I am currently trying to optimize my database size so it can be smaller. I did find a lot of info about adding indexes to improve performance of some queries but much less info on removing indexes. I am looking at the indexes created by default by Drupal for a field and I feel like I have some data that I don’t need here!
In the attached pictures I am trying to understand the usefulness of some indexes:
- In index on the revision, we are not using revisions. We are even using Field Sql NoRevision to make sure we don’t have any revision created. Do you think I could remove the indexes safely?
- deleted: is this used only for maintenance cron task cleaning deleted content? Is this an index that we could safely remove? It would alter a bit a performance of the deletion task, but we don’t use this.
- I am sure there is a very good reason, but why do we need to index twice entity_type, entity_id, delta and language? I see that one of each if unique and key name as PRIMARY, but I am having hard time understanding the difference. And if in some situation, we couldn’t drop 1 of the 2.
Thanks for helping me understanding better all of this 🙂
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