{"id":51,"date":"2010-12-28T16:02:26","date_gmt":"2010-12-28T08:02:26","guid":{"rendered":"http:\/\/www.royalwzy.com\/?p=51"},"modified":"2013-12-30T10:58:45","modified_gmt":"2013-12-30T02:58:45","slug":"oracle-10g-%e6%9f%a5%e8%af%a2%e9%97%aa%e5%9b%9e%e5%8a%9f%e8%83%bd%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"http:\/\/www.royalwzy.com\/?p=51","title":{"rendered":"Oracle 10g \u67e5\u8be2\u95ea\u56de\u529f\u80fd\u5e94\u7528"},"content":{"rendered":"

\u5728<\/span>Oracle<\/span>\u4e2d\u5982\u679c\u9519\u8bef\u5730\u63d0\u4ea4\u4e86\u4fee\u6539\u64cd\u4f5c<\/span>,<\/span>\u7136\u540e\u60f3\u67e5\u770b\u5e76\u4fee\u6539\u539f\u6765\u7684\u503c<\/span>,<\/span>\u8fd9\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u67e5\u8be2\u95ea\u56de<\/span>(query flashback).<\/span><\/span><\/span><\/span><\/p>\n

\u67e5\u8be2\u95ea\u56de\u53ef\u4ee5\u6839\u636e\u6839\u636e\u4e00\u4e2a\u65f6\u95f4\u503c\u6216\u8005\u7cfb\u7edf\u53d8\u66f4\u53f7<\/span>(SCN:System Change Number)<\/span>\u8fdb\u884c<\/span>,<\/span>\u6570\u636e\u5e93\u4f7f\u7528<\/span>SCN<\/span>\u6765\u8ddf\u8e2a\u5bf9\u6570\u636e\u8fdb\u884c\u7684\u4fee\u6539<\/span>,<\/span>\u56e0\u6b64\u53ef\u4ee5\u7528\u5b83\u6765\u95ea\u56de\u5230\u6570\u636e\u5e93\u4e2d\u4e00\u4e2a\u7279\u5b9a\u7684<\/span>SCN<\/span>\u65f6\u7684\u72b6\u6001<\/span>.<\/span><\/span><\/span><\/span><\/span><\/p>\n

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

\u4e00<\/span>.<\/span>\u6267\u884c\u95ea\u56de\u64cd\u4f5c<\/span>,<\/span>\u9700\u8981\u4f7f\u7528<\/span>DBMS_FLASHBACK<\/span>\u5305<\/span>,<\/span>\u767b\u5f55\u7528\u6237\u8981\u5177\u6709\u6b64\u5305\u7684<\/span>EXECUTE<\/span>\u6743\u9650<\/span>,<\/span>\u4e0b\u9762\u4ee5<\/span>sys<\/span>\u8eab\u4efd\u767b\u5f55<\/span>,<\/span>\u5e76\u6388\u6743\u7ed9\u7528\u6237<\/span>EXECUTE<\/span>\u6743\u9650<\/span>:<\/span><\/span><\/span><\/span><\/span><\/p>\n

CONNECT<\/span>\u00a0SYS<\/span>\/P@ssw0rd\u00a0AS<\/span>\u00a0SYSDBA<\/span>;<\/span><\/span><\/p>\n

GRANT<\/span>\u00a0EXECUTE<\/span>\u00a0ON<\/span>\u00a0SYS<\/span>.DBMS_FLASHBACK\u00a0TO<\/span>\u00a0UserName;<\/span><\/span><\/p>\n

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

\u4e8c<\/span>.<\/span>\u65f6\u95f4\u67e5\u8be2\u95ea\u56de<\/span><\/span><\/span><\/span><\/span><\/p>\n

1.<\/span>\u6267\u884c<\/span>SQL<\/span>\u8bed\u53e5\u4ece<\/span>products<\/span>\u4e2d\u67e5\u8be2\u524d\u4e94\u6761\u8bb0\u5f55<\/span>,<\/span>\u5982\u4e0b<\/span>:<\/span><\/span><\/span><\/span><\/span><\/p>\n

SELECT<\/span>\u00a0product_id, name, price,\u00a0SYSDATE<\/span>\u00a0AS<\/span>\u00a0TIME<\/span><\/span><\/span><\/span><\/p>\n

FROM<\/span>\u00a0products<\/span><\/span><\/p>\n

WHERE<\/span>\u00a0product_id <= 5;<\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/span><\/span><\/span><\/span><\/p>\n

2.<\/span>\u66f4\u65b0\u8bb0\u5f55<\/span>,<\/span>\u5982\u4e0b<\/span>:<\/span><\/span><\/span><\/span><\/span><\/p>\n

SELECT<\/span>\u00a0product_id,\u00a0NAME<\/span>, price,\u00a0SYSDATE<\/span>\u00a0AS<\/span>\u00a0TIME<\/span><\/span><\/span><\/span><\/p>\n

FROM<\/span>\u00a0products<\/span><\/span><\/p>\n

WHERE<\/span>\u00a0product_id <= 5;<\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/span><\/span><\/span><\/span><\/p>\n

3.<\/span>\u6267\u884c<\/span>DBMS_FLASHBACK.ENABLE_AT_TIME()<\/span>\u8bed\u53e5<\/span>,<\/span>\u95ea\u56de\u5230\u4e00\u4e2a\u7279\u5b9a\u7684\u65f6\u95f4<\/span>,<\/span>\u5982\u4e0b<\/span>:<\/span><\/span><\/span><\/span><\/span><\/p>\n

DBMS_FLASHBACK.ENABLE_AT_TIME(SYSDATE<\/span>\u00a0– 10 \/ 1440);<\/span><\/span><\/span><\/span><\/p>\n

\u95ea\u56de\u5230<\/span>10<\/span>\u5206\u949f\u4e4b\u524d<\/span>(24h * 60mins = 1440Mins).<\/span><\/span><\/span><\/span><\/span><\/p>\n

4.<\/span>\u73b0\u5728\u6267\u884c\u67e5\u8be2<\/span>,<\/span>\u7ed3\u679c\u5982\u4e0b\uff1a<\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/span><\/span><\/span><\/span><\/p>\n

5.<\/span>\u7981\u7528\u95ea\u56de<\/span>\u00a0<\/span>EXECUTE DBMS_FLASHBACK.DISABLE();\u00a0<\/span>\u5728\u518d\u6b21\u542f\u7528\u95ea\u56de\u64cd\u4f5c\u524d<\/span>,<\/span>\u5fc5\u987b\u5148\u5c06\u5176\u7981\u7528<\/span>.<\/span>\u8fd9\u4e9b\u547d\u4ee4\u53ea\u80fd\u5728<\/span>sqlplus<\/span>\u4e2d\u4f7f\u7528<\/span>,<\/span>\u5728<\/span>pl\/sql<\/span>\u4e2d\u4e0d\u80fd\u4f7f\u7528<\/span>.<\/span><\/span><\/span><\/span><\/span><\/p>\n

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

\u4e09<\/span>.<\/span>\u7cfb\u7edf\u53d8\u66f4\u53f7\u67e5\u8be2\u95ea\u56de<\/span><\/span><\/span><\/span><\/span><\/p>\n

\u6839\u636e<\/span>SCN<\/span>\u8fdb\u884c\u95ea\u56de\u64cd\u4f5c\u6bd4\u6839\u636e\u65f6\u95f4\u8fdb\u884c\u8981\u66f4\u7cbe\u786e<\/span>,<\/span>\u56e0\u4e3a\u6570\u636e\u5e93\u5c31\u662f\u4f7f\u7528<\/span>SCN<\/span>\u6765\u8ddf\u8e2a\u6570\u636e\u5e93\u7684\u53d8\u5316<\/span>.<\/span><\/span><\/span><\/span><\/span><\/p>\n

1.<\/span>\u83b7\u5f97\u5f53\u524d<\/span>SCN<\/span>\u547d\u4ee4\uff1a<\/span><\/span><\/span><\/span><\/span><\/p>\n

VARIABLE<\/span>\u00a0curr_scn\u00a0NUMBER<\/span>;<\/span><\/span><\/p>\n

EXECUTE<\/span>\u00a0:curr_scn := DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER();<\/span><\/span><\/p>\n

print curr_scn<\/span><\/span><\/p>\n

\"\"<\/span><\/span><\/span><\/span><\/p>\n

2.<\/span>\u63d2\u5165\u4e00\u6761\u8bb0\u5f55<\/span>.<\/span><\/span><\/span><\/span><\/span><\/p>\n

SELECT<\/span>\u00a0*\u00a0FROM<\/span>\u00a0products;<\/span><\/span><\/p>\n

INSERT<\/span>\u00a0INTO<\/span>\u00a0products(product_id, product_type_id,\u00a0NAME<\/span>,\u00a0DESCRIPTION<\/span>, price)<\/span><\/span><\/p>\n

VALUES<\/span>(13, 5, ‘Kobe Bryant’, ‘No.24’, ‘24.00’);<\/span><\/span><\/span><\/span><\/p>\n

SELECT<\/span>\u00a0*<\/span><\/span><\/p>\n

FROM<\/span>\u00a0products<\/span><\/span><\/p>\n

WHERE<\/span>\u00a0product_id = 13;<\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/span><\/span><\/span><\/span><\/p>\n

3.<\/span>\u901a\u8fc7<\/span>DBMS_FLASHBACK.ENABLE_AT_SYSTEM_CHANGE_NUMBER()<\/span>\u8bed\u53e5\u53ef\u4ee5\u95ea\u56de\u5230\u8fd9\u4e2a<\/span>SCN<\/span>\u7684\u72b6\u6001<\/span>,<\/span>\u9700\u8981\u4e00\u4e2a<\/span>SCN<\/span>\u53c2\u6570<\/span>.<\/span><\/span><\/span><\/span><\/span><\/p>\n

EXECUTE DBMS_FLASHBACK.ENABLE_AT_SYSTEM_CHANGE_NUMBER(:curr_scn);<\/span><\/span><\/span><\/span><\/p>\n

4.<\/span>\u67e5\u8be2\u521a\u521a\u63d2\u5165\u7684\u6570\u636e<\/span>,<\/span>\u6ca1\u6709\u4efb\u4f55\u8bb0\u5f55<\/span>.<\/span><\/span><\/span><\/span><\/span><\/p>\n

SELECT<\/span>\u00a0*<\/span><\/span><\/p>\n

FROM<\/span>\u00a0products<\/span><\/span><\/p>\n

WHERE<\/span>\u00a0product_id = 13;<\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/span><\/span><\/span><\/span><\/p>\n

5.<\/span>\u7981\u7528\u95ea\u56de\u64cd<\/span>:EXECUTE DBMS_FLASHBACK.DISABLE();<\/span><\/span><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

\u5728Oracle\u4e2d\u5982\u679c\u9519\u8bef\u5730\u63d0\u4ea4\u4e86\u4fee\u6539\u64cd\u4f5c,\u7136\u540e\u60f3\u67e5\u770b\u5e76\u4fee\u6539\u539f\u6765\u7684\u503c,\u8fd9\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528\u67e5\u8be2\u95ea\u56de(query fla […]<\/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-51","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\/51","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=51"}],"version-history":[{"count":0,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=\/wp\/v2\/posts\/51\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=51"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=51"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.royalwzy.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=51"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}