Query executing faster after restart

Hi,
I have a query which used to take around 60 seconds to execute. The query is mainly made up of joins and has an order by condition. The query was showing a service time of 125ms when accessing the temp datafile.
When I restarted the server (windows) and database and I ran the query the execution time was 1 sec!! The query no longer seems to be accessing the temp file.
Any suggestions on what could have triggered this change?
Thanks
Keith

Because when you restart, the segments of the temp datafiles are deallocated. This means that you have space to do sort on disk if the sort of the query not have the sufficient space on SORT_AREA_SIZE
< src = http://www.csee.umbc.edu/help/oracle8/server.815/a67775/ch24_pex.htm#43319 >
SORT_AREA_SIZE
The recommended values for this parameter fall in the range from 256KB to 4MB.
This parameter specifies the amount of memory to allocate per query server process for sort operations. If you have a lot of system memory, you can benefit from setting SORT_AREA_SIZE to a large value. This can dramatically increase the performance of sort operations because the entire process is more likely to be performed in memory. However, if memory is a concern for your system, you may want to limit the amount of memory allocated for sort and hash operations.
If the sort area is too small, an excessive amount of I/O is required to merge a large number of sort runs. If the sort area size is smaller than the amount of data to sort, then the sort will move to disk, creating sort runs. These must then be merged again using the sort area. If the sort area size is very small, there will be many runs to merge and multiple passes may be necessary. The amount of I/O increases as SORT_AREA_SIZE decreases.
If the sort area is too large, the operating system paging rate will be excessive. The cumulative sort area adds up quickly because each query server process can allocate this amount of memory for each sort. For such situations, monitor the operating system paging rate to see if too much memory is being requested.
< >

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AME                                                                                   TYPE VALUE
result_cache_mode                                                                         2 MANUAL
result_cache_max_size                                                                     6 20971520
result_cache_max_result                                                                   3 5
result_cache_remote_expiration                                                            3 0
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>
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RECYCLE buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 2K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 4K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 8K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 16K buffer cache 0 0 0 0 0 STATIC 16777216
DEFAULT 32K buffer cache 0 0 0 0 0 STATIC 16777216
ASM Buffer Cache 0 0 0 16777216 0 STATIC 16777216
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AQA0FI==========S2============
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Select Single ANLA                                  13,721 11,754,305 = 11,754,305      10.3    10.3 AQA0FI==========S2============   DB     OpenS
Select Single ANLZ                                   3,753   3,259,308 = 3,259,308       2.9     2.9 AQA0FI==========S2============   DB     OpenS
Select Single ANLB                                   3,753   3,069,119 = 3,069,119       2.7     2.7 AQA0FI==========S2============   DB     OpenS
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Call Func. RSAQ_SUBMIT_QUERY_REPORT     1     358,569,656          88
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Worker 6 Status:
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