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    <p>How long does that SQL actually take? You are only going to run it once I presume, having fixed the bug that caused the corruption in the first place? I just set up a test case like this:</p> <pre><code>SQL&gt; create table my_objects as 2 select object_name, ceil(rownum/5) groupid, rpad('x',500,'x') filler 3 from all_objects; Table created. SQL&gt; select count(*) from my_objects; COUNT(*) ---------- 83782 SQL&gt; select * from my_objects where groupid in ( 2 select groupid from my_objects 3 group by groupid 4 having count(*) &lt;&gt; 5 5 ); OBJECT_NAME GROUPID FILLER ------------------------------ ---------- -------------------------------- XYZ 16757 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx YYYY 16757 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Elapsed: 00:00:01.67 </code></pre> <p>Less than 2 seconds. OK, my table has half as many rows as yours, but 160K isn't huge. I added the filler column to make the table take up some disk space. The AUTOTRACE execution plan was:</p> <pre><code>------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| ------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 389 | 112K| 14029 (2)| |* 1 | HASH JOIN | | 389 | 112K| 14029 (2)| | 2 | VIEW | VW_NSO_1 | 94424 | 1198K| 6570 (2)| |* 3 | FILTER | | | | | | 4 | HASH GROUP BY | | 1 | 1198K| 6570 (2)| | 5 | TABLE ACCESS FULL| MY_OBJECTS | 94424 | 1198K| 6504 (1)| | 6 | TABLE ACCESS FULL | MY_OBJECTS | 94424 | 25M| 6506 (1)| ------------------------------------------------------------------------- </code></pre>
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    1. USTony Andrews
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    1. COAye, thats more like what I'd expect. 90K or 160K rows in oracle terms is pretty insignificant (or at least should be)
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    2. COThat's what I would expect myself, I must admit I trying to help a colleague here, and he stopped the script after 2min. No real idea why it takes that long, my first guess was the missing index and I am not an Oracle expert, so maybe I am just missing some informations/settings.
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    3. COWhat you may have, I suppose, are stale optimiser statistics that misled Oracle into choosing a poor plan?
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