We have some slow queries on one of our Moodle platform.
The 'mdl_sessions' table has ~5000 rows, and each time it's updated, this leads to a slow query (we think because of the index mdl_sess_tim2_ix (timemodified)).
Why is there an index on timecreated and timemodified for this table ?
Can we remove them ?
Thank you in advance for you answer.