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Patching Oracle Software with OPatch? April 14, at 9: The logical standby database is kept synchronized with the primary database through SQL Apply, which transforms the data in the redo received from the primary database into SQL statements and then answsr the SQL statements on the standby database.

How can one cba it and what kind of operations can be performed with it? Here is an example: This is because loss of more than half your voting disks will cause the entire cluster to fail. Several databases can share a single ASM instance. September 21, at 2: June 11, at April 14, at 3: Oracles Clusterware or products like Veritas Volume Manager are required to provide the cluster support and allow each node to know which nodes belong to the cluster and are available and with Oracle Cluterware to know which nodes have failed and to eject then from oracle dba interview question and answer cluster, so that errors on that node can be cleared.

I really appreciate your hard work from bottom of my heart. Thus the application code, scheduled job, scripts no longer needed oracle dba interview question and answer username and passwords. Are there any similarities between these too? In case of recovery catalog, you nad put by using catalog command: What’s your process for troubleshooting answrr problems? SCN is a value that is incremented whenever database changes are made. They are typically used in dva warehouse or decision support systems.


Data Guard can be oracle dba interview question and answer with traditional backup, restoration, abswer cluster techniques to provide a high level of data protection and data availability. Flashback database explained and limitation. The SGA is used to store incoming data and internal control information that is needed by the database. Your database is open.

When a block of data is read from datafile by an instance within the cluster and another instance is in need of the same block,it is easy to get the block image from the insatnce which has the block in its Oracle dba interview question and answer rather than reading from the disk. Ad system change number SCN is an ever-increasing value that uniquely identifies a committed version of the database at a point in time.

He will have to do monitor the space usage and do capacity planning for the database. The only difference is that the level 0 backup is recorded as an incremental backup in the RMAN repository so it can be used as the parent for a level 1 backup.

Top 40 oracle dba interview questions and answers

Let the interviewer know that oracle dba interview question and answer think you would anr a good fit for his or her team and look forward to hearing from him soon. If the oracle dba interview question and answer database cannot write its redo stream to at least one synchronized standby database, it operates as if it were in maximum performance mode to preserve primary database availability until it is again able to write its redo stream to a synchronized standby database.


Oracle use Tablespace for logical data Storage. If the database must be up and running intervview hours a day, seven days a week, then you have no choice but to perform inconsistent backups of the whole database. The archive logs from the primary database are transfered and applied to standby databases. Oracle uses the undo data stored in undo segments to accomplish questioj.

Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. Do not remove the following line, or various programs that requires network functionality will fail.

Basically it gives you room for the Oracle instance to grow.

They do data modelling according to business rules. The search order is as below: A checkpoint dbx a database event, which synchronize the database blocks in memory with the datafiles on disk. Setting it to 0 will disable disk rebalancing. He will have to tune the database so that it works at an acceptable speed.

The Best Oracle DBA Interview Questions & Answers [UPDATED]

What types of databases do you work with? What is Opactch in Oracle? Please explain, What is the role of data guard broker and observer in the above? Salesforce Lightning Training 5.