关于sqlldr bindsize
Bind Arrays and Conventional Path Loads
SQL*Loader uses the SQL array-interface option to transfer data to the database. Multiple rows are read at one time and stored in the bind array. When SQL*Loader sends the Oracle database an INSERT command, the entire array is inserted at one time. After the rows in the bind array are inserted, a COMMIT statement is issued.
The determination of bind array size pertains to SQL*Loader's conventional path option. It does not apply to the direct path load method because a direct path load uses the direct path API, rather than Oracle's SQL interface.
参考：http://docs.oracle.com/cd/B28359_01/server.111/b28319/ldr_control_file.htm#i1005907
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