Continual library cache misses in trace file for spatial queries

Hi all,
Could somebody explain to me how the SQL parse engine works for spatial queries.
My understanding is that Oracle creates a hash value for SQL that is parsed with no errors. This hash value is then stored in the library cache ready to be matched against other incoming SQL statements. This provides one of the main reasons for using parametising SQL in languages such as PL/SQL, .Net etc and improves performance on query intensive applications.
However i have noticed that for spatial, any queries except for refreshes of identical ones already sent, the SQL engines re parses the query. This can take upto 0.2 seconds which is causing a performance bottle neck.
When looking at the full trace file of a single spatial query using SDO_FILTER with a query window the amount of additional internal queries that are performed is quiet a lot. Are these additional queries included in the total parse time?
I am wondering why for spatial queries the only way to get a hit in the library cache was to refresh an exact same SQL that had been previously sent?
Thanks
Daniel

Those additional internal queries are not included in the parse time,
if they are used in the execution time.
Edited by: yhu on Mar 4, 2011 10:52 AM

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