CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [ IF NOT EXISTS ] name ] ON table_name [ USING method ] ( { column_name | ( expression ) } [ COLLATE collation ] [ opclass ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, ...] ) [ WITH ( storage_parameter = value [, .....
如果没有指定,将会使用 default_tablespac。或者对临时表上的索引使用 temp_tablespaces。 predicate部分索引的约束表达式。 索引存储参数 可选的WITH子句为索引指定存储参数。每一种索引方法都有自己的存储参数集合。B-树、哈希、GiST 以及 SP-GiST 索引方法都接受这个参数: fillfactor (integer) 索引的填充因子是一个...
postgres=# \d tab Table "public.tab" Column | Type | Modifiers ---+---+--- col | integer | Indexes: "idx" btree (col) INVALID 这种情况推荐的恢复方法是删除掉索引并且再次执行CREATE INDEX CONCURRENTLY. (另一种重建索引的方法是使用REINDEX.然而,因为REINDEX不支持并发建立索引,所以这种方式可用...
CREATE INDEX gin_idx_wide_table ON wide_table USING GIN (d_1_10 ,d_2_10 ,d_3_8 ,d_4_20 ,d_5_30 ,d_6_3 ,d_7_7 ,d_8_4 ,d_9_10 ,d_11_3 ,d_12_4 ,d_13_6 ,d_14_5 ,d_15_4 ,d_16_20 ,d_17_15 ,d_18_50 ,d_19_32 ,d_20_30) WITH (fastupdate = of...
**User用户:**postgres用户是默认创建的超级管理员;每个数据库都有一个OWNER用户,每个用户可以OWNER多个数据库。 数据库对象:这里包含了table,index,view,序列,函数等,数据最终存储在表中。表的组成表由多个 page [ block]组成)一个page包含(页头信息空闲空间 Tuple),实际存储数据的区域–>对应到物理层面上就是文...
LlamaIndex is a data framework for your LLM applications - llama_index/CHANGELOG.md at feature/lindormsearch-vector-db · Rainy-GG/llama_index
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CREATE [ UNIQUE ] INDEX [ CONCURRENTLY ] [ [存在しない場合] name ] ON [ ONLY ] table_name [ USINGメソッド] ( { column_name | (式) } [ COLLATE照合順序] [ opclass [ ( opclass_parameter = value [, ...] ) ] ] ] [ ASC | DESC ] [ NULLS { FIRST | LAST } ] [, .....
postgres=> CREATE TABLE lab AS SELECT generate_series (0,100000); SELECT 100001 In the following example, we run the query with AUTOVACUUM turned on for the DB cluster. Thedead_tuple_countis 0, which indicates that the AUTOVACUUM has deleted the obsolete data or tuples from the PostgreSQL ...
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