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Status Under review
Workspace Instana
Categories Agent
Created by Guest
Created on Jul 24, 2025

RELATED IDEAS

Regarding the Usage Rate of the Oracle DB Temporary Tablespace (TEMP01)

We have received your response that the following SQL is being executed when retrieving information from the CDB. However, as a result, the usage rate of the temporary tablespace has increased.

SELECT * FROM ( SELECT max(ss.inst_id) inst_id, ss.sql_text, a.sql_id, SUM, SUM, COUNT FROM dba_hist_sqlstat a, dba_hist_snapshot s, gv$sql ss WHERE s.snap_id = a.snap_id AND a.sql_id = ss.sql_id AND s.begin_interval_time > sysdate - 1 GROUP BY ss.sql_text, a.sql_id ORDER BY SUM DESC) WHERE sql_id IS NOT NULL AND ROWNUM < 20;

Because the query is performing a Cartesian join that includes the sql_text column—which contains large SQL statement strings—the required sort area becomes quite large.

Since the main objective is to identify the top 20 SQL statements with the highest CPU usage (by SUM), it would be more efficient to join only the necessary columns (excluding sql_text) at the stage of producing this join, identify the top 20 SQLs, and then join back to v$sql to retrieve the actual SQL statements. This approach should minimize the temporary space needed when performing the MERGE JOIN.

Idea priority Medium

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