2012/9/5 Adarsh Sharma <eddy.ada...@gmail.com> > Actually that query is not my concern : > > i have a query that is taking so much time : > Slow Log Output : > # Overall: 195 total, 16 unique, 0.00 QPS, 0.31x concurrency _____________ > # Time range: 2012-09-01 14:30:01 to 2012-09-04 14:13:46 > # Attribute total min max avg 95% stddev median > # ============ ======= ======= ======= ======= ======= ======= ======= > # Exec time 80887s 192us 2520s 415s 1732s 612s 80s > # Lock time 13ms 0 133us 68us 103us 23us 69us > # Rows sent 430.89k 0 17.58k 2.21k 12.50k 3.96k 49.17 > # Rows examine 32.30M 0 466.46k 169.63k 440.37k 186.02k 117.95k > # Query size 65.45k 6 577 343.70 563.87 171.06 246.02 > > In the logs output : > # Query_time: 488.031783 Lock_time: 0.000041 Rows_sent: 50 > Rows_examined: 471150 > SET timestamp=1346655789; > SELECT t0.id, t0.app_name, t0.status, t0.run, t0.user_name, > t0.group_name, t0.created_time, t0.start_time, t0.last_modified_time, > t0.end_time, t0.external_id FROM WF_1 t0 WHERE t0.bean_type = 'Workflow' > ORDER BY t0.created_time DESC LIMIT 0, 50; > > The table is near about 30 GB and growing day by day. >
Just out curiosity, is that table too fragmented? 471k rows are quite a lot, but 488 of query time is insane. Seems you're reading from disk too much! > > Attaching the table definition & indexes output. I have a index on bean > type column but cann't understand why it > examined the all rows of table. > Where's the table's schema so we can give it a try? Manu
