Cloud Control: the Graph in the Performance Top Activity view shrinks to left

Some time I have the problem with the vies of the Top Activity Page in the Cloud Control:

The Graf shrink to left and you can see only the part of the picture:

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KVM Virtualization on top of the vmware workstation 12 guest vm‘s

Kernel-based Virtual Machine (KVM) provides a possibility to use the Oracle (or Redhat/CentOS) Linux kernel as a hypervisor.

In my example, I will configure the KVM virtualization on top of the guest vm running OEL 7.4. The guest VM is running on top of the VMWare Workstation 12.

To enable the virtualization layer select VM settings and navigate to the Processor settings. Enable the setting „Virtualize Intel VT-x/EPT or AMD-V/RVI.“

The Guest VM is now enabled for the using of the nested virtualization (such kvm). Start the Guest VM.

Install and configure KVM virtualization on the OEL 7.4 Linux

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Extend Filesystem /u01 on an Exadata ComputeNode

Do you know the problem: an Exadata does not have enough space in filesystem /u01? The Exadata has the locale storage and you can increase /u01.


1. Check filesystem and associated volume:

[root@myexadb01]# df -h

Filesystem                      Size    Used    Avail    Use%    Mounted on
/dev/mapper/VGExaDb-LVDbSys1     30G    23G    5.7G    80%    /
tmpfs                           757G    4.0K    757G    1%    /dev/shm
/dev/sda1                       488M    48M    405M    11%    /boot
/dev/mapper/VGExaDb-LVDbOra1    158G    107G    43G    72%    /u01

Check the free space in the volume group:

[root@myexadb01]# pvs
PV         VG        Fmt    Attr    PSize    PFree
/dev/sda2    VGExaDb   lvm2   a—u     1.63t    1.38t

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Steps to configure Oracle Data Guard 12.2 for non-multitenant database

This document describes the configuration of the Oracle Data Guard Version 12.2. We will configure a standby for a non-multitenant database.

Our test environment consists of two Linux (OEL 7.3) servers: oradg1 and oradg2. I already created the non-multitenant database on the server oradg1. We will configure the standby database on the server oradg2. We will use a new feature of 12.2 by creating a physical standby via dbca – oracle database creation assistant.

Environment overview:

Primary server name/os: oradg1/Oracle Linux Server 7.3 (64 bit)

Standby server name/os: oradg2/Oracle Linux Server 7.3 (64 bit) 

RDBMS Version (primary and standby): 

ORACLE_HOME (primary and standby): /u01/app/oracle/product/12.2.0/dbhome_1 



Listener name/port (primary and standby): LISTENER/1521 

Path to DB files (primary and standby): /u01/app/oracle/oradata/orcl1 

Recovery area (primary and standby): /u01/app/oracle/fast_recovery_area/orcl1


Preparing the primary database

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