INTERVIEW QUESTIONS ORACLE MEMORY MANAGEMENT DETAILS

Question: List the factors that can affect the accuracy of the estimations?

Answer: The space used transaction entries and a deleted record does not become free immediately after completion due to delayed cleanout.
Trailing nulls and length bytes are not stored. Inserts of, updates to and deletes of rows as well as columns larger than a single datablock, can cause fragmentation and chained row pieces.

The space used transaction entries and a deleted record does not become free immediately after completion due to delayed cleanout.
Trailing nulls and length bytes are not stored. Inserts of, updates to and deletes of rows as well as columns larger than a single datablock, can cause fragmentation and chained row pieces. Source: CoolInterview.com

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