request will slow down when an additional filter is given in the list IN

The following query works with 1 + seconds:
SELECT t.Owner, t.Table_Name, c.Comments, f.Column_Name, Fc.Comments
FROM All_Tables t,
     All_Tab_Comments c,
     All_Tab_Columns f,
     All_Col_Comments Fc
WHERE c.Table_Name = t.Table_Name
      AND f.Owner = t.Owner
      AND f.Table_Name = c.Table_Name
      AND Fc.Owner = f.Owner
      AND Fc.Table_Name = f.Table_Name
      AND Fc.Column_Name = f.Column_Name
      AND t.Owner IN ('CASINO')
      AND t.Table_Name IN ('PHYSICALTABLEGROUPS')
ORDER BY t.Owner, t.Table_Name, f.Column_Name;
Query below seems to work at least + 30 seconds, I don't know how long it works:
SELECT t.Owner, t.Table_Name, c.Comments, f.Column_Name, Fc.Comments
FROM All_Tables t,
     All_Tab_Comments c,
     All_Tab_Columns f,
     All_Col_Comments Fc
WHERE c.Table_Name = t.Table_Name
      AND f.Owner = t.Owner
      AND f.Table_Name = c.Table_Name
      AND Fc.Owner = f.Owner
      AND Fc.Table_Name = f.Table_Name
      AND Fc.Column_Name = f.Column_Name
      AND t.Owner IN ('CASINO')
      AND t.Table_Name IN ('ADMINS', 'PHYSICALTABLEGROUPS')
ORDER BY t.Owner, t.Table_Name, f.Column_Name;
As you can see the only difference is with 'IN' operator. Adding more item in the request list will slow down. Why is it slow?
I have no privileges to run explain plan for this query, because I do not have certain privileges, I think for these system objects.
Can you explain why the request will slow down with the addition of a table over in the list.

I found the / * + ALL_ROWS * / tip to be useful on SQL join views great dictionary, including DBA_TAB_PARTITIONS and DBA_TAB_COLUMNS, that can develop enough long.

Tags: Database

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