华为云云数据库GaussDB使用Ustore进行测试_云淘科技
创建Ustore表
使用CREATE TABLE语句创建Ustore表。
gaussdb=# CREATE TABLE ustore_table(a INT PRIMARY KEY, b CHAR (20)) WITH (STORAGE_TYPE=USTORE); NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index "ustore_table_pkey" for table "ustore_table" CREATE TABLE gaussdb=# \d+ ustore_table Table "public.ustore_table" Column | Type | Modifiers | Storage | Stats target | Description --------+---------------+-----------+----------+--------------+------------- a | integer | not null | plain | | b | character(20) | | extended | | Indexes: "ustore_table_pkey" PRIMARY KEY, ubtree (a) WITH (storage_type=USTORE) TABLESPACE pg_default Has OIDs: no Options: orientation=row, storage_type=ustore, compression=no
为Ustore表创建索引
Ustore当前仅支持B-tree类型的多版本索引,在一些场景中,为了区别于Astore的B-tree索引,我们也会将Ustore表的多版本B-tree索引称为UB-tree(Ustore B-tree,UB-tree介绍详见Index章节)。用户可以参照以下方式使用CREATE INDEX语句为Ustore表的 “a” 属性创建一个UB-tree索引。
Ustore表不指定创建索引类型,默认创建的是UB-tree索引:
gaussdb=# CREATE INDEX UB-tree_index ON ustore_table(a); CREATE INDEX gaussdb=# \d+ ustore_table Table "public.ustore_table" Column | Type | Modifiers | Storage | Stats target | Description --------+---------------+-----------+----------+--------------+------------- a | integer | not null | plain | | b | character(20) | | extended | | Indexes: "ustore_table_pkey" PRIMARY KEY, ubtree (a) WITH (storage_type=USTORE) TABLESPACE pg_default "ubtree_index" ubtree (a) WITH (storage_type=USTORE) TABLESPACE pg_default Has OIDs: no Options: orientation=row, storage_type=ustore, compression=no
父主题: Ustore简介
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