CREATE INDEX index_name ON table_name(column_list)WHERE condition; 在这里,index_name 是你想要创建的索引的名称,table_name 是包含你想要索引的列的表的名称,column_list 是你想要索引的列的列表,而 condition 是一个布尔表达式,用于定义哪些行将被包含在索引中。 隐式索引 在
s = 序列5、t = 表格6、v = 视图postgres=# \dt List of relations Schema | Name | Type | Owner---+---+---+--- public | example_tbl | table | postgres 4、显示角色和成员 角色用于连接到 PostgreSQL、分配数据库权限
LIST (status) Indexes: "customers_status_idx" btree (status) Partitions: cust_active FOR VALUES IN ('ACTIVE'), cust_archived FOR VALUES IN ('EXPIRED1', 'EXPIRED2'), cust_others DEFAULT postgres=# \d+ cust_archived Table "public.cust_archived" Column | Type | Collation | Nullable | De...
psql -c "CREATE TABLE tab_\$dateStr (LIKE tab INCLUDING INDEXES); ALTER TABLE tab ATTACH PARTITION tab_\$dateStr FOR VALUES IN ('\$dateStr')"; EOF (crontab -l2>/dev/null;echo"0 14 * * * bash /tmp/create_part.sh ")|crontab- 使用数据库内置调度器,如 pg_cron、pg_timetable 以p...
Table "public.t1" Column | Type | Collation | Nullable | Default ---+---+---+---+--- id | integer | | | info | text | | | Indexes: "t1_id_idx" btree (id) test=# explain select * from t1 where t1.id between 10007 and 11000; QUERY PLAN --- Index Scan using t1_id_...
PostgreSQL版本:PostgreSQL 9.2.2 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.6 20120305 (Red Hat 4.4.6-4), 64-bit 三、实现分区 3.1 创建主表 david=# create table tbl_partition ( david(# id integer, david(# name varchar(20), ...
\di[S+] [PATTERN] list indexes \dl list large objects, same as \lo_list \dL[S+] [PATTERN] list procedural languages \dn[S+] [PATTERN] list schemas \do[S] [PATTERN] list operators \dO[S+] [PATTERN] list collations \dp [PATTERN] list table, view, and sequence access privileges ...
CREATETABLElist_example(dnameVARCHAR2(10),DATAVARCHAR2(20))PARTITIONBYLIST(dname)(PARTITIONpart01VALUES('ME','PE','QC','RD'),PARTITIONpart02VALUES('SMT','SALE')); 1. 2. 3. 4. 5. 6. (3)、哈希分区表 CREATETABLEhash_example(hash_key_columnDATE,DATAVARCHAR2(20))PARTITIONBYHASH(hash...
(rlocator.relNumber));if(SMgrRelationHash==NULL){/* First time through: initialize the hash table */HASHCTLctl;ctl.keysize=sizeof(RelFileLocatorBackend);ctl.entrysize=sizeof(SMgrRelationData);SMgrRelationHash=hash_create("smgr relation table",400,&ctl,HASH_ELEM|HASH_BLOBS);dlist_init(&un...
ON table_name USING HASH (indexed_column); GiST 索引(Generalized Search Tree - 通用的搜索树) GiST 的意思是通用的搜索树(Generalized Search Tree)。内部是平衡树的访问方式,GiST索引通常可以用来替代其他索引,比如Btree。 Gist索引的创建方式如下: