{"id":9595,"date":"2016-12-15T21:41:28","date_gmt":"2016-12-15T20:41:28","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/"},"modified":"2023-06-08T16:16:27","modified_gmt":"2023-06-08T14:16:27","slug":"dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/","title":{"rendered":"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets"},"content":{"rendered":"

By Mouhamadou Diaw<\/strong><\/p>\n

In a previous blog<\/a>, we talked about Fast-Start Failover with the MaxProtection mode.
\nWith Oracle 12.2 Oracle Data Guard now supports multiple failover targets in a fast-start failover configuration.
\nPrevious functionality allowed for only a single fast-start failover target. If the failover target was unable to meet the requirements for fast-start failover at the time of primary failure, then an automatic failure would not occur.
\nDesignating multiple failover targets significantly improves the likelihood that there will always be a standby suitable for automatic failover when needed.
\nMultiple failover targets increase high availability by making an automatic failover more likely to occur if there is a primary outage.
\nIndeed FastStartFailoverTarget can now have as value one site
\n
\nDGMGRL> edit database 'ORCL_SITE' set property FastStartFailoverTarget='ORCL_SITE1';
\nProperty \"faststartfailovertarget\" updated
\nDGMGRL>
\n<\/code>
\n
\nDGMGRL> enable fast_start failover;
\nEnabled.
\nDGMGRL> show fast_start failover;
\nFast-Start Failover: ENABLED
\nThreshold: 30 seconds
\nTarget: ORCL_SITE1
\nObserver: standserver1.localdomain
\nLag Limit: 30 seconds (not in use)
\nShutdown Primary: TRUE
\nAuto-reinstate: TRUE
\nObserver Reconnect: (none)
\nObserver Override: FALSE
\n<\/code>
\nIt can also have as values two sites (Priority following the order)
\n
\nDGMGRL> disable Fast_start Failover;
\nDisabled.
\nDGMGRL> edit database 'ORCL_SITE' set property FastStartFailoverTarget='ORCL_SITE1,ORCL_SITE2';
\nProperty \"faststartfailovertarget\" updated
\nDGMGRL>
\n<\/code>
\n
\nDGMGRL> enable fast_start failover;
\nEnabled.
\nDGMGRL> show fast_start failover;
\nFast-Start Failover: ENABLED
\nThreshold: 30 seconds
\nTarget: ORCL_SITE1
\nCandidate Targets: ORCL_SITE1,ORCL_SITE2
\nObserver: standserver1.localdomain
\nLag Limit: 30 seconds (not in use)
\nShutdown Primary: TRUE
\nAuto-reinstate: TRUE
\nObserver Reconnect: (none)
\nObserver Override: FALSE
\n<\/code>
\nIt can also have as value the keyword ANY (Priority defined by oracle)
\n
\nDGMGRL> edit database 'ORCL_SITE' set property FastStartFailoverTarget='ANY';
\nProperty \"faststartfailovertarget\" updated
\nDGMGRL> edit database 'ORCL_SITE1' set property FastStartFailoverTarget='ANY';
\nProperty \"faststartfailovertarget\" updated
\nDGMGRL> edit database 'ORCL_SITE2' set property FastStartFailoverTarget='ANY';
\nProperty \"faststartfailovertarget\" updated
\n<\/code>
\nWith the value set to ANY we can see that there is a target failover but also there are also candidate targets. If a failover occurs the order will be ORCL_SITE1 first and if Not available ORCL_SITE2 will be the target.
\n
\nDGMGRL> enable fast_start failover;
\nEnabled.
\nDGMGRL> show fast_start failover;
\nFast-Start Failover: ENABLED
\nThreshold: 30 seconds
\nTarget: ORCL_SITE1
\nCandidate Targets: ORCL_SITE1,ORCL_SITE2
\nObserver: standserver1.localdomain
\nLag Limit: 30 seconds (not in use)
\nShutdown Primary: TRUE
\nAuto-reinstate: TRUE
\nObserver Reconnect: (none)
\nObserver Override: FALSE
\n<\/code>
\nFrom the observer we can confirm that target is ORCL_SITE1
\n
\n[W000 12\/15 14:40:25.12] This observer is no longer registered with the configuration.
\n[W000 12\/15 14:40:25.20] FSFO target standby is ORCL_SITE1
\n[W000 12\/15 14:40:27.66] Observer trace level is set to USER
\n[W000 12\/15 14:40:27.66] Try to connect to the primary.
\n[W000 12\/15 14:40:27.66] Try to connect to the primary ORCL_SITE.
\n[W000 12\/15 14:40:27.67] The standby ORCL_SITE1 is ready to be a FSFO target
\n[W000 12\/15 14:40:29.67] Connection to the primary restored!
\n<\/code>
\nNow let’s simulate the case that ORCL_SITE1 is no longer available, for this let’s simply shutdown ORCL_SITE1 database, the failover target should be changed to ORCL_SITE2
\n
\nSQL> shutdown abort
\nORACLE instance shut down.
\nSQL>
\n<\/code>
\n
\nDGMGRL> show fast_start failover;
\nFast-Start Failover: ENABLED
\nThreshold: 30 seconds
\nTarget: ORCL_SITE2
\nCandidate Targets: ORCL_SITE1,ORCL_SITE2
\nObserver: standserver1.localdomain
\nLag Limit: 30 seconds (not in use)
\nShutdown Primary: TRUE
\nAuto-reinstate: TRUE
\nObserver Reconnect: (none)
\nObserver Override: FALSE
\n<\/code>
\nFrom the observer we can see following messages that confirm that the failover target was switched to ORCL_SITE2
\n
\n[W000 12\/15 14:54:52.00] Permission granted to the primary database for target switch.
\n[W000 12\/15 14:54:54.03] Standby database has changed to ORCL_SITE2.
\n[W000 12\/15 14:54:54.04] Try to connect to the primary.
\n[W000 12\/15 14:54:54.04] Try to connect to the primary ORCL_SITE.
\n[W000 12\/15 14:54:55.48] The primary database returned to SYNC\/NOT LAGGING state with the standby database ORCL_SITE2.
\n[W000 12\/15 14:54:55.48] Connection to the primary restored!
\n[W000 12\/15 14:54:58.48] Disconnecting from database ORCL_SITE.
\n[W000 12\/15 14:55:04.52] The standby ORCL_SITE2 is ready to be a FSFO target
\n<\/code><\/p>\n

Conclusion<\/b>
\nWe have seen that we can now have multiple targets for the Fast-Start Failover and how to implement it<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw In a previous blog, we talked about Fast-Start Failover with the MaxProtection mode. With Oracle 12.2 Oracle Data Guard now supports multiple failover targets in a fast-start failover configuration. Previous functionality allowed for only a single fast-start failover target. If the failover target was unable to meet the requirements for fast-start failover […]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[999,298,1005],"type_dbi":[],"class_list":["post-9595","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","tag-dataguard","tag-fast-start-failover","tag-oracle-12r2"],"acf":[],"yoast_head":"\nDataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets - dbi Blog<\/title>\n<meta name=\"description\" content=\"Dataguard 12.2, fast-start failover,dataguard\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets\" \/>\n<meta property=\"og:description\" content=\"Dataguard 12.2, fast-start failover,dataguard\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-12-15T20:41:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-08T14:16:27+00:00\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets\",\"datePublished\":\"2016-12-15T20:41:28+00:00\",\"dateModified\":\"2023-06-08T14:16:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/\"},\"wordCount\":275,\"commentCount\":0,\"keywords\":[\"DataGuard\",\"Fast-Start Failover\",\"Oracle 12R2\"],\"articleSection\":[\"Database Administration & Monitoring\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/\",\"url\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/\",\"name\":\"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets - dbi Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#website\"},\"datePublished\":\"2016-12-15T20:41:28+00:00\",\"dateModified\":\"2023-06-08T14:16:27+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/66ab87129f2d357f09971bc7936a77ee\"},\"description\":\"Dataguard 12.2, fast-start failover,dataguard\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/\",\"name\":\"dbi Blog\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/#\\\/schema\\\/person\\\/66ab87129f2d357f09971bc7936a77ee\",\"name\":\"Oracle Team\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g\",\"caption\":\"Oracle Team\"},\"url\":\"https:\\\/\\\/www.dbi-services.com\\\/blog\\\/author\\\/oracle-team\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets - dbi Blog","description":"Dataguard 12.2, fast-start failover,dataguard","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/","og_locale":"en_US","og_type":"article","og_title":"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets","og_description":"Dataguard 12.2, fast-start failover,dataguard","og_url":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/","og_site_name":"dbi Blog","article_published_time":"2016-12-15T20:41:28+00:00","article_modified_time":"2023-06-08T14:16:27+00:00","author":"Oracle Team","twitter_card":"summary_large_image","twitter_misc":{"Written by":"Oracle Team","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/#article","isPartOf":{"@id":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/"},"author":{"name":"Oracle Team","@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee"},"headline":"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets","datePublished":"2016-12-15T20:41:28+00:00","dateModified":"2023-06-08T14:16:27+00:00","mainEntityOfPage":{"@id":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/"},"wordCount":275,"commentCount":0,"keywords":["DataGuard","Fast-Start Failover","Oracle 12R2"],"articleSection":["Database Administration & Monitoring"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/","url":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/","name":"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets - dbi Blog","isPartOf":{"@id":"https:\/\/www.dbi-services.com\/blog\/#website"},"datePublished":"2016-12-15T20:41:28+00:00","dateModified":"2023-06-08T14:16:27+00:00","author":{"@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee"},"description":"Dataguard 12.2, fast-start failover,dataguard","breadcrumb":{"@id":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/www.dbi-services.com\/blog\/dataguard-oracle-12-2-support-for-multiple-automatic-failover-targets\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Accueil","item":"https:\/\/www.dbi-services.com\/blog\/"},{"@type":"ListItem","position":2,"name":"Dataguard Oracle 12.2 : Support for Multiple Automatic Failover Targets"}]},{"@type":"WebSite","@id":"https:\/\/www.dbi-services.com\/blog\/#website","url":"https:\/\/www.dbi-services.com\/blog\/","name":"dbi Blog","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.dbi-services.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee","name":"Oracle Team","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/f711f7cd2c9b09bf2627133755b569fb5be0694810cfd33033bdd095fedba86d?s=96&d=mm&r=g","caption":"Oracle Team"},"url":"https:\/\/www.dbi-services.com\/blog\/author\/oracle-team\/"}]}},"_links":{"self":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/9595","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/users\/27"}],"replies":[{"embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/comments?post=9595"}],"version-history":[{"count":1,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/9595\/revisions"}],"predecessor-version":[{"id":25689,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/posts\/9595\/revisions\/25689"}],"wp:attachment":[{"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/media?parent=9595"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/categories?post=9595"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/tags?post=9595"},{"taxonomy":"type","embeddable":true,"href":"https:\/\/www.dbi-services.com\/blog\/wp-json\/wp\/v2\/type_dbi?post=9595"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}