LLL: serialized and schema objects...

I need in help:

let's say you have serialized transaction in one session...
Now, some other user drops a table that was in data base when
serialized transaction began but does it before this transaction
read table (first time)...

1. Will RDBMS allow to drop table? (And so abort
   serialized transaction if it tries read dropped
   table)
2. Or DROP TABLE will be blocked waiting when
   serialized transaction commits/aborts ?

Could someone test this in Oracle/Informix/Sybase ?

Vadim