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mysql features indexes

  • without index MySQL will search through all table
  • used for fast search for WHERE column or for JOIN
  • do not create indexes in advance, but for particular high load
  • create indexes if slow query log is more then 1 second
  • create indexes only for frequent queries
  • create indexes for table with more than one thousands records
  • an accelerate SELECT, and make slower UPDATE, DELETE, INSERT
  • delete useless indexes

Index type:

  • b-tree
  • hash (memory engine)

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