e target version can end with an '*', indicating whatever tip version that
 matches the target prefix. This method protects itself against SIGTERMs (CTRL-C).
<P>
<DD><DL>
</DL>
</DD>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>target</CODE> - The target requested.<DD><CODE>downgradeable</CODE> - Indicates that downgrade paths are allowed to reach the given target.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../solidbase/core/SQLExecutionException.html" title="class in solidbase.core">SQLExecutionException