In our enviroment, we choose the second. After cached the table, oracle will be very smart to know that it should read the table from memory instead of read from disk.
http://dbakevin.blogspot.ro/2012/02/serious-performance-issue-caused-by-11g.html
Get Oracle Partition High Values as VARCHAR2 types instead of LONG in
Oracle 19c and earlier
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Here’s a little PL/SQL function create_partition_high_value_func.sql that
allows you to write SQL queries against data dictionary for partition
maintenan...
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