尝试刷新实体化视图时出错55000`object_not_in_prerequisite_state`

Question

我试图运行REFRESH MATERIALIZED VIEW CONCURRENTLY recipe_search;，但PostgreSQL给了我这个错误：ERROR 55000 (object_not_in_prerequisite_state): cannot refresh materialized view "public.recipe_search" concurrently。

有问题的物化视图在psql中显示如下：

# \d recipe_search

   Materialized view "public.recipe_search"
  Column  |          Type          | Modifiers
----------+------------------------+-----------
 id       | integer                |
 title    | character varying(255) |
 document | tsvector               |
Indexes:
    "recipe_search_document_index" gin (document)
    "recipe_search_title_trgm_index" gin (title gin_trgm_ops)

为什么我不能同时刷新它？

Answer 1

物化视图需要唯一索引

实体化视图无法刷新CONCURRENTLY，除非它至少有一个唯一索引，如文档中所述：

  

CONCURRENTLY

     

...只有在物化视图中至少有一个UNIQUE索引只允许使用列名并包含所有行时，才允许使用此选项。也就是说，它不能索引任何表达式，也不能包含WHERE子句。

     

https://www.postgresql.org/docs/9.6/static/sql-refreshmaterializedview.html