On Wed, Nov 23, 2011 at 6:13 PM, Platonides <[email protected]> wrote:
>> UPDATE  tmpcategories
>> SET c_category = 'A-Class_Water_supply_and_sanitation_articles',
>> c_ranking = '425', c_replacement = 'A-Class'
>> WHERE c_project = 'Water_supply_and_sanitation' and c_rating= 'A-Class'
>> and c_type = 'quality'
>
> I guess you could make the query sorter by splitting it adding a LIMIT
> clause, then rexecing while the affected rows = limit. (Assuming you
> don't need the UPDATE to be atomic)

The WHERE clause completely specifies a primary key, so at most one
row is affected.  That's why it is surprising to me that it would take
very long.

- Carl

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