PostgreSQL天然集群,多个集群可以组成集簇,有点类似军队的连、团、旅这样的组织规则。对于我们日常学习使用的单节点则是单个集簇单个集群,自己就是集群。 PostgreSQL如何管理这种集群规则?答案是通过一个无符号4个字节的标识进行管理,一个对象就是集群里的一个数据库。 1.2 数据库对象和对象符号标识 数据库对象和对象...
复制 [root@EULER1~]# su-pg1-c"psql -Upostgres -p 5432 -h 192.168.123.60"Passwordforuser postgres:psql(12.5)Type"help"forhelp.postgres=# create tablespace mytbs location'/opt/custome-tablespace';CREATETABLESPACEpostgres=# \db+Listoftablespaces Name|Owner|Location|Access privileges|Options|Size|...
"tbl_partition_201304_join_date_check" CHECK (join_date >= '2013-04-01'::date AND join_date Inherits: tbl_partition david=# 五、测试 5.1 插入数据 david=# insert into tbl_partition values (1, 'David', '1', '2013-01-10', 'TS'); INSERT 0 0 david=# insert into tbl_partition va...
TABLESPACE fasttablespace;ALTERTABLEmeasurement_y2008m02ADDCONSTRAINTy2008m02CHECK( logdate>=DATE'2008-02-01'ANDlogdate<DATE'2008-03-01');ALTERTABLEmeasurement ATTACHPARTITIONmeasurement_y2008m02FORVALUESFROM('2008-02-01')TO('2008-03-01'); ATTACH PARTITION 命令需要对分区表使用 SHARE UPDATE EXCLUSIVE...
List Partitioning 通过显式列出每个分区中出现的键值对表进行分区。 Hash Partitioning 通过为每个分区指定模数和余数来对表进行分区。每个分区将保存分区键的哈希值除以指定模数将产生指定余数的行。 一、声明式分区 PostgreSQL 允许您声明一个表被划分为多个分区。被划分的表称为分区表。该声明包括如上所述的分区方法...
postgres=# insert into tbl2 values (1,'test'); INSERT 0 1 postgres=# update tbl set id=2; UPDATE 1 postgres=# select * from tbl2; id | info ---+--- 2 | test (1 row) 【强制】对于频繁更新的表,建议建表时指定表的fillfactor=85,每页预留15%的空间给HOT更新使用。
() if msg is not None: return msg # check if the node is ready to be used by pg_rewind self._rewind.ensure_checkpoint_after_promote(self.wakeup) if self.is_standby_cluster(): # in case of standby cluster we don't really need to # enforce anything, since the leader is not a ...
ERROR: child table is missing constraint"pl_cl_check" //当此时再将该表加入继承时,系统报错。因为在加入继承时,系统会对该表的非空约束以及普通约束进行检查,检查其是否与父表一致,若不一致,则不可以为该表加入继承关系。 //由于上一步操作删除了 c1表的 check 约束,因此,在为c1表添加继承时,系统提示子...
Enabled Grant on schema to takes effect correctly on future objects created in that schema by any of the schema’s authorized users. Fixed an issue to pick correct collation for prepared statements. Fixed an issue to have foreign key constraint check work correctly when column is created using ...
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name PARTITION OF parent_table [ ( { column_name [ WITH OPTIONS ] [ column_constraint [ ... ] ] | table_constraint } [, ... ] ) ] { FOR VALUES partition_bound_spec | DEFAULT } ...