Autotrace time colum bearing no resamblance to actual tiem taken
Hi,
Using sqlplus set autotracde traceonly explain to evaluate indexing strategies before kicking off queries and finding time shown on report way lower
than what actaully taken e.g query shows time of 00:02:21 and used another 3rd party tool to generate epxlain plan - both show about 2 minutes but euqery still running.
Scanning 400 million rows of 800 million row table so wouldn't expect run in 2 mins - would exect way longer and this is the case still running.
How can we get accurate estimate of how long queries will take?
Statistics all up-to-date.
Using 11.2.0.3
Thanks
Edited by: user5716448 on 05-Mar-2013 03:17
Hi,
Please find below - what diff does this make?
How do we ensure these are gathered.
I'm not familar with gathering system stats - don't they get gathered automtically?
SNAME PNAME PVAL1
PVAL2
SYSSTATS_INFO STATUS
COMPLETED
SYSSTATS_INFO DSTART
10-21-2011 04:48
SYSSTATS_INFO DSTOP
10-21-2011 04:48
SYSSTATS_INFO FLAGS 1
SYSSTATS_MAIN CPUSPEEDNW 697.478992
SYSSTATS_MAIN IOSEEKTIM 10
SYSSTATS_MAIN IOTFRSPEED 4096
SYSSTATS_MAIN SREADTIM
SYSSTATS_MAIN MREADTIM
SYSSTATS_MAIN CPUSPEED
SYSSTATS_MAIN MBRC
SYSSTATS_MAIN MAXTHR
SYSSTATS_MAIN SLAVETHR
~Thanks
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