Materialized views

- 物化视图，不实时查询表，定期更新，查询速度快

视图的更新频率我们可以在这看到：select * from dba_jobs ， 一般在创建视图的时候完成的。

也可以在 sql developer的scheduler里查看：

Synonyms 

- 别名，有些时候可以用于dblink查询其他数据库的表来定义成本地表名一样

CREATE OR REPLACE PUBLIC SYNONYM "XXX" FOR "<SCHEMA>"."XXX";

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