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The question was, if you have an index on some fields in your table, if after a lot of inserts (or updates) the performance is affected and if there is some way to speed it up again?
I am not sure, but I have read so many articles about boosting performance that I got confused a little bit. Does fragmentation, e.g. apply to this issue? Or sth else? Or do many inserts on a table with a few indexes not influence the performance at all?
Your are probably looking for
OPTIMIZE table;.See here in the mysql documentation.