Menu
I am creating a new DB and was wondering if there was any downside to adding numerous indexes to tables that I think may require one.
If I create an index but end up not utilizing it will it cause any issues?
417
Yes you can have too many indexes as they do take extra time to insert and update and delete records, but no more than one is not dangerous, it is a requirement to have a system that performs well.
Too many indexes create additional overhead associated with the extra amount of data pages that the Query Optimizer needs to go through. Also, too many indexes require too much space and add to the time it takes to accomplish maintenance tasks.
To start, I'd say that most tables should have fewer than 15 indexes. In many cases, tables that focus on transaction processing (OLTP) might be in the single digits, whereas tables that are used more for decision support might be well into double digits.
Indexes make it faster to search tables, but longer to write to. Having unused indexes will end come causing some unnecessary slow down.
148
Each Index :
Which means you should only define indexes that are useful for your application's needs : too many indexes will slow down the writes more than you'll gain from the reads.
17
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
