Shulou(Shulou.com)06/01 Report--

I. conclusion

Syntax structure: limit offset, rows

Conclusion: under the same condition of rows, the higher the value of offset, the worse the performance of limit statement.

Second, testing

Perform tests: 5750000 pieces of data

Sql 1 execution time:

Sql 6 execution time:

III. Optimization

Method 1: you can locate the data location according to other index fields such as the primary key ID, and then use limit 0, rows

For example: select * from gift_record_0 where id > = 43611207 limit 1000 0.14s

Method 2 (according to business requirements): for businesses that do not need to display all the data, such as showing only the first 2000 pieces of data, limit 0, 2000 can meet.

Summary

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