Block corruptions are one of the common source of database outages. A database block is corrupted when its content has changed from what Oracle Database expects. Correcting block corruptions can prove to be a lengthy and costly exercise and requires good expertise 0n the DBA part.
Block Corruption can happen at Logical level or Physical level. Also, such corruption can impact a single block or huge number of blocks in the database.
5 CommentsIn one of our database where GoldenGate setup is done, RMAN process was not able to delete the archive logs. The error message that coming…
Leave a CommentDuring one of our 11gR2 database restore activity we found below error message in the RMAN “duplicate database command”
channel aux4: ORA-19870: error while restoring backup piece /oraclone/ORCL/rman_clone/ORCL_F_20170605_c1s60alv_1_1 ORA-19504: failed to create file "+DATA3" ORA-15045: ASM file name '+DATA3' is not in reference form ORA-17502: ksfdcre:5 Failed to create file +DATA3 ORA-15081: failed to submit an I/O operation to a disk ORA-27091: unable to queue I/O ORA-27041: unable to open file SVR4 Error: 13: Permission denied1 Comment
RMAN performs backup and recovery tasks on the databases and automates administration of the backup strategies. It greatly simplifies backing up, restoring, and recovering database files.…
11 CommentsEvery Oracle Database has a control file as one of its important file. It is a small binary file that records the physical structure of the database.
The control file includes:
– Database name
– Names and locations of associated datafiles and redo log files
– The timestamp of the database creation
– The current log sequence number
– Checkpoint information
To work with RMAN, you must configure several things, which can be default backup type (disk or tape), the number of channels you want to use, and the degree of parallelism.
When you are testing it on your personal system, you probably can get by with RMAN’s default configuration settings. However, for production jobs involving sophisticated backup strategies, you need to customize RMAN’s configuration settings to fulfill all your requirement. You can configure different backup retention policies, for example, for different databases.
Leave a CommentYou can grant a user restricted access to the base recovery catalog by granting that user read/write access only to that user’s RMAN metadata, also…
1 CommentIt is always recommended to have the recovery catalog to store RMAN related information. In absence of recovery catalog RMAN stores the information in the…
Leave a CommentThe main background processes which are related to Backup & Recovery process are : A) THE CHECKPOINT PROCESS B) THE LOG WRITER PROCESS C) THE ARCHIVER…
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