We are using software to monitor our SQL performance and one red flag that showed up immediately was the percent of fragmentation some of our indexes had. I'm not a DBA, but I dug into this to try and educate myself more on what this means. From what I understand, high fragmentation will cause performance issues, but the performance issues are usually only noticed if the indexes with high fragmentation are large.
I'm not sure what is considered "large". Some of the index sizes with high fragmentation are around 2-5 MB. Some are around 40-50 MB. I found a general calculation that one page is 8 KB, so I think that means that 2 MB equals ~250 pages (2000KB / 8KB = 250). I also read online that we shouldn't be worried about fragmentation levels if the index is less than 1000 pages.
My question is, should I be concerned about the high...