On Sat, Feb 26, 2011 at 11:52 PM, John R Pierce
<pierce@hogranch.com> wrote:
On 02/26/11 10:01 AM, Alban Hertroys wrote:
On 26 Feb 2011, at 18:04, Amitabh Kant wrote:
Now if I partition the table T2 based on field T1id, making sure that each distinct T1id is provided its own child table
Table T2C1 (inherited from T2, T1id field only contains 1 for all rows)
Table T2C2 (inherited from T2, T1id field only contains 2 for all rows)
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What I would like to know here is that do I need to add an index for T1id field for either T2 or it's inherited tables (T2C1/T2C2 etc)?
No. Either would be rather pointless. In the child tables all the values in that index would have the same exact value, which you don't need as constraint exclusion already pointed the planner to the right table. In the parent table there wouldn't be any data to index.
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Not sure I am getting you correctly, but every table will have multiple rows of data, but for every row in a given table, the value of the FK would be the same.
Amitabh
