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1.對查詢進行優化,要儘量避免全表掃描,首先應考慮在 where 及 order by 涉及的列上建立索引。
2.應儘量避免在 where 子句中對字段進行 null 值判斷,否則將導致引擎放棄使用索引而進行全表掃描,如:
select id from t where num is null
最好不要給數據庫留NULL,儘可能的使用NO
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This article has been kindly supported by our dear friends at DebugBear, who help optimize web performance to improve user experience. Thank you!
Running a performance check on your site is
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