In Oracle 19c, deploying space management features is crucial for optimizing database performance and efficiency. These techniques not only help manage space effectively but also ensure smooth database operations. This guide explores various space management techniques and their impact on storage optimization. Implementing these features will enhance your database’s efficiency and reduce storage costs. Moreover, understanding these techniques will help in the effective deployment of space management.
Space Management
Effective space management is essential for maintaining database health and performance.
Key Features of Space Management
- Segment Shrinking: Reclaims unused space within segments.
- Compression: Reduces the storage footprint of database objects.
- Deduplication: Removes duplicate data to save space.
Deploy Space Management – Segment Shrinking
Segment shrinking is a vital space management feature that helps reclaim fragmented space within database segments.
Enable Segment Shrinking
To enable segment shrinking on a table:
ALTER TABLE table_name SHRINK SPACE;
Benefits of Segment Shrinking
- Optimized Storage: Reclaims unused space, optimizing storage usage.
- Improved Query Performance: Reduces the amount of data scanned during queries, enhancing performance.
- Cost Savings: Lowers storage costs by efficiently managing available space.
Compression
Compression is another essential feature for space optimization in Oracle DBs.
Enable Compression
To enable compression on a table:
ALTER TABLE table_name COMPRESS FOR OLTP;
Benefits of Compression
- Reduced Storage Requirements: Saves disk space by compressing data.
- Improved Performance: Enhances query performance by reducing I/O operations.
Deduplication
Deduplication removes redundant data, freeing up valuable storage space.
Deploy Space Management – Perform Deduplication
Use the following query to identify and remove duplicate rows:
DELETE FROM table_name
WHERE rowid NOT IN (
SELECT MIN(rowid)
FROM table_name
GROUP BY column1, column2, ...);
Benefits of Deduplication
- Storage Efficiency: Reclaims space by removing duplicates.
- Data Integrity: Ensures that each piece of data is unique, reducing redundancy.
Storage Optimization
Storage optimization techniques focus on maximizing the efficient use of available storage resources.
Key Techniques for Storage Optimization
- Create Partitioned Tables: Divides large tables into smaller, more manageable pieces.
- Use Data Archiving: Moves infrequently accessed data to cheaper storage.
- Implement Automated Storage Management (ASM): Manages storage resources efficiently.
Deploy Space Management – Create Partitioned Tables
Partitioning a table can significantly improve performance and manageability.
CREATE TABLE sales (
sale_id NUMBER,
sale_date DATE,
amount NUMBER
)
PARTITION BY RANGE (sale_date) (
PARTITION p1 VALUES LESS THAN (TO_DATE('2021-01-01', 'YYYY-MM-DD')),
PARTITION p2 VALUES LESS THAN (TO_DATE('2022-01-01', 'YYYY-MM-DD'))
);
Perform Data Archiving
Data archiving involves moving old data to an archive to free up space in the primary database.
CREATE TABLE sales_archive AS
SELECT * FROM sales WHERE sale_date < TO_DATE('2021-01-01', 'YYYY-MM-DD');
DELETE FROM sales WHERE sale_date < TO_DATE('2021-01-01', 'YYYY-MM-DD');
Implement Automated Storage Management (ASM)
ASM simplifies the storage and retrieval of data, improving overall efficiency.
ALTER SYSTEM SET asm_preferred_read_failure_groups = 'DGROUP1', 'DGROUP2';
Conclusion
Deploying space management and storage optimization features in Oracle 19c is crucial for maintaining an efficient and cost-effective database environment. By utilizing techniques such as segment shrinking, compression, deduplication, partitioning, data archiving, and ASM, database administrators can ensure optimal performance and resource utilization.
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