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SQL Tuning / SQL 性能 优化 调优

2016-12-21 15:06 399 查看
Some key concents regarding SQL optimization

predicate

selectivity (column unique ratio) / cardinality (estimated returned)

driving (outer) table

access path/method (e.g. Table Scan, Index Uique/Range Scan)

join method (e.g. Nested Loops or Sort Merge)

join order (which table first as outer table)

join Types (Inner, semi - IN or Exists, anti - Not IN/Not Exists)
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