SqlDeveloper Query = Fast, PL/SQL = Slow

I've got a nagging problem that is driving me crazy. Database is 11.1.0.7 and SQLDeveloper is 1.5.1 with the same behavior in 3.0.03.
Often I will develop a complex query in SQLDeveloper and get it tuned to a point where performance is great. However when I take that query and put it in a PL/SQL procedure with dynamic SQL the performance takes a nose dive. This happens when taking a query to an Apex report as well. I use bind variables in my queries in SQLDeveloper as well as Apex/PLSQL.
If I run an explain plan in SQLDeveloper it is often identical to the plan for the query in the pl/sql environment (seen through tkprof), yet the sqldeveloper query window is always faster.
The difference in speed is remarkable, my current "problem" query is runs in 71 seconds inside a PL/SQL stored procedure using dynamic sql with bind variables. If I print that query out and copy paste the query in to a SQLDeveloper sql window (worksheet?), the exact same query prompts me for the bind variable values and then runs in 0.07 seconds. Just to make sure the rows aren't caching, if I run the stored procedure version again it still takes 71+ seconds.
If I hard code values in the PL/SQL query instead of using bind variables, the stored procedure runs as fast as SQLDeveloper, 0.07 seconds.
I originally posted a similar problem over in the Apex forum and there we suspected the issue might be related to the 11g optimizer using bind variable peeking. SLOW report performance with bind variable
Ultimately, the goal is to have predictable results when taking a query from SQLDeveloper to PL/SQL.
Are there any SQLDeveloper developers out there that can confirm that "bind variable" syntax in SQL Developer is not using bind variables, but is instead rewriting the query with hard coded values in query strings?

mcallister wrote:
I've got a nagging problem that is driving me crazy. Database is 11.1.0.7 and SQLDeveloper is 1.5.1 with the same behavior in 3.0.03.
when I take that query and put it in a PL/SQL procedure with dynamic SQL the performance takes a nose diveThat's one of the reasons not to use dynamic SQL - tuning the resulting queries is very difficult.
Is the dynamic SQL necessary? If you are only using bind variables it probably is not necessary. If you are swapping WHERE clause predicates in and out through program logic then predicting performance will be very hard (or using different column or table names too)
When I must use dynamic SQL I find a useful technique is to create a debugging table with a CLOB into which I can insert the generated SQL code for later reference. That code can be used for both debugging (looking for syntax errors) and tuning. I also find it very, very useful to write the dynamic SQL with proper formatting and linefeeds so it is immediately readable on inspection
Are there any SQLDeveloper developers out there that can confirm that "bind variable" syntax in SQL Developer is not using bind variables, but is instead rewriting the query with hard coded values in query strings?You can see if query rewrites are taking place by using the NO_QUERY_TRANSFORMATION hint and seeing if the execution plan changes while tuning. To a lesser degree you can examine execution plans from V$SQL_PLAN to look for signs of changes like predicates you didn't code but this is also very hard

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SELECT banner FROM v$version;
BANNER
Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production
PL/SQL Release 11.2.0.2.0 - Production
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Hi All!
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INTO
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set echo off
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 ( rpad
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start with
month_column = date '1981-01-01'
order by
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VERSION
10.1.0.3.0
 
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20 | 0 | 0 | 0
30 | 0 | 2850 | 0
40 | 0 | 0 | 0
 
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20 | 0 | 0 | 0 | 2975 | 0 | 0
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Kalman Toth Database & OLAP Architect
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New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

SqlDeveloper Query = Fast, PL/SQL = Slow

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