Is there a difference between Statement Cache and the statement handle!
Hello!
The OCI statement cache is !session! wide. When I have a sql statement that was used before, I can use this feature.
But what is the difference between this feature and my statement handle for a certain sql statement that I can store and reuse a second time?
My stored statement handle is already prepared and the placeholders are bound. The second time I only have to copy new values in the memory positions and do an execute and that's all.
Thank you in advance
Wolfgang
The underlying optimization is the same. When you re-execute a statement, you are reusing the metadata already available in the statement and the cursor already open on the server. If you know exactly the set of statements that you are going to execute repeatedly, you can maintain the cache on your own. (Yes, you save on doing the Bind/Define calls multiple times).
OCI Statement cache makes it transparent and the application does not need to keep the references/indexes to the relevant statements. Also once a cache size is set, least recently used statements get out of the cache when the cache is full and needs to accommodate more.
To optimize the bind/defines on the statements from the statement cache, you can use this feature:
http://www.filibeto.org/sun/lib/nonsun/oracle/11.2.0.1.0/E11882_01/appdev.112/e10646/oci09adv.htm#sthref1358
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