Re: Rapidly finding maximal rows

Dear Bricklen,

>Try setting work_mem to something larger, like 40MB to do that sort
>step in memory, rather than spilling to disk. The usual caveats apply
>though, like if you have many users/queries performing sorts or
>aggregations, up to that amount of work_mem may be used at each step
>potentially resulting in your system running out of memory/OOM etc.

Thanks, I'll bear that in mind as a strategy. It's good to know. But since 
Dave has saved me the sort altogether, I'll go with his plan.

Best wishes,

James
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James Cranch                 http://www.srcf.ucam.org/~jdc41