select * from ALL_TAB_PARTITIONS --显示当前用户所有分区表的详细分区信息: select * from USER_TAB_PARTITIONS 根据性别分区,性别分为‘男’,‘女’,‘default’,default代表其他 可以增加一个default分区,来存储列表以外的数据。 若插入的列值不在指定的list分区范围内就会报错,为避免这种情况,使用list分区时可...
Choosing the target number of partitions that the table should be divided into is also a critical decision to make. Not having enough partitions may mean that indexes remain too large and that data locality remains poor which could result in low cache hit ratios. However, dividing the table in...
查看分区数据user_part_tables(分区数量及类型): 查看表分区规则user_tab_partitions 有二级分区,查询二级分区 range+list 通过组合range和list的方式对数据先进行范围分区,然后列表分区 create table T2 ( id number, p_month number, username varchar2(50), inputdata date, constraint T2_id primary key (id)...
postgres=# create tabletpart_list(a text primary key,b int,c int)partition bylist(a)configuration(valuesin('a'),('b'),('c'),('d')defaultpartition tpart_list_default);CREATETABLE 会自动创建5个分区:a、b、c、d和默认分区: 代码语言:javascript 复制 postgres=# \d+tpart_list Partitioned ...
默认分区,用于处理没有分区表的异常插入情况,用于存储无法匹配其他任何分区表的数据。显然,只有 RANGE 分区表和 LIST 分区表需要默认分区。 创建默认分区时,使用 DEFAULT 子句替代 FOR VALUES 子句。 CREATETABLEmeasurement_default PARTITIONOFmeasurementDEFAULT; ...
Partition key: LIST (status) Partitions: stu_active FOR VALUES IN ('ACTIVE'), stu_exp FOR VALUES IN ('EXPIRED'), stu_others DEFAULT postgres=# \d+ stu_active Table "public.stu_active" Column | Type | Collation | Nullable | Default | Storage | Stats target | Description ...
create table log_history(idint not null,logdatedatenot null,num int) partition by range(logdate); 创建分区 create table log_history_2001 partition of log_historyforvalues from ('2001-01-01') to ('2001-12-31'); create table log_history_2002 partition of log_historyforvalues from ('2002...
PostgreSQL 11 的一个重量级新特性为分区表得到较大增强,例如支持哈希分区(HASH)表,因此 PostgreSQL 支持范围分区(RANGE)、列表分区(LIST)、>哈希分区(HASH)三种分区方式,本文简单演示下哈希分区表。 Hash Partitioning The table is partitioned by specifying a modulus and a remainder for each partition. Each pa...
和分区合并(ALTER TABLE ... MERGE PARTITIONS ...)功能,以及它们的使用限制和注意事项。 我们首先创建一个用于测试的分区表: CREATE TABLE sales ( id bigint generated always as identity, area varchar(10) not null, amount numeric not null ) PARTITION BY list (area); CREATE TABLE sales_north ...
select create_range_partitions('be_user_record'::regclass,'record_time','2018-01-01 00:00:00'::timestamp,interval '1 month', null,false); 查看分区表 select * from pathman_partition_list 并行迁移数据 select partition_table_concurrently('be_user_record'::regclass,10000,1.0); ...