Submitted by: @pavel-zotov

Duplicates CORE304

C:\1INSTALL\FIREBIRD\FB25>isql -n TCHK.FDB -user sysdba -pas masterke
Database: TCHK.FDB, User: sysdba
SQL> create sequence gen_tns; commit;
SQL> create collation ns_coll for utf8 from unicode 'NUMERIC-SORT=1'; commit;
SQL> create user tu0 password 'tu0'; commit;
SQL> connect tchk.fdb user tu0 password tu0;
Database: tchk.fdb, User: tu0 ------------------- since that point we are connected without any rights
SQL> delete from rdb$generators where rdb$system_flag=0;
SQL> commit; -- passed! why ??
SQL> delete from rdb$collations where rdb$system_flag=0;
SQL> commit; -- passed! why ??
SQL> delete from rdb$triggers where rdb$system_flag=0;
SQL> commit; -- passed! why ??

SQL> update rdb$indices set rdb$index_inactive=3 where rdb$system_flag=0;
Statement failed, SQLSTATE = 28000
no permission for control access to TABLE TNS -- only that works Ok