Retrieve the DATABASE IDENTIFIER from datafiles or online logs

This article is about the steps which require recovery when we retrieve the DATABASE IDENTIFIER dumping it from datafiles or online and archived redo logs . DBID stands for database identifier, which is a unique identifier for each Oracle database running. It is found in control files as well as datafile header. If the database is open […]

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Restore from a loss of a subset of the current control files

Oracle database without control file is just like a human body without a backbone. Control file plays the role of the backbone of the database . Being an oracle dba we must know about controlfile . The control file is a file that the Oracle DBMS maintains to manage the state of the database, and it is […]

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Recover from a loss of all redo log members of the CURRENT group

The most crucial and vital structure for recovery operations is the online redo log, which consists of two or more pre-allocated files that store all changes made to the database as they occur. Every instance of an Oracle database has an associated online redo log to protect the database in case of an instance failure. […]

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Recover from a loss of all redo log members of an ACTIVE group

In the last post, we have learned about multiple kinds of a recovery scenario. Now in this article, we are going to learn about the steps which are used How to recover from a loss of all redo log members of an ACTIVE group.  As we all know what is active group ACTIVE status means that there are […]

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Recover from a loss of all redo log members of an INACTIVE group

We all know that redo log has three kinds of a group like active, inactive, current. They all have different use and as well as different meaning.Let’s simulate a loss of all redo log members of an inactive group. If you have completely lost one redo log group your database won’t be able to open. […]

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Recover from a loss of the SYSTEM tablespace on different location

This post is about the steps used for recover as from a loss of the SYSTEM tablespace on a different location. As DBA we all are aware of system tablespace that it always contains the data dictionary tables for the entire database. In particular, this example will restore the lost tablespace to another location, just […]

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RMAN Configure Backup Optimization Features with Example

RMAN backup optimization is another feature to minimize backup size. Enabling this feature, RMAN BACKUP will skip backup of files that comes in certain condition or exactly identical to the file already backup up. As the name indicates the feature is for optimizing the RMAN backups. When you turn on this backup optimization parameter, RMAN […]

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