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Re: Performance problem in InnoDB
Posted by: Rick James
Date: December 02, 2010 12:44AM

How much RAM? (I assume at least 16GB.)

Plz do SHOW CREATE TABLE for the two DIM tables. They need indexes for
subnetDim.PIDType = 'LOCAL'
b2bDim.customer_name = 'turktel'
to have any hope of optimizing.

Which of those is more selective? Add an index to the FACT table for the _key needed to come from the DIM table.

I see no benefit in PARTITIONing for this one SELECT. I assume from
"Comment: Stores the Subnet Tracker hourly data for 1 month "
that you are using PARTITIONing to quickly purge data once a day.

group by fact.date_key , fact.time_key;
It probably does not matter here, but it is usually better to have a single DATETIME or TIMESTAMP field, not a pair of fields.

About the only use for
KEY `idx_FACT_HOUR_SUBNET_TRACKER_lookup` (`creation_time`,`subnet_key`,`time_key`,`date_key`,`b2bunit_key`)
is if you have a query with creation_time in the WHERE or ORDER BY clause.

Or is creation_time the same as date_key+time_key? If so, the GROUP BY creation_time.

What kinds of numbers need decimal(10,2) ? That's numbers up to 99,999,999.99

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