ط®ط§طµظٹظ‡ Flashback Versions Query, ط¨ط¹ط¶ ط§ظ„ظ…ظ…ظٹط²ط§طھ ط§ظ„ط¬ط¯ظٹط¯ظ‡ ظپظٹOracle DB 10g