insert into tbsales values(tbSales_seq.Nextval,1,5,4,16500,to_date('2010-4-14','yyyy-mm-dd')); insert into tbsales values(tbSales_seq.Nextval,2,3,3,31000,to_date('2010-4-11','yyyy-mm-dd')); insert into tbsales values(tbSales_seq.Nextval,2,6,4,40000,to_date('2010-4-13...
postgres=#createsequence seq_tb2 incrementby1minvalue100000001maxvalue200000000startwith100000001no cycle ;CREATESEQUENCE postgres=#createsequence seq_tb3 incrementby1minvalue200000001maxvalue300000000startwith200000001no cycle ;CREATESEQUENCE postgres=#createtabletb1(idintprimarykeydefaultnextval('seq_tb1')che...
ALTER SCHEMA name RENAME TO new_name ALTER SCHEMA name OWNER TO new_ownerALTER SEQUENCE修改一个序列生成器的定义。ALTER SEQUENCE name [ INCREMENT [ BY ] increment ] [ MINVALUE minvalue | NO MINVALUE ] [ MAXVALUE maxvalue | NO MAXVALUE ] [ RESTART [ WITH ] start ] [ CACHE cache ] ...
默认单个大小是16M,源码安装的时候可以更改其大小(./configure --with-wal-segsize=target_value 参数,即可设置)这些日志会在定时回滚恢复(PITR), 流复制(Replication Stream)以及归档时能被用到,这些日志是非常重要的,记录着数据库发生的各种事务信息,不得随意删除或者移动这类日志文件,不然你的数据库会有无法恢复...
使用sequence # 创建CREATESEQUENCE temp_seq; # 获取下一个sequenceselectnextval('temp_seq'); #1# 设置 sequence 的开始值selectsetval('temp_seq',42); # 获取下一个sequenceselectnextval('temp_seq'); #43# 创建一个自动循环的 sequenceCREATESEQUENCE temp_seq2 MINVALUE18MAXVALUE20CYCLE;selectnextval(...
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。
OWNER TO { new_owner | CURRENT_ROLE | CURRENT_USER | SESSION_USER } REPLICA IDENTITY { DEFAULT | USING INDEX index_name | FULL | NOTHING } and partition_bound_spec is: IN ( partition_bound_expr [, ...] ) | FROM ( { partition_bound_expr | MINVALUE | MAXVALUE } [, ...] ) ...
ALTERSCHEMAnameRENAMETOnew_nameALTERSCHEMAnameOWNERTOnew_owner 1. ALTER SEQUENCE 更改序列发生器的定义. 复制 ALTERSEQUENCEname[ INCREMENT [BY] increment ][ MINVALUE minvalue |NOMINVALUE ] [ MAXVALUE maxvalue |NOMAXVALUE ][ RESTART [WITH] start ] [ CACHE cache ] [ [NO] CYCLE ] ...
[ OPTIONS ( _option_ '_value_' [, ... ] ) ] CREATE SEQUENCE 定义一个新序列发生器。 CREATE [ TEMPORARY | TEMP ] SEQUENCE name [ INCREMENT [ BY ] increment ] [ MINVALUE minvalue | NO MINVALUE ] [ MAXVALUE maxvalue | NO MAXVALUE ] [ START [ WITH ] start ] [ CACHE cache ]...
Description:changethedefinitionofatablespaceSyntax:ALTERTABLESPACEnameRENAMETOnew_nameALTERTABLESPACEnameOWNERTO{new_owner|CURRENT_ROLE|CURRENT_USER|SESSION_USER}ALTERTABLESPACEnameSET(tablespace_option=value[,...])ALTERTABLESPACEnameRESET(tablespace_option[,...])postgres=#altertablespacetest_tbsrenametoprod_...