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Editorial Team
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Asked: 2026-05-12T20:00:41+00:00

I have several Oracle queries that perform well when run through SQL*PLUS. However when

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I have several Oracle queries that perform well when run through SQL*PLUS. However when they are executed as a part of a PL/SQL package, they take MUCH longer.

Our DBA has watched these queries take 10 minutes through PLSQL and 10 seconds through SQL*Plus.

Does anybody have any pointers on where to look for the misconfiguration?

Client – Windows 2000
Server – Linux (Oracle Enterprise)

Thanks

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Resolution:

I wish I could have accepted everyone’s answers. Several of them were quite helpful.

  • The query was converting data types.
  • The execution plans didn’t match.
    (Hints fixed that.)
  • The DBA was looking at the time the cursor was
    open instead of the query time.
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1 Answer

  1. Editorial Team

    Use SQL trace to see what the execution plans are in each case. One possibility that springs to mind (from experience): is the package binding the wrong type of values to the query? It could be that in SQL Plus you are running:

    select * from mytable where id = '1234';

    but in PL/SQL you are running:

    select * from mytable where id = p_id;

    with p_id being defined as a number. That will force a TO_NUMBER on the ID column and prevent Oracle using the index.

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