While trying to improve the performance of few queries, we found via execution plan that there were lot of index / clustered index seeks.
First thing we did, was to check our Re-indexing and update stats job which runs weekly for this user DB ( Around 400 GB in size and is used 24*5). The job was running fine.
Later when we ran
SP_Blitz, we came to know that auto-update-stats is disabled for this user DB. We expected this to be a possible cause and change it from false to TRUE (Auto update stats)
SP_blitz there are user-created statistics for this DB. When ran the query to check how many, we saw around 7K user stats out there.
So my questions would be
setting the Auto update stats to TRUE would require a reboot or once changed I need to track the performance
Should we consider dropping those user created stats or manually look into them one by one?
How should we proceed on this, please suggest, thanks!