检查表和索引的fillfactor设置

时间:2014-04-23 11:51:47

标签: postgresql fillfactor

可能有一些函数来检查索引和表的fillfactor?我已经尝试过\ d +但只有基本定义,没有fillfactor值:

        Index "public.tab1_pkey"
 Column |  Type  | Definition | Storage 
--------+--------+------------+---------
 id     | bigint | id         | plain
primary key, btree, for table "public.tab1"

桌子上找不到任何东西。如果使用fillfactor创建表而不是默认值:

CREATE TABLE distributors (
    did     integer,
    name    varchar(40),
    UNIQUE(name) WITH (fillfactor=70)
)
WITH (fillfactor=70);

然后\d+ distributors显示非标准的fillfactor。

                            Table "public.distributors"                                                                                                                                        
 Column |         Type          | Modifiers | Storage  | Stats target | Description                                                                                                            
--------+-----------------------+-----------+----------+--------------+-------------                                                                                                           
 did    | integer               |           | plain    |              |                                                                                                                        
 name   | character varying(40) |           | extended |              |                                                                                                                        
Indexes:                                                                                                                                                                                       
    "distributors_name_key" UNIQUE CONSTRAINT, btree (name) WITH (fillfactor=70)                                                                                                               
Has OIDs: no
Options: fillfactor=70

但也许有一种方法可以在不解析输出的情况下获得此值?

1 个答案:

答案 0 :(得分:10)

您需要查询pg_class系统表:

select t.relname as table_name, 
       t.reloptions
from pg_class t
  join pg_namespace n on n.oid = t.relnamespace
where t.relname in ('tab11_pkey', 'tab1')
  and n.nspname = 'public'

reloptions是一个数组,每个元素包含一个option=value定义。但对于具有默认选项的关系,它将为null。