{"id":12452,"date":"2019-05-03T20:04:29","date_gmt":"2019-05-03T18:04:29","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/oracle-19c-dynamic-change-of-fast-start-failover-target\/"},"modified":"2023-06-15T16:31:57","modified_gmt":"2023-06-15T14:31:57","slug":"oracle-19c-dynamic-change-of-fast-start-failover-target","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/oracle-19c-dynamic-change-of-fast-start-failover-target\/","title":{"rendered":"Oracle 19C : Dynamic Change of Fast-Start Failover Target"},"content":{"rendered":"

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

Oracle 19C is now available on premise. There are lot of new features. One for the Data Guard Broker is that now we can dynamically change the fast-start failover target to a specified member in the list without disabling the fast-start failover.
\nI have tested this new feature and is describing this in this blog
\nI am using 3 servers with Oracle Linux
\nThe Data Guard is already built and the broker is already configured
\nTo enable the fast-start failover there are some requirements. Note that flashback database must be enabled for both databases.
\nFirst we put the the transport to SYNC for 3 databases<\/p>\n

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DGMGRL> edit <\/code>database<\/code> 'DB19C_SITE1'<\/code> set<\/code> property LogXptMode=<\/code>'SYNC'<\/code>;<\/code><\/div>\n
Property <\/code>\"logxptmode\"<\/code> updated<\/code><\/div>\n
DGMGRL> edit <\/code>database<\/code> 'DB19C_SITE2'<\/code> set<\/code> property LogXptMode=<\/code>'SYNC'<\/code>;<\/code><\/div>\n
Property <\/code>\"logxptmode\"<\/code> updated<\/code><\/div>\n
DGMGRL> edit <\/code>database<\/code> 'DB19C_SITE3'<\/code> set<\/code> property LogXptMode=<\/code>'SYNC'<\/code>;<\/code><\/div>\n
Property <\/code>\"logxptmode\"<\/code> updated<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

After we change the protection to Maxavailability<\/p>\n

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DGMGRL>\u00a0 EDIT CONFIGURATION <\/code>SET<\/code> PROTECTION MODE <\/code>AS<\/code> MaxAvailability;<\/code><\/div>\n
Succeeded.<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Then we set the fast-start failover target for both databases<\/p>\n

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DGMGRL> enable fast_start failover;<\/code><\/div>\n
Enabled <\/code>in<\/code> Zero Data Loss Mode.<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Below the status of the configuration. And we can see that DB19C_SITE2 is the target for the fast-start failover<\/p>\n

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DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - db19c<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxAvailability<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>DB19C_SITE1 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB19C_SITE2 - (*) Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB19C_SITE3 - Physical standby <\/code>database<\/code><\/div>\n
<\/div>\n
Fast-Start Failover: Enabled <\/code>in<\/code> Zero Data Loss Mode<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 55 seconds ago)<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The status of the observer will also show as the active target<\/p>\n

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DGMGRL> show observer<\/code><\/div>\n
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Configuration - db19c<\/code><\/div>\n
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\u00a0\u00a0<\/code>Primary<\/code>:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 DB19C_SITE1<\/code><\/div>\n
\u00a0\u00a0<\/code>Active Target:\u00a0\u00a0\u00a0\u00a0\u00a0 DB19C_SITE2<\/code><\/div>\n
<\/div>\n
Observer <\/code>\"standserver2\"<\/code> - Master<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Host <\/code>Name<\/code>:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 standserver2<\/code><\/div>\n
\u00a0\u00a0<\/code>Last<\/code> Ping <\/code>to<\/code> Primary<\/code>:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 2 seconds ago<\/code><\/div>\n
\u00a0\u00a0<\/code>Last<\/code> Ping <\/code>to<\/code> Target:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 4 seconds ago<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

For example let\u2019s say we want to switchover to DB19C_SITE3<\/p>\n

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DGMGRL> switchover <\/code>to<\/code> 'DB19C_SITE3'<\/code>;<\/code><\/div>\n
Performing switchover NOW, please wait...<\/code><\/div>\n
Error: ORA-16655: specified standby <\/code>database<\/code> not<\/code> the <\/code>current<\/code> fast-start failover target standby<\/code><\/div>\n
<\/div>\n
Failed.<\/code><\/div>\n
Unable <\/code>to<\/code> switchover, <\/code>primary<\/code> database<\/code> is<\/code> still <\/code>\"DB19C_SITE1\"<\/code><\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

As we can see we cannot because the first fast-start failover target is DB19C_SITE2. We have to change it to DB19C_SITE3
\nTo dynamiccaly do this change , we use the command SET FAST_START FAILOVER TARGET.<\/p>\n

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DGMGRL> <\/code>SET<\/code> FAST_START FAILOVER TARGET <\/code>TO<\/code> 'DB19C_SITE3'<\/code>;<\/code><\/div>\n
Waiting <\/code>for<\/code> Fast-Start Failover target <\/code>to<\/code> change <\/code>to<\/code> \"DB19C_SITE3\"<\/code>...<\/code><\/div>\n
Succeeded.<\/code><\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

We can query the broker to verify the change<\/p>\n

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DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - db19c<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxAvailability<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>DB19C_SITE1 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB19C_SITE3 - (*) Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB19C_SITE2 - Physical standby <\/code>database<\/code><\/div>\n
<\/div>\n
Fast-Start Failover: Enabled <\/code>in<\/code> Zero Data Loss Mode<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 22 seconds ago)<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And then now I can switchover to DB19C_SITE3<\/p>\n

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DGMGRL> switchover <\/code>to<\/code> 'DB19C_SITE3'<\/code>;<\/code><\/div>\n
Performing switchover NOW, please wait...<\/code><\/div>\n
New <\/code>primary<\/code> database<\/code> \"DB19C_SITE3\"<\/code> is<\/code> opening...<\/code><\/div>\n
Operation requires start up <\/code>of<\/code> instance <\/code>\"DB19C\"<\/code> on<\/code> database<\/code> \"DB19C_SITE1\"<\/code><\/div>\n
Starting instance <\/code>\"DB19C\"<\/code>...<\/code><\/div>\n
Connected <\/code>to<\/code> an idle instance.<\/code><\/div>\n
ORACLE instance started.<\/code><\/div>\n
Connected <\/code>to<\/code> \"DB19C_SITE1\"<\/code><\/div>\n
Database<\/code> mounted.<\/code><\/div>\n
Database<\/code> opened.<\/code><\/div>\n
Connected <\/code>to<\/code> \"DB19C_SITE1\"<\/code><\/div>\n
Switchover succeeded, new <\/code>primary<\/code> is<\/code> \"DB19C_SITE3\"<\/code><\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And the new status of the configuration<\/p>\n

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\n
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DGMGRL> show configuration<\/code><\/div>\n
<\/div>\n
Configuration - db19c<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0<\/code>Protection Mode: MaxAvailability<\/code><\/div>\n
\u00a0\u00a0<\/code>Members:<\/code><\/div>\n
\u00a0\u00a0<\/code>DB19C_SITE3 - <\/code>Primary<\/code> database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB19C_SITE1 - (*) Physical standby <\/code>database<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DB19C_SITE2 - Physical standby <\/code>database<\/code><\/div>\n
<\/div>\n
Fast-Start Failover: Enabled <\/code>in<\/code> Zero Data Loss Mode<\/code><\/div>\n
<\/div>\n
Configuration Status:<\/code><\/div>\n
SUCCESS\u00a0\u00a0 (status updated 51 seconds ago)<\/code><\/div>\n
<\/div>\n
DGMGRL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw Oracle 19C is now available on premise. There are lot of new features. One for the Data Guard Broker is that now we can dynamically change the fast-start failover target to a specified member in the list without disabling the fast-start failover. I have tested this new feature and is describing this […]<\/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":[229,59],"tags":[221,298,1171,1430],"type_dbi":[],"class_list":["post-12452","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-oracle","tag-data-guard","tag-fast-start-failover","tag-oracle-19c","tag-oracle-broker"],"acf":[],"yoast_head":"\nOracle 19C : Dynamic Change of Fast-Start Failover Target - dbi Blog<\/title>\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\/oracle-19c-dynamic-change-of-fast-start-failover-target\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle 19C : Dynamic Change of Fast-Start Failover Target\" \/>\n<meta property=\"og:description\" content=\"By Mouhamadou Diaw Oracle 19C is now available on premise. 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