How to determine "fetch size" of an application?

Question

Hi, all.
The db is 11.2.0.3 on a linux machine.
I would like to know the "fetch size" of an application, but I was not able to find any related meteris in v$statname.
The application configruation is invisible to me.
Do I need to do some calculations based on statistic metrics from v$statname?
If so, what meteris should be considered for the assumption for "fetch size" ?
The following is from manual, but the application configuration is invisible to me.
http://docs.oracle.com/cd/E11882_01/java.112/e16548/resltset.htm#i1023619
Setting the Fetch Size
The following methods are available in all Statement, PreparedStatement, CallableStatement, and ResultSet objects for setting and getting the fetch size:
•void setFetchSize(int rows) throws SQLException
•int getFetchSize() throws SQLExceptionThanks in advance.
Best Regards.

Answer 1

or;
compare rows_processed, executions and fetches from v$sql for queries from your application.
HASH_VALUE EXECUTIONS    FETCHES ROWS_PROCESSED
4157030199      39288     510744       50193247
SQL> select
  fetches/executions "fetch per exec",
  rows_processed/executions "rows per exec",
  rows_processed/(executions+fetches) "avg fetch size"
from v$sql where hash_value=4157030199;
fetch per exec rows per exec avg fetch size
            13    1277.57439     91.2553134the query assumes the app is doing it 'right', and is fetching from the first execute as well as the following fetches.
the 91.25... is not the real fetch size ofcourse, as the #rows returned will typically not be an exact multiple of the 'application fetch size', but we can guess it may be 100 in this case.
also note that you speak of an application fetch size, but the fetch size is really specified per-statement (OCIStmtExecute). some applications (or API's) do indeed use a 'one size fits all', which is still better than using no array fetching at all.