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Lets say I have a table with 100M rows. All table have enough space on buffer pool. So is there any performance or others benefit to create partition on that table?

NB: Storage engine - InnoDB

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If your purge strategy includes time-specific purge eligiblity, partitions could be helpful. For example, if every quarter, you will purge everything over 5 years old, it will be in your best interest to have a quarterly data table plan in place. Taking a table out of service is quicker/cleaner than DELeting a quarter's worth of data rows. innodb_file_per_table=ON will be needed to be effective. Filenames need to represent the datacontent, such as 2018Q1, 2018Q2 etc or possibly 2018W01 - W53 if you want calendar weeks to be able to purge. Dream big, plan carefully.

For alternative to simple filenaming strategy as above,

Read more on: http://mysql.rjweb.org/doc.php/partitionmaint

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