Real Application Clusters (RAC)

How to Build 12c RAC (0/6) - An Overview

by Ed Chen
September 18, 2015January 17, 2021

If you want a conventional RAC environment, it's almost the same as 11g RAC on the entire infrastructure. Logically, there're at least three components that… Read More »

How to Build SSH Equivalency Between Two Servers

by Ed Chen
September 3, 2015December 11, 2022

In this post, we will introduce two kinds of ways to build user's SSH equivalency. Both methods are good. Manual establishing can make your know… Read More »

How to Resolve INS-30502 No ASM disk group found

by Ed Chen
August 14, 2015August 5, 2020
4 Comments

This error is quite strange and thrown during grid infrastructure installation.INS-30502 No ASM disk group found.Why can not oracle access any ASM disk groups? How can it… Read More »

How to Configure BIND Named Service on Enterprise Linux 7

by Ed Chen
August 6, 2015August 5, 2020

Since we are running on CentOS 7.1 Minimal which has no default named service, so we need to install it either by yum install bind… Read More »

Oracle Undo Tablespace Usage

by Ed Chen
May 28, 2014February 2, 2022
2 Comments

The first purpose of using UNDO is for storing all uncommitted data in case we need to undo uncommitted data in rollback or after system… Read More »

ORA-29740 in Cluster Databases

by Ed Chen
March 6, 2013May 22, 2022

ORA-29740 ORA-29740 is an error message only for cluster databases, which indicates that an instance of the cluster is evicted by another member. It could… Read More »

Duplicate a Standby Database (1/4) - With Active Database

by Ed Chen
January 27, 2013December 11, 2022

Duplicate a Standby Database (0/4) - An Overview For 19c Standby database duplication, you may check the post: How to Duplicate a 19c Physical Standby… Read More »

Why Does Data Guard Broker Restart Only One Instance in RAC

by Ed Chen
December 10, 2012August 5, 2020

One of common database architectures on enterprise-level is to integrate both RAC and Data Guard technologies, one RAC is for primary, the other RAC is… Read More »

How to Resolve ORA-12537:TNS:connection closed

by Ed Chen
November 8, 2012December 11, 2022
6 Comments

ORA-12537 Overview There're several possible causes to raise ORA-12537: Incorrect File Permission White or Black List ORA-12537 Caused by Incorrect File Permission Incorrect file permission… Read More »

How RAC DB Auto Start after Reboot

by Ed Chen
November 7, 2012July 4, 2022

There're two sections that you have to configure in order to automatically start a RAC database after system reboots. RAC Level Grid Level A. RAC… Read More »