$0 TABLE        2008-01-07:22:09:02It comes down to the fact that the recyclebin isn't a separate place where tables are moved to, but simply a means of marking extents for over-writing without actually vacating them. In DMT, that would potentially mean updating lots of rows in the UET$ table, and that would be expensive. In LMT, you simply set lots of bits.
The recyclebin is simply not feasible in DMT, in other words.