oracle rac delete
Oracle RAC is a scalable data management system that utilizes multiple Oracle instances running on different servers to provide high availability and high-performance data management solutions. However, in the process of using Oracle RAC, there may be situations where Oracle RAC needs to be deleted. The following will describe the deletion method of Oracle RAC in detail.
First of all, before deleting Oracle RAC, you need to back up the database and ensure the recoverability of the backup. In addition, you need to uninstall the Oracle software on the operating system and delete all files and directories of Oracle RAC.
- Stop the Oracle RAC service
Before deleting Oracle RAC, you need to stop the Oracle RAC service. You can use the command crsctl stop crs to stop the Oracle RAC service.
- Delete OCR and Voting Disk
In Oracle RAC, OCR (Oracle Cluster Registry) and Voting Disk are very important components. Before deleting Oracle RAC, you need to delete OCR and Voting Disk first. You can use the following command to delete OCR and Voting Disk:
$ crsctl delete css votedisk $ crsctl delete css ocr
Before deleting OCR and Voting Disk, you need to move these components to the storage area and back up these components.
- Delete CRS
Before deleting Oracle RAC, you also need to delete CRS (Cluster Ready Services). You can use the following command on each node to delete CRS:
$ /u01/app/11.2.0/grid/crs/install/roothas.pl -deconfig -force
Before using the above command to delete CRS, you need to ensure that all nodes have exited the Oracle RAC cluster.
- Uninstall Oracle software
Before deleting Oracle RAC, you also need to uninstall the Oracle software on the operating system. You can use the following command to uninstall Oracle software:
$ ./runInstaller -silent -detachHome ORACLE_HOME="ORACLE_HOME"
When uninstalling Oracle software, you need to first ensure that the Oracle service has been stopped on each node, and the Oracle software version to be uninstalled corresponds to the number of nodes.
- Delete Oracle RAC files and directories
Before deleting Oracle RAC, you also need to delete all files and directories of Oracle RAC. You can use the following command to delete Oracle RAC files and directories:
$ rm -rf /u01/app/
It should be noted that before deleting Oracle RAC files and directories, these files and directories need to be backed up, and after deletion, the operating system needs to be optimized .
Generally speaking, the deletion process of Oracle RAC is relatively complicated and needs to be done with caution. Before performing the deletion operation, be sure to back up the database and delete it according to the above steps. At the same time, after removing Oracle RAC, the operating system needs to be optimized to improve system performance and availability.
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