See the recyclebin not shown anything once drop table
currently test flashback table, but I wonder why recycle bin does not show anything after release? I check the parameter and the value is enabled. now it has me thinking there at - it a link between re-use locker, retention of undo and undo SCT size?If so why it does not work on a undo_retention = 900, cancellation of TBS size = 100MB and the table that I dropped consisting of 1 single column and type of 3 lines data number, which is particularly small. is there something that I need to put more?
DB version is 10.2.0.1.0
Thank you!
mitchykoi wrote:
It is also possible that all SYS objects can be stored or seen in a recyclebin?
Only if the user Sys is store in a tablespace nonsystem as below,
SQL> conn / as sysdba
Connected.
SQL> create table test_rbin2(a char) tablespace users;
Table created.
SQL> select table_name, tablespace_name
2 from user_tables where table_name='TEST_RBIN2';
TABLE_NAME TABLESPACE_NAME
------------------------------ ------------------------------
TEST_RBIN2 USERS
SQL> show recyclebin
SQL> drop table test_rbin2
2 ;
Table dropped.
SQL> show recyclebin
ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME
---------------- ------------------------------ ------------ -------------------TEST_RBIN2 BIN$l/0nppCwhObgQL4KFEMjfA==$0 TABLE 2010-12-22:09:12:39SQL>
You can see that the table is now in the recyclbin. Its actually the tablespace that would govern this thing. System tablespace is special and its objects are special treaties as well. The Sys user is supposed to be the owner of the system default tablespace (it's too) so by default, any drop table made here would not go to recyclebin.
as a recyclebin for system objects only?
No, there is no such thing.
Also, what are the importance of the following: buffer_pool_recycle, db_recycle_cache_size for the garbage?
Db_recycle_cache_size actually has Nothing to do with the Recyclebin except that it shares a common word with the latest. Buffer_pool_recycle also has nothing to do with the Recyclebin and actually, it has nothing to do at all of 10.1, because it is an obsolete parameter and is replaced by, guess what, db_recycle_cache_size .
HTH
Aman...
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