27.01.12 11:06, Marti Raudsepp написав(ла):
> On Fri, Jan 27, 2012 at 06:31, sridhar bamandlapally
> <sridhar.bn1@gmail.com> wrote:
>> --------------------------------------------------------------------------
>> | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
>> --------------------------------------------------------------------------
>> | 0 | SELECT STATEMENT | | 7444K| 944M| 16077 (4)| 00:03:13 |
>> | 1 | TABLE ACCESS FULL| EMP | 7444K| 944M| 16077 (4)| 00:03:13 |
>> --------------------------------------------------------------------------
> Sorry to take this off topic, but... Seriously, over 3 minutes to read
> 944 MB of data? That's less than 5 MB/s, what's wrong with your
> database? :)
Actually I'd ask how parallel CPU may help table sequence scan? Usually
sequence scan does not take large amount of cpu time, so I see no point
in parallelism.