Hi, I found a strange problem in a database under Oracle Database 11g Release 11.2.0.1.0 - 64bit Production. I searched a lot on the net but I couldn't find a solution for it. After I create a table and I try to drop it, I receive the following error message: ORA-00604: error occurred at recursive SQL level 1 ORA-02264: name already used by an existing constraint The table has the structure as below. It also contains more other columns but they don't have any constraint defined and I don't know why such an error appears after drop table. I found some messages on the net telling that this issue appears because of recyclebin (because the constraints get dupplicated in recyclebin) and the suggestion to use `purge recyclebin` but when I give this command it gives the following error which is even more strange: ORA-00600: internal error code, arguments: [16500], [kqdcru], [D], [2], [91], [BIN$jMPhYuTGVJvgQDIKGRwO+w==$0], [], [], [], [], [], [] I have also tried to do `delete from recyclebin` but it gives the error "ORA-01031: insufficient privileges" I was able to delete those tables by loging with the sys account as sysdba, but I don't know why I can't drop a table after I created it using my username. Here is the table structure. I verified and the constraints used in this table are not used somewhere else. The strange thing is that I succeeded to drop the table first time using my username, but after re-creating it, I wasn't able to drop it anymore, because it gave that error. Please help! create table bilant_fonduri( id integer constraint bilant_fonduri_pk primary key, symbol varchar2(20) constraint bilant_fonduri_symbol_nn not null, last_update date default sysdate, year integer constraint bilant_fonduri_year_nn not null, trim integer constraint bilant_fonduri_trim_nn not null constraint bilant_fonduri_trim_c check(trim in('1','2','3','4')), data_publicare date, valoare_nominala_emitere number(12,4), valoare_nominala_publicare number(12,4), nr_actiuni_emitere integer, nr_actiuni_publicare integer, pret_emitere number(12,4), pret_publicare number(12,4), active number(1) default 0, constraint bilant_fonduri_sym_y_t_u unique(symbol, year, trim), ... ); Thank you. --Octavian