<sabin.coanda@deuromedia.ro> wrote:
> Hi there,
>
> I am still concerned about this problem, because there is a big differences
> between the two cases, and I don't know how to identify the problem. Can
> anybody help me, please ?
Sure, first step, if you can provide the following:
pg version
os and version
output of explain analyze of each query (one good query, one bad)
In the meantime, make sure you've vacuum analyzed your db.
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