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Taming the Tablespace Monster: Oracle Database Space Management Essentials

Ever feel like your Oracle database is slowly being devoured by a monstrous tablespace? Uncontrolled data growth can lead to performance issues and storage headaches.

Worry not, brave DBAs! Today we'll conquer the tablespace monster with essential space management techniques:


  • Know Your Enemy: Identify your space hogs! Use powerful views like DBA_SEGMENTS and DBA_TABLESPACES to pinpoint tablespaces with high space usage. These views provide detailed information on segment types, space allocation, and usage statistics.

  • Declutter and Organize: Employ techniques like partitioning, dropping unused indexes, and archiving old data to free up valuable space.

  • Automate the Cleanup: Schedule regular jobs for tasks like data archiving and segment coalescing to keep your tablespaces tidy.

  • Monitor and Proact: Set up space usage alerts to stay ahead of potential issues. Early detection is key to preventing storage meltdowns!


Identifying Space Hogs:


  • DBA_SEGMENTS Query:

 

set lines 200 pages 2000

col segment_name for a40

SELECT tablespace_name, segment_type, segment_name, SUM(bytes)/1024/1024/1024 AS segment_size_gb FROM dba_segments GROUP BY tablespace_name, segment_type, segment_name ORDER BY segment_size_gb DESC;


  • Monitoring Free Space:

SELECT tablespace_name, sum(bytes/1024/1024/1024) AS free_gb FROM dba_free_space group by tablespace_name;



Bonus Tip: Consider implementing Automatic Storage Management (ASM) for simplified disk management and improved space utilization.

Tame the tablespace monster and reclaim control of your database! Share your favorite space management strategies or any recent battles with uncontrolled data growth in the comments below.



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