Oracle Interview Questions and Answers Pdf Free Download - 1
What is the difference between database and instance?
Database is the collection of data files that contain the information of interest; whereas instance is the combination of background processes and memory structure.
What are the disk components?
Data files, Redo Logs, Control files, Password files and Parameter files are the disk components.
What is Database Writer (DBWR)?
DBWR is a background process that writes changed data blocks from buffer cache to the data file. The changed data blocks are called dirty blocks.
What do you mean by data consistency?
Data consistency provides a stable or consistent data to the users throughout the session.
Data consistency is maintained through rollback segments.
A rollback statements holds the data image before change; therefore, one or more session will get the same image of the data throughout the session that were reading the data while another session is updating.
What are the components of SGA?
SGA is used to store shared information. It includes Buffer cache, Log buffer, Shared poll, Large Pool and Java pool.
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