Partitioning

[James Sewell <james.sewell@xxxxxxxxxxxx>]

Hello,

I am using partitioning with around 100 sub-tables. Each sub-table is around 11GB and partitioned on the 'id' column. I have an index on the id column on each sub-table.

Is it possible to get a query like the following working using constraint exclusion, or am I doomed to do index/sequential scans of every sub-table?

I want to select all rows which have an id which is in another query, so something like:

  WITH idlist as (SELECT id from othertable) 

    SELECT id from mastertable WHERE id = idlist.id);

I am guessing that I am not getting constraint exclusion to work as the planner doesn't know the outcome of my subquery at plan time?

Any tricks I am overlooking?

James Sewell,
PostgreSQL Team Lead / Solutions Architect
______________________________________
 

Level 2, 50 Queen St, Melbourne VIC 3000

P (+61) 3 8370 8000  W www.lisasoft.com  F (+61) 3 8370 8099

 

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