Oracle Database Administration from Zero to Hero - Shrinking Segments (Part 1 of 2)

This video tutorial covers the concepts of Row ID and segment defragmentation in Oracle databases. It explains the structure and significance of Row IDs, their role in database indexing, and how they facilitate quick data retrieval. The tutorial also delves into segment defragmentation, discussing its importance in optimizing database performance by reducing disk space waste and improving processing efficiency. Various methods for defragmentation, including shrinking segments and deallocating unused space, are explored, highlighting their benefits and potential issues.

What is the purpose of the Row ID pseudo column in a database segment?

Explain the significance of the fixed format and fixed length of Row ID values.

How does the Row ID structure ensure uniqueness within segment rows?

Explain the role of indexes in relation to Row IDs.

What are the disadvantages of having empty space within segment blocks?

What actions are involved in ideal defragmentation of a segment?

Describe the process and benefits of segment defragmentation.

What happens to the high watermark during the shrinking of a segment?

How does the Oracle database handle the locking of tables during the shrink command?

What is the difference between shrinking a segment with and without the compact option?