The answers are all there, but I'll spell them out for you:

• Use DBI with DBD::Oracle.
• The fastest way to read an array is with fetchall_arrayref.
• You may be able to do fast inserts/updates with bind_param_array, but it depends on whether or not DBD::Oracle has implemented special bulk insert code or not. Try it.
• Setting RowCacheSize may help with large selects.

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