How to configure Logminer in oracle step by step

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LOGMINER :-

Logminer is a utility provided with the Oracle database server which mines the redologs or Archivelogs and data dictionary information to build the SQL statements and keeps the contents of the redolog file in the fixed view called ” V$logmnr_contents “.
LogMiner tool can help the DBA to the find changed records in redo log files by using a set of PL/SQL procedures and functions .
Internally Oracle uses the Log Miner technology for several other features,such as Flashback Transaction Backout,Streams, and Logical Standby Databases .Most often LogMiner is used for recovery purpoRead more

How To Downgrade Oracle 19c Grid To 12c Grid

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In the pervious article we have explained the Upgrade Grid Infrastructure 12c To 19c Oracle Now We will explain the steps for downgrade oracle 19c 2 node GRID to oracle 12.1.0.2 GRID.

ENVIRONMENT DETAILS:
2 NODES – localhost1 and localhost2
Grid owner – oracle
19C ORACLE_HOME(current) – > /sharearea/crs/grid19c
12C ORACLE_HOME (old) -> /crs/app/oracle/product/grid12c

1. Check the current grid version:( check on both the nodes)

oracle@localhost1:/$ crsctl query crs softwareversion
Oracle Clusterware version on node [dbhost1] is [19.0.0.0.0]
oracle@localhost1:$ crsctl 
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Upgrade Grid Infrastructure 12c To 19c Oracle

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The latest oracle version is oracle 19C . In the below article we will explain the steps for upgrading grid infrastructure to 19c from oracle 12c . The upgrade will be done in rolling mode.

Current configuration – >

No of nodes – 2 node
current version – 12.1.0.2
os platform – Linux
grid owner – oracle

Check software version :
oracle@node1~$ crsctl query crs activeversion
Oracle Clusterware active version on the cluster is [12.1.0.2.0]

oracle@node2~$ crsctl query crs softwareversion
Oracle Clusterware version on node node1 is [12.1.0.2.0]

2. Download the software and unzip on your first Read more

Configuration GRID/ASM for single instance using UDEV

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Configuration GRID/ASM for single instance using UDEV

UDEV Linux configuration:

What I’m preparing in the background is a RAC installation using two virtual machine running under VirtualBox. For this I have attached to my first virtual machine four fixed size of 1GB disks like this

 

To attach those disks in another virtual machine go to Virtual Media Manager and change their property to shareable like this

udev02

Once you start your guest OS you should see something:

[root@localhost ~]# fdisk -l
.
.
.
Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors
Units = sectors of 1 * 512 = 5
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How to Install Grid/ASM for Single Instance on Oracle cloud:

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 How to install Grid/ASM for single instance on cloud:

First open the browser any browser and type oracle cloud.

And sign-in your Oracle cloud
And select the three-line bar beside Oracle cloud.

And Select the option of Bare metal and VM and Exa data

After selecting that the next step is select Create DB system
1. Select a compartment name which is you want to provide
Name your DB system which is you want to provide
Select an availability domain
Select a shape type which is virtual machine
Select a shape vm standard 2.2 2 Available Core Count, 1 Node Count which are basic if you want u can change

 

&n… Read more

Installation of 18c oracle binaries and Database at same time

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In this Article you will se how to install oracle 18c binaries as well as Database

Step 1 :
Disable firewall and selinux:
first check the status of firewalld status weather is active or not:

[root@localhost /]# systemctl status firewalld
● firewalld.service – firewalld – dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2021-05-03 01:47:30 IST; 4h 12min ago
Docs: man:firewalld(1)
Main PID: 957 (firewalld)
Tasks: 2
CGroup: /system.slice/firewalld.service
└─957 … Read more

How to download Oracle 11g & 12c

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How to download Oracle 11g & 12c Database software and create your 1st Oracle Database

Things to Do:

  • Make sure your laptop has minimum 8 GB of RAM (16 GB or more is recommended).
  • Downloads: 7-zip to unzip, Notepad++ for writing notes.
  • Register at OTN: https://www.oracle.com/technetwork/index.html – this is a must to download Oracle software.
  • We’ll be installing Oracle Enterprise Edition, NOT Standard Edition or any other editions :Download & Inst
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Oracle & +++

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