{"id":47,"date":"2010-12-28T15:59:25","date_gmt":"2010-12-28T07:59:25","guid":{"rendered":"http:\/\/www.royalwzy.com\/?p=47"},"modified":"2013-12-30T10:58:19","modified_gmt":"2013-12-30T02:58:19","slug":"oracle-flashback-%e9%97%aa%e5%9b%9e%e6%9f%a5%e8%af%a2%e5%8a%9f%e8%83%bd9i%e5%92%8c10g%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"http:\/\/www.royalwzy.com\/?p=47","title":{"rendered":"Oracle Flashback \u95ea\u56de\u67e5\u8be2\u529f\u80fd9i\u548c10g\u7684\u533a\u522b"},"content":{"rendered":"

Oracle<\/span>\u4ece<\/span>9i<\/span>\u5f00\u59cb\u63d0\u4f9b\u4e86\u57fa\u4e8e\u56de\u6eda\u6bb5\u7684\u95ea\u56de\u67e5\u8be2<\/span>(Flashback Query)<\/span>\u529f\u80fd<\/span>,<\/span>\u53ef\u7528\u4e8e\u6062\u590d\u9519\u8bef\u7684<\/span>DML<\/span>\u64cd\u4f5c<\/span>.<\/span>\u5728<\/span>Oracle 10g<\/span>\u4e2d\u5bf9\u95ea\u56de\u67e5\u8be2\u505a\u4e86\u8f83\u5927\u6539\u8fdb<\/span>,<\/span>\u4e0d\u518d\u5c40\u9650\u4e8e\u95ea\u56de\u67e5\u8be2<\/span>,<\/span>\u8fd8\u53ef\u7528\u4e8e\u6062\u590d\u9519\u8bef\u7684<\/span>DDL(Drop)<\/span>\u64cd\u4f5c<\/span>,<\/span>\u95ea\u56de\u8868<\/span>,<\/span>\u95ea\u56de\u6570\u636e\u5e93\u7b49<\/span>.<\/span>\u4e0b\u9762\u4ecb\u7ecd\u4e24\u4e2a\u7248\u672c\u7684\u533a\u522b<\/span>:<\/span><\/span><\/span><\/p>\n

\n

Oracle9i\u00a0<\/span>\u95ea\u56de\u539f\u7406<\/span>:<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0Oracle 9i<\/span>\u4e2d\u63d0\u4f9b\u95ea\u56de\u67e5\u8be2<\/span>,<\/span>\u7531\u4e00\u4e2a\u65b0\u7684\u5305<\/span>DBMS_FLASH<\/span>\u6765\u5b9e\u73b0<\/span>.<\/span>\u7528\u6237\u4f7f\u7528\u95ea\u56de\u67e5\u8be2\u53ef\u4ee5\u53ca\u65f6\u53d6\u5f97\u8bef\u64cd\u4f5c<\/span>DML(Delete, Update, Insert)<\/span>\u524d\u67d0\u4e00\u65f6\u95f4\u70b9\u6570\u636e\u5e93\u7684\u6620\u50cf\u89c6\u56fe<\/span>,<\/span>\u7528\u6237\u53ef\u4ee5\u5229\u7528\u7cfb\u7edf\u65f6\u95f4\u6216\u7cfb\u7edf\u6539\u53d8\u53f7<\/span>(SCN<\/span>\uff1a<\/span>System Change Number)<\/span>\u6765\u6307\u5b9a\u8fd9\u4e2a\u53ea\u8bfb\u89c6\u56fe<\/span>,<\/span>\u5e76\u53ef\u4ee5\u9488\u5bf9\u9519\u8bef\u8fdb\u884c\u76f8\u5e94\u7684\u6062\u590d\u63aa\u65bd<\/span>.<\/span>\u95ea\u56de\u67e5\u8be2\u529f\u80fd\u5b8c\u5168\u4f9d\u8d56\u4e8e\u81ea\u52a8\u56de\u6eda\u6bb5\u7ba1\u7406<\/span>(AUM),<\/span>\u5bf9\u4e8e<\/span>Drop<\/span>\u7b49\u8bef\u64cd\u4f5c\u4e0d\u80fd\u6062\u590d<\/span>.<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0<\/span>\u56e0\u4e3a<\/span>Oracle9i<\/span>\u4f7f\u7528<\/span>undo<\/span>\u6765\u4f5c\u4e3a<\/span>flashback query<\/span>\u7684\u524d\u955c\u50cf\u5b58\u653e\u70b9<\/span>,<\/span>\u6240\u4ee5<\/span>\u00a0undo_management = auto,<\/span>\u800c\u4e14<\/span>undo_retention<\/span>\u8bbe\u7f6e\u65f6\u95f4\u8981\u5408\u7406<\/span>.\u00a0<\/span>\u8fd8\u6709<\/span>5<\/span>\u5206\u949f\u7684\u95ee\u9898<\/span>,9i<\/span>\u7684\u65f6\u5019<\/span>,<\/span>\u6839\u636e\u65f6\u95f4\u6765\u505a<\/span>flashback query,<\/span>\u662f\u5f88\u5bb9\u6613\u6709\u6bd4\u8f83\u5927\u7684\u8bef\u5dee\u7684<\/span>,<\/span>\u4e0d\u8fc7\u5e78\u597d\u7684\u662f<\/span>,10g<\/span>\u6539\u8fdb\u4e86\u8fd9\u4e00\u70b9<\/span>.<\/span>\u5176\u5b9e<\/span>,<\/span>\u4e3b\u8981\u7684\u539f\u56e0\u662f\u56e0\u4e3a<\/span>,9i<\/span>\u7684<\/span>scn<\/span>\u4e0e\u65f6\u95f4\u7684\u540c\u6b65\u95ee\u9898<\/span>,<\/span>\u9700\u8981<\/span>5<\/span>\u5206\u949f\u4ee5\u540e\u624d\u80fd\u540c\u6b65<\/span>,<\/span>\u4e5f\u5c31\u662f\u8bf4<\/span>,<\/span>\u5982\u679c\u65b0\u63d2\u5165\u7684\u6570\u636e<\/span>,<\/span>\u8fd8\u4e0d\u5230<\/span>5<\/span>\u5206\u949f<\/span>,<\/span>\u9a6c\u4e0a\u5c31\u6839\u636e\u65f6\u95f4\u6765<\/span>flashback query,<\/span>\u662f\u67e5\u4e0d\u5230\u6570\u636e\u7684<\/span>.<\/span><\/span><\/span><\/p>\n

1.<\/span>\u67e5\u627e<\/span>SCN, Time<\/span>\u5bf9\u5e94\u5173\u7cfb<\/span>:SELECT to_char(sysdate, ‘yyyy-mm-dd hh24:mi:ss’),<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0to_char(DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER) AS\u00a0SCN<\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0FROM dual;\u00a0\u00a0<\/span><\/span><\/p>\n

2.<\/span>\u901a\u8fc7\u65f6\u95f4<\/span>flashback query<\/span>\u6570\u636e<\/span>:SELECT * FROM test AS OF TIMESTAMP<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 TO_TIMESTAMP(‘2007-04-09 11:25:17’, ‘YYYY-MM-DD HH:MI:SS’);\u00a0\u00a0\u00a0<\/span><\/span><\/p>\n

3.<\/span>\u901a\u8fc7<\/span>SCN<\/span>\u95ea\u56de\u6570\u636e<\/span>:SELECT * FROM test AS OF SCN 23565583;<\/span>\u00a0\u00a0<\/span><\/span><\/span><\/p>\n

——————————————————————————————————-\u00a0\u00a0<\/span><\/span><\/p>\n

Oracle10g\u00a0<\/span>\u95ea\u56de\u539f\u7406<\/span>:<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0Oracle Flashback Database<\/span>\u7279\u6027\u5141\u8bb8\u901a\u8fc7<\/span>SQL<\/span>\u8bed\u53e5<\/span>Flashback Database<\/span>\u8bed\u53e5<\/span>,<\/span>\u8ba9\u6570\u636e\u5e93\u524d\u6eda\u5230\u5f53\u524d\u7684\u524d\u4e00\u4e2a\u65f6\u95f4\u70b9\u6216\u8005<\/span>SCN,<\/span>\u800c\u4e0d\u9700\u8981\u505a\u65f6\u95f4\u70b9\u7684\u6062\u590d<\/span>.<\/span>\u95ea\u56de\u6570\u636e\u5e93\u53ef\u4ee5\u8fc5\u901f\u5c06\u6570\u636e\u5e93\u56de\u5230\u8bef\u64cd\u4f5c\u6216\u4eba\u4e3a\u9519\u8bef\u7684\u524d\u4e00\u4e2a\u65f6\u95f4\u70b9<\/span>,<\/span>\u5982<\/span>Word<\/span>\u4e2d\u7684<\/span>“<\/span>\u64a4\u6d88<\/span>“<\/span>\u64cd\u4f5c<\/span>,<\/span>\u53ef\u4ee5\u4e0d\u5229\u7528\u5907\u4efd\u5c31\u5feb\u901f\u7684\u5b9e\u73b0\u57fa\u4e8e\u65f6\u95f4\u70b9\u7684\u6062\u590d<\/span>.Oracle<\/span>\u901a\u8fc7\u521b\u5efa\u65b0\u7684<\/span>Flashback Logs(<\/span>\u95ea\u56de\u65e5\u5fd7<\/span>),<\/span>\u8bb0\u5f55\u6570\u636e\u5e93\u7684\u95ea\u56de\u64cd\u4f5c<\/span>.<\/span>\u5982\u679c\u5e0c\u671b\u80fd\u95ea\u56de\u6570\u636e\u5e93<\/span>,<\/span>\u9700\u8981\u8bbe\u7f6e\u5982\u4e0b\u53c2\u6570\uff1a<\/span>1.DB_RECOVER_FILE_DEST<\/span>\u65e5\u5fd7\u7684\u5b58\u653e\u4f4d\u7f6e<\/span>,<\/span>\u3002<\/span><\/span><\/span><\/p>\n

2.DB_RECOVER_FILE_DEST_SIZE<\/span>\u6062\u590d\u533a\u7684\u5927\u5c0f<\/span>.<\/span>\u5728\u521b\u5efa\u6570\u636e\u5e93\u7684\u65f6\u5019<\/span>,Oracle<\/span>\u5c06\u81ea\u52a8\u521b\u5efa\u6062\u590d\u533a<\/span>,<\/span>\u4f46\u9ed8\u8ba4\u662f\u5173\u95ed\u7684<\/span>,<\/span>\u9700\u8981\u6267\u884c<\/span>\u00a0alter database flashback on<\/span>\u547d\u4ee4<\/span>.<\/span><\/span><\/span><\/p>\n

SQL>flashback database to time to_timestamp(xxx);<\/span><\/span><\/p>\n

SQL>flashback database to scn xxx\u00a0<\/span>\uff1b<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0<\/span>Oracle Flashback Table<\/span>\u7279\u6027\u5141\u8bb8\u5229\u7528<\/span>Flashback Table<\/span>\u8bed\u53e5<\/span>,<\/span>\u786e\u4fdd\u95ea\u56de\u5230\u8868\u7684\u524d\u4e00\u4e2a\u65f6\u95f4\u70b9<\/span>.<\/span>\u4e0e<\/span>Oracle 9i<\/span>\u4e2d\u7684<\/span>Flashback Query<\/span>\u76f8\u4f3c<\/span>,<\/span>\u5229\u7528\u56de\u6eda\u6bb5\u4fe1\u606f\u6765\u6062\u590d\u4e00\u4e2a\u6216\u4e00\u4e9b\u8868\u5230\u4ee5\u524d\u7684\u4e00\u4e2a\u65f6\u95f4\u70b9<\/span>(<\/span>\u4e00\u4e2a\u5feb\u7167<\/span>).<\/span>\u8981\u6ce8\u610f\u7684\u662f<\/span>,Flashback Table<\/span>\u4e0d\u7b49\u4e8e<\/span>Flashback Query, Flashback Query<\/span>\u4ec5\u4ec5\u662f\u67e5\u8be2\u4ee5\u524d\u7684\u4e00\u4e2a\u5feb\u7167\u70b9\u800c\u5df2<\/span>,<\/span>\u5e76\u4e0d\u6539\u53d8\u5f53\u524d\u8868\u7684\u72b6\u6001<\/span>,<\/span>\u800c<\/span>Flashback Table<\/span>\u5c06\u6539\u53d8\u5f53\u524d\u8868\u53ca\u9644\u5c5e\u5bf9\u8c61\u4e00\u8d77\u56de\u5230\u4ee5\u524d\u7684\u65f6\u95f4\u70b9<\/span>.<\/span><\/span><\/span><\/p>\n

flashback table tablename to timestamp xxx<\/span>\u6216<\/span><\/span><\/span><\/p>\n

flashback table tablename to scn xxx\u00a0<\/span><\/span><\/p>\n

\u4f8b\u5982\uff1a<\/span>SQL>flashback table test to timestamp to_timestamp(‘2005-05-07 15:00:00’, ‘yyyy-mm-dd hh24:mi:ss’);<\/span>\u00a0\u00a0<\/span><\/span><\/span><\/p>\n

\u00a0\u00a0\u00a0\u00a0<\/span>Oracle Flashback Drop<\/span>\u7279\u6027\u63d0\u4f9b\u4e00\u4e2a\u7c7b\u4f3c\u56de\u6536\u7ad9\u7684\u529f\u80fd<\/span>,<\/span>\u7528\u6765\u6062\u590d\u4e0d\u5c0f\u5fc3\u88ab\u5220\u9664\u7684\u8868<\/span>.<\/span>\u5f53\u5220\u9664\u8868\u65f6<\/span>,Oracle 10g<\/span>\u5e76\u4e0d\u7acb\u523b\u91ca\u653e\u88ab\u5220\u9664\u7684\u8868\u6240\u5360\u7528\u7684\u7a7a\u95f4<\/span>,<\/span>\u800c\u662f\u5c06\u8fd9\u4e2a\u88ab\u5220\u9664\u7684\u8868\u8fdb\u884c\u81ea\u52a8\u91cd\u547d\u540d<\/span>(<\/span>\u4e3a\u4e86\u907f\u514d\u540c\u7c7b\u5bf9\u8c61\u540d\u79f0\u7684\u91cd\u590d<\/span>)<\/span>\u5e76\u653e\u8fdb\u56de\u6536\u7ad9\u4e2d<\/span>.<\/span>\u6240\u8c13\u7684\u56de\u6536\u7ad9\u7c7b\u4f3c\u4e8e<\/span>\u00a0Windows<\/span>\u7cfb\u7edf\u4e2d\u7684\u56de\u6536\u7ad9<\/span>,<\/span>\u662f\u4e00\u4e2a\u865a\u62df\u7684\u5bb9\u5668<\/span>,<\/span>\u7528\u4e8e\u5b58\u653e\u6240\u6709\u88ab\u5220\u9664\u7684\u5bf9\u8c61<\/span>,<\/span>\u5728\u56de\u6536\u7ad9\u4e2d\u88ab\u5220\u9664\u7684\u5bf9\u8c61\u5c06\u5360\u7528\u521b\u5efa\u65f6\u7684\u540c\u6837\u7684\u7a7a\u95f4<\/span>.<\/span>\u5982\u679c\u8fd9\u4e2a\u88ab\u5220\u9664\u7684\u8868\u9700\u8981\u8fdb\u884c\u6062\u590d<\/span>,<\/span>\u5c31\u53ef\u5229\u7528<\/span>Flashback Drop<\/span>\u529f\u80fd<\/span>.<\/span><\/span><\/span><\/p>\n

SQL>show recyclebin;<\/span><\/span><\/p>\n

SQL>drop table test_drop;<\/span><\/span><\/p>\n

SQL>show recyclebin;<\/span><\/span><\/p>\n

ORIGINAL NAME RECYCLEBIN NAME OBJECT TYPE DROP TIME<\/span><\/span><\/p>\n

TEST_DROP BIN$b+XkkO1RS5K10uKo9BfmuA==$0 TABLE 2005-05-07:14:30:47\u00a0<\/span><\/span><\/p>\n

SQL>flashback table test_drop to before drop;<\/span>\u6216<\/span><\/span><\/span><\/p>\n

SQL>flashback table “BIN$b+XkkO1RS5K10uKo9BfmuA==$0” to before drop;<\/span><\/span><\/p>\n

\u6700\u540e\u6e05\u7406\u56de\u6536\u7ad9\uff1a<\/span><\/span><\/p>\n

1.<\/span>\u6e05\u9664\u56de\u6536\u7ad9\u4e2d\u7684\u5355\u4e2a\u8868<\/span>:purge table test_drop<\/span><\/span><\/span><\/p>\n

2.<\/span>\u6e05\u9664\u6574\u4e2a\u56de\u6536\u7ad9<\/span>:purge recyclebin<\/span><\/span><\/span><\/p>\n

3.<\/span>\u6e05\u9664\u4e0d\u540c\u7684\u5bf9\u8c61\u56de\u6536\u7ad9<\/span>:purge user_recyclebin<\/span>\u6216<\/span>purge dba_recyclebin<\/span>\u00a0<\/span><\/span><\/span><\/p>\n

4.<\/span>\u5f7b\u5e95\u5220\u9664\u4e00\u4e2a<\/span>table:SQL>drop table test_drop purge;<\/span>\u5c31\u4e0d\u80fd\u88ab\u6062\u590d\u4e86<\/span>.<\/span><\/span><\/span><\/p>\n<\/div>\n

<\/div>\n","protected":false},"excerpt":{"rendered":"

Oracle\u4ece9i\u5f00\u59cb\u63d0\u4f9b\u4e86\u57fa\u4e8e\u56de\u6eda\u6bb5\u7684\u95ea\u56de\u67e5\u8be2(Flashback Query)\u529f\u80fd,\u53ef\u7528\u4e8e\u6062\u590d\u9519\u8bef\u7684DML […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[34,2],"class_list":["post-47","post","type-post","status-publish","format-standard","hentry","category-oracle","tag-oracle","tag-oracle_basics"],"_links":{"self":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/47","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=47"}],"version-history":[{"count":0,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/47\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=47"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=47"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=47"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}