Thread: Partitioning

I have partitioned a table based on period (e.g., cdate >= '2007-01-01'::date and cdate<=.2007-03-31':;date).

Now, I am issuing query like cdate >= CURRENT_DATE - 1 and cdate <= CURRENT_DATE, it scans all the partitions. But if I do cdate >= '2007-01-01'::date and cdate<=.2007-03-31'::date it picks the correct partition. Also if I join the cdate field with another table, it does not pick the correct partition.

I would like to know if it is possible to pick the correct partition using the above example.

Thanks
Abu

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Abu Mushayeed wrote:
> I have partitioned a table based on period (e.g., cdate >=
> '2007-01-01'::date and cdate<=.2007-03-31':;date).
>
> Now, I am issuing query like cdate >= CURRENT_DATE - 1 and cdate <=
> CURRENT_DATE, it scans all the partitions. But if I do cdate >=
> '2007-01-01'::date and cdate<=.2007-03-31'::date it picks the correct
> partition. Also if I join the cdate field with another table, it does
> not pick the correct partition.
>
> I would like to know if it is possible to pick the correct partition
> using the above example.

from http://www.postgresql.org/docs/8.1/interactive/ddl-partitioning.html

..."For the same reason, "stable" functions such as CURRENT_DATE must be
avoided. Joining the partition key to a column of another table will not be
optimized, either."...


Rigmor

>
> Thanks
> Abu
>
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--
Rigmor Ukuhe
Finestmedia Ltd | Software Development Team Manager
gsm : (+372)56467729 | tel : (+372)6558043 | e-mail : rigmor.ukuhe@finestmedia.ee