more than one user may wondered who created those BIN$ when they first connected to a 10g database.
create table lsc_t(x number)
partition by range(x)
(partition LESS_THAN_ONE values less than (1));
drop table lsc_t;
select object_name, subobject_name, created
from user_objects
where object_name like 'BIN$%';
OBJECT_NAME SUBOBJECT_NAME CREATED
------------------------------ --------------- ---------
BIN$bh2VJ6FqFJ3gRAAUT+rFpg==$0 LESS_THAN_ONE 07-JUL-09
Ok, it is quite easy to get rid of it. Either at DROP time with a DROP TABLE LSC_T PURGE or later with PURGE RECYCLEBIN. Most of the objects disappear from USER_OBJECTS when dropped actually. The recyclebin view is called : RECYCLEBIN.
purge recyclebin;
select object_name, subobject_name, created
from user_objects
where object_name like 'BIN$%';
no rows selected.
select * from recyclebin;
no rows selected.
So far so good…
Let’s see what’s happening with my primary keys
purge recyclebin;
create table lsc_t(x number constraint lsc_t_pk primary key);
drop table lsc_t;
select object_name, original_name, type from recyclebin;
OBJECT_NAME ORIGINAL_NAME TYPE
------------------------------ ------------- -----
BIN$bh23ggtBHALgRAAUT+rFpg==$0 LSC_T TABLE
BIN$bh23ggtAHALgRAAUT+rFpg==$0 LSC_T_PK INDEX
The primary key index is now in the recycle bin as well.
let’s recover the recycle bin version :
flashback table lsc_t to before drop;
select index_name from user_indexes where table_name='LSC_T';
INDEX_NAME
------------------------------
BIN$bh3GgNi1HR3gRAAUT+rFpg==$0
select object_name, original_name, type from recyclebin;
no rows selected.
đź‘ż
So if you cannot exclude BIN$ objects from your dba maintenance scripts, you will need to deal with thoses as they may be recovered indexes!
Hi Laurent. Interesting article
I’ve even used DBMS_METADATA.GET_DDL to find out somehow the “real name” of that index, but it gave only BIN$ name 🙂
It’s very interesting, why it doesn’t “rename” automatically that index to its original name :S
Thanks for sharing Laurent!
“It’s very interesting, why it doesn’t “rename” automatically that index to its original name”
I think, because someone could create index with the same name while the index is in recycle bin..
you could also do create table t; drop table t; create table t; drop table t; flashback table t to before drop rename to t1; flashback table t to before drop rename to t2; flashback table t to before drop rename to t3;
However I do not like BIN$ index.
I would prefer a SYS_ generated name
select index_name, generated from user_indexes where index_name like 'BIN$%';
INDEX_NAME GENERATED
------------------------------ ---------
BIN$biz/RM1lE4XgRAAUT+rFpg==$0 N
I would prefer SYS_001234567;Y for an index…