In Oracle 19c, managing deferred segment creation is vital for optimizing database performance and storage efficiency. This guide delves into the key aspects of Deferred Segments Creation and Segment Creation, offering detailed steps and best practices for effectively handling these tasks.
Deferring Process
Deferring segments allows postponing physical segmts creation until inserting data into the tables. This approach can significantly save storage space and improve database performance.
Key Features of Deferred Segments
- Storage Efficiency: Saves storage space by delaying segment creation until necessary.
- Improved Performance: Reduces unnecessary I/O operations by avoiding the creation of empty segments.
- Flexibility: Facilitates more dynamic and efficient space management.
📢 You might also like: Oracle 19c Using Space-Saving Features (Category: Oracle Database Admin)
Steps to Defer Segments
To defer segmts creation in Oracle 19c, follow these steps:
Enable Deferred Segment Creation
Set the DEFERRED_SEGMENT_CREATION initialization parameter to TRUE.
ALTER SYSTEM SET deferred_segment_creation = TRUE SCOPE=BOTH;
Create Tables with Deferred Segments
When creating new tables, segments will be deferred by default if the initialization parameter is set.
CREATE TABLE table_name (column1 datatype, column2 datatype);
Insert Data to Trigger Segment Creation
Segments are created when data is inserted into the table.
INSERT INTO table_name (column1, column2) VALUES (value1, value2);
Check Segment Creation
Verify the segmts creation using the DBA_SEGMENTS view.
SELECT segment_name, tablespace_name FROM dba_segments WHERE segment_name = 'table_name';
Benefits of Def Segments Creation
- Storage Optimization: Saves storage by not creating segments until data is inserted.
- Performance Boost: Reduces the overhead of creating segments for empty tables.
- Cost Efficiency: Lowers storage costs by deferring unnecessary segment creation.
Segment Creation
Segment creation is a critical task in database management, ensuring the proper allocation of tables and indexes within the database.
Key Features of Segment Creation
- Space Allocation: Allocates space for tables, indexes, and other database objects.
- Performance Management: Ensures optimal performance by correctly sizing segments.
- Scalability: Supports database growth by efficiently managing segmts creation.
Steps to Create Segments
Deferred segmts Creation – To create segments in Oracle 19c, follow these steps:
Create Tables with Immediate Segment Creation
Set the initialization parameter DEFERRED_SEGMENT_CREATION to FALSE if you want immediate segment creation.
ALTER SYSTEM SET deferred_segment_creation = FALSE SCOPE=BOTH;
Create Tables
When creating new tables, segments are created immediately if the initialization parameter is set to FALSE.
CREATE TABLE table_name (column1 datatype, column2 datatype);
Allocate Additional Space
Allocate additional space to segments as needed.
ALTER TABLE table_name ALLOCATE EXTENT;
Check Segment Space Usage
Monitor the space usage of segments using the DBA_SEGMENTS view.
SELECT segment_name, bytes, blocks FROM dba_segments WHERE segment_name = 'table_name';
Monitoring Segment Creation
Monitor segment creation activities using dynamic performance views such as DBA_SEGMENTS and V$SESSION. These views provide insights into segment space usage and help identify potential issues.
Example query to monitor space usage:
SELECT segment_name, tablespace_name, bytes, blocks FROM dba_segments WHERE segment_name = 'table_name';
Conclusion
Oracle 19c’s capability to defer and manage segments creation is crucial for maintaining optimal database performance. By leveraging these tools and strategies, database administrators can enhance SQL performance, ensure efficient resource utilization, and proactively address performance issues. Effective management of these processes will help maintain a robust and efficient Oracle 19c environment.
Regular monitoring, proactive management, and continuous learning are essential components of effective database administration. By adopting these practices, organizations can ensure that their Oracle 19c databases operate at peak efficiency, delivering reliable performance even under varying workloads.
See more on Oracle’s website!
Be Oracle Database Certified Professional, this world is full of opportunities for qualified DBAs!
