INTERVIEW QUESTIONS ORACLE DETAILS

Question: Name the stages of processing a DML statement. What stages are part of processing a query?

Answer: When processing a query or select statement, the parsing operation occurs first, followed by the fetch operation and the execute operation. However, when processing a DML statement, the parse operation is conducted as well as the execute operation, but not the fetch operation.

When processing a query or select statement, the parsing operation occurs first, followed by the fetch operation and the execute operation. However, when processing a DML statement, the parse operation is conducted as well as the execute operation, but not the fetch operation.

Source: CoolInterview.com

when processing a DML statement, the parse operation is conducted as well as the execute operation and fetch operation also, because update requires select first. Fetch the data from disk to Database bauffer cache then updates the table with new data. server process is responsible to intimate DBWn to update corresponding datafiles. It keeps previous or before image in undo tablespace for read consistancy Source: CoolInterview.com

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