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Another interesting troubleshooting case

Posted on May 29, 2021 by Sayan Malakshinov Posted in oracle, PL/SQL, PL/SQL optimization, trace, troubleshooting Leave a comment

Got an interesting question today in RuOUG:

Some very simple PL/SQL procedures usually are completed within ~50ms, but sometimes sporadically longer than a second. For example, the easiest one from these procedures:

create or replace PROCEDURE XXXX (
  P_ORG_NUM IN number,
  p_result OUT varchar2, 
  p_seq OUT number 
) AS 
BEGIN
  p_seq := P_ORG_NUM; p_result:='';
END;

sql_trace shows that it was executed for 1.001sec and all the time was “ON CPU”:

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dtrace nanosleep native compilation pl/sql troubleshooting truss
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