 smaller formats, perform other data manipulations, or run
     reports.  The first form of the command requires an
     <code class="literal">ACCESS EXCLUSIVE</code> lock on the parent table.
     Adding the <code class="literal">CONCURRENTLY</code> qualifier as in the second
     form allows the detach operation to require only
     <code class="literal">SHARE UPDATE EXCLUSIVE</code> lock on the parent table, but see
     <a class="link" href="sql-altertable.html#SQL-ALTERTABLE-DETACH-PARTITION"><code cla