How to find the time taken for creating execution plan alone

Hi,
Is there any way to find out the division between the time taken for query parsing, creating execution plan and actual data retrieval seperately? If I enable 'set timing on' I see the elapsed time which is the total time taken for all these 3.
Some of my queries are taking long time when I run it first time and so want to know what is it taking long, is it the parsing the query or creating the execution plan? (Since my queries run faster second time, I am assuming the major part was for parsing or creating the plan but not the data retrieval).
Also, where does Oracle keep the execution plan? Is it in the BUFFER_CACHE? if so, I tried flushing the buffer_cache and restarting the DB as well, but still the query execution seems faster compared to the first time. How long does Oracle keep the execution plan in the cache and is there anyway to increase this cache size?
Thanks in advance!

user13169027 wrote:
Hi,
Is there any way to find out the division between the time taken for query parsing, creating execution plan and actual data retrieval seperately? If I enable 'set timing on' I see the elapsed time which is the total time taken for all these 3.
Some of my queries are taking long time when I run it first time and so want to know what is it taking long, is it the parsing the query or creating the execution plan? (Since my queries run faster second time, I am assuming the major part was for parsing or creating the plan but not the data retrieval).
The ideal way for finding the answer to your questions above, would be to perform a (sql) trace of your query executions. To see the difference in the trace-files, you might want to trace the first execution in one session, and the second execution in another session: so you get two different trace files, which you can then seperately tkprof, and investigate.
Also, where does Oracle keep the execution plan? Is it in the BUFFER_CACHE? if so, I tried flushing the buffer_cache and restarting the DB as well, but still the query execution seems faster compared to the first time. How long does Oracle keep the execution plan in the cache and is there anyway to increase this cache size?
Execution plans are held in the shared-pool, not the buffer-cache. As far as I know they will be kept in memory in an LRU way (least recently used), just like db-blocks are in the buffer-pool (I know this is not entirely correct, but for all practical purposes, think of it this way).

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