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Pre-fetch parameters allow an application to automatically fetch rows from the Oracle database when opening a cursor.
In version 1.3x, the default pre-fetch parameters are 50 rows and 65535 bytes for the pre-fetch buffer. Some customers experienced a huge memory usage with those default values, when using a lot of cursors: It appears that the Oracle client is allocating a buffer of pre-fetch.memory (i.e. 64 Kbytes) for each cursor.
In version 2.0x, the default is 10 rows and 0 (zero) bytes for the pre-fetch buffer (memory), meaning that memory is not included in computing the number of rows to pre-fetch.