Managing Oracle clusterware (OCR)

Managing Oracle clusterware (OCR)

Oracle Clusterware places the configuration information of the entire cluster on shared storage. The information includes the list of cluster nodes, the ing between cluster database instances and nodes, and the CRS Application resource information. The storage location is on the OCR Disk. in the entire cluster, only one Node can perform read and write operations on the OCR Disk. This Node is called the Master Node and all nodes will keep an OCR copy in the memory, at the same time, an OCR Process reads content from this memory. When the OCR content changes, the OCR Process of the Master Node is responsible for synchronizing the OCR Process to other nodes.

If you already mirror the OCR, then you do not need to add an OCR location; Oracle automatically manages two OCRs when it mirrors the OCR. Oracle RAC environments do not support moreTwo OCRs, a primary OCR and a second OCR.

[SQL]

1. -- Ocrconfig syntax
2. [Root @ rac1 ~] # Ocrconfig-help
3. Name:
4. Ocrconfig-Configuration toolForOracle Cluster Registry.
6. Synopsis:
7. Ocrconfig [Option]
8. Option:
9. -Export <filename> [-s online]
10. -Export cluster register contentsToA file
11. -Import <filename>-Import cluster registry contentsFromA file
12. -Upgrade [<User> [<Group>]
13. -Upgrade cluster registryFromPrevious version
14. -Downgrade [-version <version string>]
15. -Downgrade cluster registryToThe specified version
16. -Backuploc <dirname>-Configure periodic backup location
17. -Showbackup-Show backup information
18. -Restore <filename>-RestoreFromPhysical backup
19. -ReplaceOcr | ocrmirror [<filename>]-Add/Replace/Remove a OCR device/file
20. -Overwrite-Overwrite OCR configurationOnDisk
21. -Repair ocr | ocrmirror <filename>-RepairLocalOCR configuration
22. -Help-PrintOutThis help information
24. Note:
25. A log file will be createdIn
26. $ ORACLE_HOME/log/
27. You have file creationPrivileges InThe above directory before
28. Running this tool.

Automatic OCR backup
-Every 4 hours: CRS retains the last 3 copies.
-At the end of each day: CRS retains the last two copies.
-At the end of each week: CRS retains the last two copies.
Automatic Backup is completed by the Master Node CRSD process. The default backup location is under the $ CRS_HOME/crs/cdata/<cluster_name> directory, you can use the ocrconfig-backuploc <directory_name> command to modify the directory.

Example:

[SQL]

1. -- Display backup information
2. [Root @ rac1 ~] # Ocrconfig-showbackup
4. Rac1 20:45:32/u01/crs1020/cdata/crs
6. Rac1 16:45:47/u01/crs1020/cdata/crs
8. Rac1 22:18:40/u01/crs1020/cdata/crs
10. Rac1 16:45:47/u01/crs1020/cdata/crs
12. Rac1 16:45:47/u01/crs1020/cdata/crs
13. [Root @ rac1 ~] # Ll/u01/crs1020/cdata/crs/
14. Total 28296
15. -Rw-r-- R -- 1 root 4816896 Feb 20 20:45 backup00.ocr
16. -Rw-r-- R -- 1 root 4816896 Feb 19 16:45 backup01.ocr
17. -Rw-r-- R -- 1 root 4816896 Feb 18 22:18 backup02.ocr
18. -Rw-r-- R -- 1 root 4816896 Feb 20 20:45 day _. ocr
19. -Rw-r-- R -- 1 root 4816896 Feb 19 16:45 day. ocr
20. -Rw-r-- R -- 1 root 4816896 Feb 19 16:45 week. ocr
22. -- Change the backup location
23. [Root @ rac1 ~] # Ocrconfig-backuploc/oracle/backup/ocr

Use physical backup to restore OCR
1. Find the physical backup:
$ Ocrconfig-showbackup
2. Check its content:
# Ocrdump file_name-backupfile
3. Stop Oracle Clusterware on all nodes:
# Crsctl stop crs
4. Restore OCR physical backup:
# Ocrconfig-restore <crs home>/cdata/jfv_clus/day. ocr
5. Restart Oracle Clusterware on all nodes:
# Crsctl start crs
6. Check OCR integrity:
$ Cluvfy comp ocr-n all
Example:

[SQL]

1. -- Find physical backup:
2. [Root @ rac1 ~] # Ocrconfig-showbackup
4. -- Check its content. dump fails:
5. [Root @ rac1 crs] # ocrdump-backupfileDay. Ocr
6. PROT-302: FailedToInitialize ocrdump
8. -- Stop Oracle Clusterware on all nodes:
9. [Root @ rac2 ~] # Crsctl stop crs
10. [Root @ rac1 ~] # Crsctl stop crs
12. -- Restore OCR physical backup:
13. [Root @ rac1 ~] # Ocrconfig-restore/u01/crs1020/cdata/crs/backup00.ocr
14. -- Restart Oracle Clusterware on all nodes:
15. [Root @ rac2 ~] # Crsctl start crs
16. [Root @ rac1 ~] # Crsctl start crs
18. -- Check OCR integrity:
19. RACDB1 @ rac1/home/oracle $ cluvfy comp ocr-nAll

Manual backup OCR
The optical character recognition (OCR) should be automatically backed up to other storage devices every day:
-Use the preferred backup tool.
Logical backup of OCR should be performed before and after major changes:
# Ocrconfig-export file name
Make sure that the OCR backup that matches the current system configuration is restored.

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