Troubleshooting ORA-1652 by Identifying Temporary Segment Usage

I still get bit anxious when I receive this ORA-1652 error in production databases but its a hard nut to crack. Encountering ORA-1652 errors can be frustrating, especially when dealing with temporary segment usage. To quickly identify the root cause, use the following query to analyze temporary segment allocation:

SELECT

  sql_id,

  SUM(temp_space_allocated)/1024/1024 AS temp_space_MB

FROM

  dba_hist_active_sess_history

WHERE

  sample_time BETWEEN TIMESTAMP '2020-06-25 19:30:00' AND TIMESTAMP '2020-06-25 20:00:00'

GROUP BY

  sql_id

ORDER BY

  2 DESC;

  

To further investigate:

• Real-Time Session Monitoring: Use Oracle Enterprise Manager (EM) or query V$SESSION to identify active sessions consuming temporary space.
• Temporary Segment Usage: Query V$TEMPSEG_USAGE to analyze temporary segment allocation.
• v$tempseg_usage: Examine this view to identify temporary segment usage patterns.

Key Views to Analyze

• dba_hist_active_sess_history: Historical session data
• V$SESSION: Real-time session information
• V$TEMPSEG_USAGE: Temporary segment usage details
• v$tempseg_usage: Temporary segment usage patterns

Common Causes of ORA-1652

• Insufficient temporary tablespace
• Large sorting or joining operations
• Inefficient SQL queries
• Incorrect indexing

Best Practices

• Regularly monitor temporary segment usage
• Optimize SQL queries to reduce temporary space allocation
• Ensure sufficient temporary tablespace allocation
• Consider partitioning large tables

By using these queries and views, you'll quickly identify the causes of ORA-1652 errors and take corrective action to optimize your database performance.