PostgreSQL hstore 列性能提升案例
PostgreSQL 支持hstore 来存放KEY-gt;VALUE这类数据, 其实也类似于ARRAY或者JSON类型。 要高效的使用这类数据,当然离不开高效
PostgreSQL 支持hstore 来存放KEY->VALUE这类数据, 其实也类似于ARRAY或者JSON类型。 要高效的使用这类数据,当然离不开高效的索引。我们今天就来看看两类不同的索引对于同一种检索请求的性能问题。
假如我们有这样一个原始表,基于str1字段有一个BTREE索引。
t_girl=# \d status_check;
Table "ytt.status_check"
Column | Type | Modifiers
--------+-----------------------+-----------
is_yes | boolean | not null
str1 | character varying(20) | not null
str2 | character varying(20) | not null
Indexes:
"index_status_check_str1" btree (str1)
里面有10W条记录。 数据大概如下,
t_girl=# select * from status_check limit 2;
is_yes | str1 | str2
--------+------+----------------------
f | 0 | cfcd208495d565ef66e7
t | 1 | c4ca4238a0b923820dcc
(2 rows)
Time: 0.617 ms
t_girl=#
存放hstore类型的status_check_hstore 表结构,基于str1_str2字段有一个GIST索引。
Table "ytt.status_check_hstore"
Column | Type | Modifiers
-----------+---------+-----------
is_yes | boolean |
str1_str2 | hstore |
Indexes:
"idx_str_str2_gist" gist (str1_str2)
t_girl=# select * from status_check_hstore limit 2;
is_yes | str1_str2
--------+-----------------------------
f | "0"=>"cfcd208495d565ef66e7"
t | "1"=>"c4ca4238a0b923820dcc"
(2 rows)
Time: 39.874 ms
更多详情见请继续阅读下一页的精彩内容:
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PostgreSQL 的详细介绍:请点这里
PostgreSQL 的下载地址:请点这里

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