how often should i be indexing?

i asked the question of whether an 开发者_开发知识库index would help me:

should i be creating an index for this?

i understand that since i am adding code every time in this procedure, i would need to re-index. in this case is it even worth it to index every time?

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You don't need to re-index. Once you create an index it mysql, the engine automatically preserves that index. It updates it whenever the content of the table changes.