flexible analysis questions

Please help me if you know the answers:
A. the AddToStatementCache command will reduce the soft parse?
(B) is it true that you use a ref (as output parameter) cursor inside a package it will always lead to a soft analysis?
C. how he gets the AddToStatementCache with the connection pool?
TIA
Amiel Davis

Hello

AddToStmtCache is necessary only if you try to manually control wich statements are cached rather than leaving control of the ODP it (via an LRU basis). For this, false for the instructions, don't want not added to the cache, and true to the statements you made.

ODP uses the declaration of caching to keep cursors on the database open, which eliminates the need for analysis. If the connection you are using is not manage a specific statement in its cache, it would need to create a new statement handle for the statement, which will lead to a re - analysis.

If you want to eliminate the new analysis in soft sight, you would set the size of cache big enough statement that it can contain every statement that you are running, which would likely impact of large memory capacity on the use of memory of your application, depending on the number of unique statements you run and how the connection pool is great.

However, ODP also maintains the cache on a per-connection basis. Say so you have 6 connections in a pool and then the pool grows, new connections are not cached, so even "previously cached" statements should still be analyzed again. Or, if there is a statement that is cached on other connections, but has not been performed on this particular connection yet, it will be parsed once again.

Regarding your question "pooling and caching of instruction, the docs cover this (scroll to the bottom): http://download.oracle.com/docs/html/B14164_01/featOraCommand.htm#CIHCAFIG

With respect to the determination of an optimal value for the size of the cache, I would probably recommend just using the 'auto tuning' function available from 11.1.0.7.20: http://www.oracle.com/technetwork/topics/dotnet/whatsnew/odp-2-133261.pdf

You can never completely eliminate the soft parsed however, even if you are not using ref Cursor.

It will be useful, corrections and comments welcome.

Greg

Tags: Database

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