With the DDL transaction number

Is it true you will get the error trying to execute DDL for some a table if there is an active transaction at this table? Take a look at this case:
insert into t1 values(1,2,3)
drop table t1
as you can see, I don't have "commited yet, if the T1 transaction is still active.

I tried to open a new session in SQL Developer just to confirm that the DML insert has not been committed yet
select * from t1
and Yes, it returns no rows.

I was expecting error, but the
drop table t1
did not produce an error. He successfully executed. Am I missing something? Thank you

You need to do the INSERTION and the FALL in two different sessions to generate an error (ORA-00054: resource busy and acquire with NOWAIT specified).

DDL performs an implicit validation before and after that the DDL is executed. If your DROP statement commits first INSERT then drops the table and finally delivers a further validation. That does not generate errors because by the time wherever the table is deleted, there is no active transaction. In addition, even if there is an active transaction, the you'll never erred waits for a lock that already has your session. Because locks are held by the session, various statements in the same session cannot block the other.

Justin

Tags: Database

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