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hammer and wrench Stop a high-CPU Oracle process

When an Oracle background process pins the CPU: detect it, kill the session and prevent it from returning.

HOW-TO OPERATIONS UPDATED: JUL 2026 APPLIES TO NUCLOS 4.2026.X

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These steps come from maintaining the old development VM and are very Oracle-specific. Use with care on production systems.

1. Show active processes

SELECT s.username, s.sid, s.osuser, t.sql_id, sql_text
FROM v$sqltext_with_newlines t, v$session s
WHERE t.address = s.sql_address AND t.hash_value = s.sql_hash_value
  AND s.status = 'ACTIVE' AND s.username <> 'SYSTEM';

2. Get session data

SELECT inst_id, sid, serial# FROM gv$session WHERE sid = 133;

3. Kill the session

ALTER SYSTEM KILL SESSION '133,9,@1';

To prevent recurrence, remove the root cause (e.g. a problematic materialized view).

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