{"id":872,"date":"2009-05-14T09:16:52","date_gmt":"2009-05-14T14:16:52","guid":{"rendered":"http:\/\/jianmingli.com\/wp\/?p=872"},"modified":"2009-06-18T20:31:00","modified_gmt":"2009-06-19T01:31:00","slug":"oracle-dataguard","status":"publish","type":"post","link":"https:\/\/jianmingli.com\/wp\/?p=872","title":{"rendered":"Oracle DataGuard"},"content":{"rendered":"<span id=\"Overview\"><h1>Overview<\/h1><\/span>\n<p>* DataGuard is a Oracle software component to create\/maintain\/monitor one or more (up to nine) standby databases.<br \/>\n* Redo log files are transferred (ind sync or async mode) and applied to standby databases.<br \/>\n* Two operation modes<br \/>\n&#8211; Redo apply: physical standby<br \/>\n&#8211; SQL apply: logical standby. Can be used concurrently for queries for reporting etc.<br \/>\n* Can be managed by SQL*Plus or DataGuard Broker<\/p>\n<span id=\"Configuration\"><h1>Configuration<\/h1><\/span>\n<p>* Requires same OS (e.g. Linux on Intel) on both primary and standby systems.<br \/>\n* Same release of Oracle Enterprise Edition on both primary and standby systems.<\/p>\n<span id=\"Failover_and_Swithover\"><h1>Failover and Swithover<\/h1><\/span>\n<span id=\"Failover\"><h2>Failover<\/h2><\/span>\n<p>* Primary db goes out<br \/>\n* One of the standby db is brought in as new primary db<br \/>\n* If Flashback Database feature is installed on original primary db,<br \/>\n&#8211; original primary db can be bought back as standby db<br \/>\n* If Flashback Database feature is NOT installed on primary db,<br \/>\n&#8211; original primary db can ONLY be created from a <strong>backup copy<\/strong> of the new primary db<\/p>\n<span id=\"Switchover\"><h2>Switchover<\/h2><\/span>\n<p>* Planned reversal of primary and standby db<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview * DataGuard is a Oracle software component to create\/maintain\/monitor one or more (up to nine) standby databases. * Redo log files are transferred (ind sync or async mode) and applied to standby databases. * Two operation modes &#8211; Redo &hellip; <a href=\"https:\/\/jianmingli.com\/wp\/?p=872\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[35],"tags":[],"class_list":["post-872","post","type-post","status-publish","format-standard","hentry","category-oracle"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8cRUO-e4","_links":{"self":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/872","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=872"}],"version-history":[{"count":2,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/872\/revisions"}],"predecessor-version":[{"id":1013,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=\/wp\/v2\/posts\/872\/revisions\/1013"}],"wp:attachment":[{"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jianmingli.com\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}