On Wed, Jun 30, 2004 at 10:56:53PM -0400, Joseph Shraibman wrote:
Seeing how small storage for a number type is compared to a text type, and seeing how they tend to be queried on a lot, shouldn't it be reasonable for the default stats number for numerics to be 100 instead of 10?
The problem is not only storage space, but also the optimizer runtime; which would have to munge the larger amount of data ... not sure if this is critical but enlarging it by default for all numeric columns may not be desirable.
I don't think the optimizer run time is that much longer in absolute terms. The only reason I suggest it is that even experienced postgres users probably don't think about this often enough
That has merit too, but I think text fields are queried on and indexed less and would take up much more room in the stats table.
Anyway ISTM a better rule would be enlarging the default stats number for columns that are part of an index, rather than using the datatype.
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