{"id":12683,"date":"2019-07-27T11:43:36","date_gmt":"2019-07-27T09:43:36","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/dbvisit-9-automatic-failover\/"},"modified":"2023-06-15T16:42:52","modified_gmt":"2023-06-15T14:42:52","slug":"dbvisit-9-automatic-failover","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/dbvisit-9-automatic-failover\/","title":{"rendered":"dbvisit 9: Automatic Failover"},"content":{"rendered":"

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

dbvisit 9 is released since a few months. And one new feature I tested is the Automatic Failover. In this blog I suppose that dbvisit 9 is already installed and that the standby database is already created. Indeed I will not describe nor dbvisit installation neither the standby creation as it is the same as the previous versions.
\nFor more info about dbvisit installation and\/or dbvisit standby creation please see these steps in my previous blog <\/a> or dbvisit documentation<\/a>
\nThe new feature Autamatic Failover needs to install an observer which main functions are:
\n-Provide remote monitoring of existing DDCs, and inform the DBA of problems in close to real-time
\n-Automatically perform a Failover of the DDC if previously-specified conditions are met.<\/p>\n

We will describe observer installation and configuration later<\/p>\n

We describe below the configuration we are using
\ndbvisit1: primary server with Oracle 19c
\ndbvisit2: standby server with Oracle 19c
\ndbvisitconsole : Host of the dbvisit console (dbvserver) and for the observer
\n\"\"<\/a><\/p>\n

As specified earlier, we need to install an observer. It is very easy to do this, just launch the install_dbvisit executable and follow the instructions<\/p>\n

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\n
\n
[oracle@dbvisitconsole installer]$ <\/code>pwd<\/code><\/div>\n
\/home\/oracle\/dbvisit\/installer<\/code><\/div>\n
[oracle@dbvisitconsole installer]$ .<\/code>\/install-dbvisit<\/code><\/div>\n
<\/div>\n
-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Welcome to the Dbvisit software installer.<\/code><\/div>\n
-----------------------------------------------------------<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>It is recommended to <\/code>make<\/code> a backup of our current Dbvisit software<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>location (Dbvisit Base location) <\/code>for<\/code> rollback purposes.<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Installer Directory <\/code>\/home\/oracle\/dbvisit<\/code><\/div>\n
<\/div>\n
>>> Please specify the Dbvisit installation directory (Dbvisit Base).<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>The various Dbvisit products and components - such as Dbvisit Standby,<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Dbvisit Dbvnet will be installed <\/code>in<\/code> the appropriate subdirectories of<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>this path.<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Enter a custom value or press ENTER to accept default [<\/code>\/usr\/dbvisit<\/code>]:<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>> <\/code>\/u01\/app\/dbvisit<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DBVISIT_BASE = <\/code>\/u01\/app\/dbvisit<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Component\u00a0\u00a0\u00a0\u00a0\u00a0 Installer Version\u00a0\u00a0 Installed Version<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>standby\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>dbvnet\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>dbvagent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>dbvserver\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>observer\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.02\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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>-----------------------------------------------------------<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>What action would you like to perform?<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>1 - Install component(s)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2 - Uninstall component(s)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>3 - Exit<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Your choice: 1<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Choose component(s):<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>1 - Core Components (Dbvisit Standby Cli, Dbvnet, Dbvagent)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2 - Dbvisit Standby Core (Command Line Interface)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>3 - Dbvnet (Dbvisit Network Communication)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>4 - Dbvagent (Dbvisit Agent)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>5 - Dbvserver (Dbvisit Central Console) - Not available on Solaris<\/code>\/AIX<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>6 - Dbvisit Observer (Automatic Failover Option) - Not available on Solaris<\/code>\/AIX<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Press ENTER to <\/code>exit<\/code> Installer<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Your choice: 6<\/code><\/div>\n
<\/div>\n
-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Summary of the Dbvisit OBSERVER configuration<\/code><\/div>\n
-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>DBVISIT_BASE <\/code>\/u01\/app\/dbvisit<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Press ENTER to <\/code>continue<\/code><\/div>\n
<\/div>\n
-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>About to <\/code>install<\/code> Dbvisit OBSERVER<\/code><\/div>\n
-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Component observer installed.<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Component\u00a0\u00a0\u00a0\u00a0\u00a0 Installer Version\u00a0\u00a0 Installed Version<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>-----------------------------------------------------------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>standby\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>dbvnet\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>dbvagent\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 not installed\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>dbvserver\u00a0\u00a0\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\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\u00a0\u00a0\u00a0 9.0.02_0_gbd40c486\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>observer\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.02\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\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1.02\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 <\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>-----------------------------------------------------------<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>What action would you like to perform?<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>1 - Install component(s)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2 - Uninstall component(s)<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>3 - Exit<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Your choice: 3<\/code><\/div>\n
<\/div>\n
>>> Installation completed<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>Install log <\/code>\/tmp\/dbvisit_install<\/code>.log.201907231647.<\/code><\/div>\n
[oracle@dbvisitconsole installer]$<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And once the installation done, we can start it<\/p>\n

\n
\n\n\n\n
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\n
\n
[oracle@dbvisitconsole observer]$ .<\/code>\/observersvc<\/code> start &<\/code><\/div>\n
[1] 2866<\/code><\/div>\n
<\/div>\n
[oracle@dbvisitconsole observer]$ <\/code>ps<\/code> -ef | <\/code>grep<\/code> obser<\/code><\/div>\n
oracle\u00a0\u00a0\u00a0 2866\u00a0 2275\u00a0 0 14:25 pts<\/code>\/0<\/code>\u00a0\u00a0\u00a0 00:00:01 .<\/code>\/observersvc<\/code> start<\/code><\/div>\n
oracle\u00a0\u00a0\u00a0 2921\u00a0 2275\u00a0 0 14:29 pts<\/code>\/0<\/code>\u00a0\u00a0\u00a0 00:00:00 <\/code>grep<\/code> --color=auto obser<\/code><\/div>\n
[oracle@dbvisitconsole observer]$<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

After starting the observer we have to add the observer server. This is done from the MANAGE CONFIGURATION TAB from the MENU
\n\"\"<\/a><\/p>\n

From the Configuration TAB, choose the NEW on the left to add a dbvisit observer<\/p>\n

\"\"<\/a><\/p>\n

And then fill the informations. Note that the default passphrase for the observer is admin900 and then save
\n\"\"<\/a><\/p>\n

To monitor our configuration by the observer, let\u2019s click on Monitor
\n\"\"<\/a><\/p>\n

And then specify the poll interval and the number of retries before a failover happens. In our case<\/p>\n

The observer will monitor the configuration every 60 s and will retry 5 times if there is any error.
\nIf after 5 minutes (5×60 secondes), the probleme is not fixed, than an automatic failover will happen.<\/p>\n

\"\"<\/a><\/p>\n

The observer logfile is located on the observer server<\/p>\n

\n
\n\n\n\n
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\n
\n
[oracle@dbvisitconsole log]$ <\/code>pwd<\/code><\/div>\n
\/u01\/app\/dbvisit\/observer\/log<\/code><\/div>\n
[oracle@dbvisitconsole log]$ <\/code>ls<\/code> -l<\/code><\/div>\n
total 8<\/code><\/div>\n
-rw-r--r--. 1 oracle oinstall 1109 Jul 25 15:24 observer.log<\/code><\/div>\n
-rw-r--r--. 1 oracle oinstall\u00a0\u00a0 97 Jul 25 15:24 orcl_1_observer.log<\/code><\/div>\n
[oracle@dbvisitconsole log]$<\/code><\/div>\n
<\/div>\n
[oracle@dbvisitconsole log]$ <\/code>tail<\/code> -f orcl_1_observer.log<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:24:46 DDC: DDC<\/code>#1(orcl): Started watchdog: Watchdog successfully started monitoring<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Now let\u2019s break the primary database and normally a failover should happen after 5 minutes<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n<\/td>\n
\n
\n
[oracle@dbvisit1 log]$ <\/code>ps<\/code> -ef | <\/code>grep<\/code> pmon<\/code><\/div>\n
oracle\u00a0\u00a0\u00a0 1887\u00a0\u00a0\u00a0\u00a0 1\u00a0 0 14:03 ?\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 00:00:00 ora_pmon_orcl<\/code><\/div>\n
oracle\u00a0\u00a0 18199\u00a0 1733\u00a0 0 15:31 pts<\/code>\/0<\/code>\u00a0\u00a0\u00a0 00:00:00 <\/code>grep<\/code> --color=auto pmon<\/code><\/div>\n
[oracle@dbvisit1 log]$ <\/code>kill<\/code> -9 1887<\/code><\/div>\n
[oracle@dbvisit1 log]$ <\/code>ps<\/code> -ef | <\/code>grep<\/code> pmon<\/code><\/div>\n
oracle\u00a0\u00a0 18304\u00a0 1733\u00a0 0 15:32 pts<\/code>\/0<\/code>\u00a0\u00a0\u00a0 00:00:00 <\/code>grep<\/code> --color=auto pmon<\/code><\/div>\n
[oracle@dbvisit1 log]$<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

In the observer logfile we can see that the standby was promoted after 5 retries.<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n
10<\/div>\n
11<\/div>\n<\/td>\n
\n
\n
[oracle@dbvisitconsole log]$ <\/code>tail<\/code> -f orcl_1_observer.log<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:24:46 DDC: DDC<\/code>#1(orcl): Started watchdog: Watchdog successfully started monitoring<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:33:51 DDC: DDC<\/code>#1(orcl): rules failing (1\/5): primary: error on dbvisit1:7891: unexpected database status for DDC orcl: got: \"Database is down\", expected: \"Regular database open in read write mode\"<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:34:51 DDC: DDC<\/code>#1(orcl): rules failing (2\/5): primary: error on dbvisit1:7891: unexpected database status for DDC orcl: got: \"Database is down\", expected: \"Regular database open in read write mode\"<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:35:51 DDC: DDC<\/code>#1(orcl): rules failing (3\/5): primary: error on dbvisit1:7891: unexpected database status for DDC orcl: got: \"Database is down\", expected: \"Regular database open in read write mode\"<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:36:51 DDC: DDC<\/code>#1(orcl): rules failing (4\/5): primary: error on dbvisit1:7891: unexpected database status for DDC orcl: got: \"Database is down\", expected: \"Regular database open in read write mode\"<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:37:51 DDC: DDC<\/code>#1(orcl): rules failing (5\/5): primary: error on dbvisit1:7891: unexpected database status for DDC orcl: got: \"Database is down\", expected: \"Regular database open in read write mode\"<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:37:51 DDC: DDC<\/code>#1(orcl): configuration failed after 5 retries: primary: error on dbvisit1:7891: unexpected database status for DDC orcl: got: \"Database is down\", expected: \"Regular database open in read write mode\"<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:37:51 DDC: DDC<\/code>#1(orcl): watchdog shutting down: activation imminent<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:37:51 DDC: DDC<\/code>#1(orcl): ACTIVATION started: conditions for activation satisfied<\/code><\/div>\n
2019<\/code>\/07\/25<\/code> 13:38:41 DDC: DDC<\/code>#1(orcl): ACTIVATION successful: ACTIVATION OK: standby activated, activation took: 50.043794192s<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And we can verify that the standby is now open in read write mode<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n
10<\/div>\n
11<\/div>\n
12<\/div>\n
13<\/div>\n
14<\/div>\n
15<\/div>\n
16<\/div>\n
17<\/div>\n
18<\/div>\n
19<\/div>\n<\/td>\n
\n
\n
[oracle@dbvisit2 trace]$ sqlplus \/ as sysdba<\/code><\/div>\n
<\/div>\n
SQL*Plus: Release 19.0.0.0.0 - Production on Thu Jul 25 15:49:38 2019<\/code><\/div>\n
Version 19.3.0.0.0<\/code><\/div>\n
<\/div>\n
Copyright (c) 1982, 2019, Oracle.\u00a0 All rights reserved.<\/code><\/div>\n
<\/div>\n
<\/div>\n
Connected to:<\/code><\/div>\n
Oracle Database 19c Standard Edition 2 Release 19.0.0.0.0 - Production<\/code><\/div>\n
Version 19.3.0.0.0<\/code><\/div>\n
<\/div>\n
SQL> <\/code>select<\/code> db_unique_name,open_mode from <\/code>v<\/code>$database;<\/code><\/div>\n
<\/div>\n
DB_UNIQUE_NAME\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OPEN_MODE<\/code><\/div>\n
------------------------------ --------------------<\/code><\/div>\n
orcl\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 READ WRITE<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Note that we can use a user defined script with the observer. For more information please see dbvisit documentation<\/p>\n","protected":false},"excerpt":{"rendered":"

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