Month: May 2020

How to Configure OMS to Connect to Repository Database with Standby Database

This post demonstrates how to configure database connection string for OMS to connect to repository database, which has a data guard standby database.  The purpose is to make sure OEM is still functioning after database has been switched or failed over to data guard physical standby database.

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Restart all OMS

[oracle@oemnode1 ~]$ emctl stop oms -all
[oracle@oemnode1 ~]$ emctl start oms

Switch Over Repository Database to Standby Database

DGMGRL> show configuration;

Configuration - dg_oemrep

Protection Mode: MaxPerformance
Members:
oemrep - Primary database
stboemrep - Physical standby database

Fast-Start Failover: DISABLED

Configuration Status:
SUCCESS (status updated 27 seconds ago)
DGMGRL> switchover to stboemrep;
Performing switchover NOW, please wait...
Operation requires a connection to database "stboemrep"
Connecting ...
Connected to "STBOEMREP"
Connected as SYSDBA.
New primary database "stboemrep" is opening...
Operation requires start up of instance "OEMREP" on database "oemrep"
Starting instance "OEMREP"...
Connected to an idle instance.
ORACLE instance started.
Database mounted.
Connected to "OEMREP"
Switchover succeeded, new primary is "stboemrep"
DGMGRL>

Check and Confirm OEM 13c  is Still Working

How to Setup Data Guard Physical Standby in Oracle Database 18c

This post applies to 12c and 19c as well, it introduced two popular ways for creating a standby database: RMAN DUPLICATE and from primary database backup

Introduction

This post demonstrates how to build an Oracle 18c physical standby database managed by data guard.  The method should also apply to 12c and 19c as well.

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DUPLICATE FROM ACTIVE DATABASE Fails With RMAN-03009 ORA-17628 ORA-19505

While creating a new physical standby database by using RMAN duplicate command, the following errors occur:

RMAN> run {
allocate channel prim1 type disk;
allocate channel prim2 type disk;
allocate auxiliary channel standby1 type disk;
DUPLICATE TARGET DATABASE
FOR STANDBY
FROM ACTIVE DATABASE
...
..
.
RMAN-03009: failure of backup command on prim2 channel 
ORA-17628: Oracle error 19505 returned by remote Oracle server
ORA-19505: failed to identify file ""

SOLUTION

  1. Check and remove the old standby database data files.
  2. Make sure directories for standby database data files created and accessible.

network unreachable resolving ‘./NS/IN’ or ‘./DNSKEY/IN’

While checking named status on Oracle Linux, the following warnings occur:

# systemctl status named
..
.
May 17 20:40:59 HOSTNAME named[8468]: network unreachable resolving './NS/IN': 2001:500:1::53#53
May 17 20:40:59 HOSTNAME named[8468]: network unreachable resolving './DNSKEY/IN': 2001:500:2d::d#53
..
.

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How to Uninstall OEM 13c Old OMS Home

Firstly uninstall Oracle Management Agent by referring to post How to Deinstall OEM Agents in Oracle Enterprise Manager 13C

After OMS central agent is uninstalled, now it is time to deinstall OMS home:

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