Use of sort_area_size and sort_area_retained_size

Hi,
can u please say me what is the use of sort_area_size and sort_area_retained_size
and where to apply this parameter and will theses parameters will help in executing queries faster?
Thanks
regards
Sathish

Hello Sathish,
sort_area_size specifies the maximum amount of "memory" oracle will use for a sort. after the sort is complete oracle releases all of the memory allocated for the sort
If you have large sorts, and the memory allocated for sorts is low, then temporary tablespace would be used for sorting and therefore result in io, which means performance degradation. You might require more sort areas for inserts and updates of bitmap indexes
sort_area_retained_size specifies the amount of memory that would be retained after a sort run completes. This memory is not releases to the operating system
Where to apply these parameters... look at the statspack report and see the sorts on the disk... use of the temporary ts. If I/O for disk-sort is high, you would get benefit of using larger sort-area
yes it would help your queries to run faster... if disk-sorts are taking place
Regards
Sudhanshu

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It's a little hard to read your post. If you use any HTML tags then all bbcode tags are ignored - perhaps you included some HTML tags when you posted?
Anyway, the AREASIZE settings depend on your Oracle version. From 9i onwards they are not used if workarea_size_policy is set to AUTO, in which case a percentage of pga_aggregate_target is used instead.

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Could someone explain the purpose of altering the SORT_AREA_SIZE and HASH_AREA_SIZE database parameters?
I had come across the following lines of code in one of my new application's package.
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NAME                                                                  VALUE
bytes processed                                                  1.1742E+10
aggregate PGA target parameter                                    25165824
maximum PGA allocated                                              20128768
total PGA allocated                                                17669120
aggregate PGA auto target                                          12653568
total PGA inuse                                                    11108352
global memory bound                                                 1257472
maximum PGA used for auto workareas                                  688128
cache hit percentage                                                    100
total freeable PGA memory                                                 0
PGA memory freed back to OS                                               0
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maximum PGA used for manual workareas                                     0
over allocation count                                                     0
extra bytes read/written                                                  0
total PGA used for manual workareas                                       0
total PGA used for auto workareas                                         0
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