Concurrent sessions accessing parsed sql from the library cache

Hi there,
I am having five concurrent session firing exactly same SQL statement inside a stored procedure.
Stored Procedure
PROC1(a int)
begin
select <C1>,<C2> into <V1>,<V2> from <T1>, <T2> where <JOIN between both table> and T1.<C3>=a;
end;
All those five sessions are calling the procedure PROC1 which subsequently executes the sql statement.
Execution time of sql statement is 2 seconds.
I ma wondering whether all other sessions will wait for the currently executing session to release the latch on parsed sql(getting stored in the library cache)? (In this case last session will wait for 8 seconds) Or would they execute in parallel with their own copy of parsed sql?
Please help!!!
TIA,
Nishant

Would it be like that the first session will hard parse the SQL statement and all other concurrent sessions will have a "softer" soft parse and take a copy of query plan and execute the statement without waiting for each otherYes, I think this is the way it works according to official Oracle documentation
(and why there is a shared pool).:
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14220/sqlplsql.htm#i2196
But I don't know if you can find detailed documentation about all latching steps for hard parse and soft part steps.

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Concurrent sessions accessing parsed sql from teh library cache

Hi there,
I am having five concurrent session firing exactly same SQL statement inside a stored procedure.
Stored Procedure
PROC1(a int)
begin
select <C1>,<C2> into <V1>,<V2> from <T1>, <T2> where <JOIN between both table> and T1.<C3>=a;
end;
All those five sessions are calling the procedure PROC1 which subsequently executes the sql statement.
Execution time of sql statement is 2 seconds.
I ma wondering whether all other sessions will wait for the currently executing session to release the latch on parsed sql(getting stored in the library cache)? (In this case last session will wait for 8 seconds) Or would they execute in parallel with their own copy of parsed sql?
Please help!!!
TIA,
Nishant

Can you please elaborate a little further.
AFAIK the query plans are stored in the library cache and there will be latches on data structures. Won't it mandate serial execution? Please correct me if I am wrong.
Thanks...
Nishant

To know if parsed SQL is in library cache and parse count

hello,
i want to know if a sql that was fired has its parsed code still in library cache. How do i know? One more question. I would also like to know how many times a sql is parsed and loaded onto library cache (assuming that I have its hash value)
thank you in advance.

V$DB_OBJECT_CACHE: To view displays database objects that are cached in the library cache.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_1083.htm
V$SQLAREA lists statistics on shared SQL area and contains one row per SQL string. It provides statistics on SQL statements that are in memory, parsed, and ready for execution.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2129.htm
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Concurrent sessions accessing parsed sql from the library cache

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