final long getGCPos(int oid) {
		Page pg = pool.getPage(header.root[currIndex].index
				+ ((long) (oid >>> dbHandlesPerPageBits) << Page.pageSizeLog));
		long pos = Bytes.unpack8(pg.data, (oid & (dbHandlesPerPage - 1)) << 3);

		pool.unfix(pg);
		return pos;
	}