Cluster Ready Services (CRS)

How to Resolve CRS-4640: Oracle High Availability Services is already active

by Ed Chen
March 7, 2023February 15, 2023

CRS-4640 We observed that osysmond.bin was taking too much memory and the usage of SWAP was increasing. At this moment, to prevent the server from… Read More »

How to Resolve CRS-4405: The following nodes are unknown to Oracle High Availability Services

by Ed Chen
August 1, 2022December 15, 2022

CRS-4405 Tried to check the status of a specific server by crsctl check cluster, but it failed with CRS-4405. [grid@primary01 ~]$ crsctl check cluster -n… Read More »

How to Resolve Opatchauto Failed with Error Code 42

by Ed Chen
October 14, 2020February 13, 2023

Before reading this post, please refer to the known issues in the README document of your patch first, maybe you can find a solution there.… Read More »

How to Restore 10g RAC Database from a Backup Set

by Ed Chen
June 26, 2019December 10, 2022
2 Comments

For 12c RAC database restoration, you may check: How to Restore 12c RAC Database from a Backup Set. Suppose we have recovered 10g CRS and… Read More »

How to Build 18c RAC - 1 of 4 - Preparing Two Database Servers

by Ed Chen
December 15, 2018February 13, 2023
4 Comments

For 19c, you may refer to: How to Build 19c RAC - 1 of 4 - Preparing Two Database Servers. Network Design for RAC Let's… 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 »