Lock table and disallow select

Query from user. can the following be done in PL/SQL?

> I need to be able to lock a table in such a way that not only can no other
> session alter any records in the table, but they cannot read the table at
> all (i.e. do SELECTs on it) until I'm done with it.
>
> Any SELECT statements would pause until I release the lock.
>
> Is such a thing possible?

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Author: John Dunn
  INET: john.dunn_at_sefas.co.uk

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