您的位置：首页 > 数据库 > Oracle

Oracle vs PostgreSQL DBA（13）- 拆分(split)分区

2019-08-03 17:05 1311 查看

直至12版本,PostgreSQL仍没有提供直接拆分分区的功能,暂时只能通过detach&attach实现,相对于Oracle的split支持,PG显得比较的simple&naive.

PG 12

```
[pg12@localhost ~]$ psql -d testdb
```
```
Timing is on.
```
```
Expanded display is used automatically.
```
```
psql (12beta1)
```
```
Type "help" for help.
```

[local]:5432 pg12@testdb=#drop table t_p1;

```
) to (200);
```

create table t_p1_maxvalue partition of t_p1 for values from (200) to (maxvalue);

```
truncate table t_p1;
```
```
insert into t_p1(id,c1) values(1,1);
```
```
insert into t_p1(id,c1) values(2,100);
```
```
insert into t_p1(id,c1) values(3,125);
```
```
insert into t_p1(id,c1) values(4,200);
```
```
insert into t_p1(id,c1) values(5,250);
```
```
insert into t_p1(id,c1) values(6,300);
```
```
insert into t_p1(id,c1) values(7,350);
```
```
insert into t_p1(id,c1) values(8,4500);
```

alter table t_p1 detach partition t_p1_maxvalue;

create table t_p1_3 partition of t_ERROR: table "t_p1" does not exist

```
Time: 8.497 ms
```

[local]:5432 pg12@testdb=#create table t_p1 (id int, c1 int) partition by range (c1);

```
p1 for values from (200) to (300);
```

insert into t_p1_3 select * from t_p1_maxvalue where c1 >= 200 and c1 < 300;

delete from t_p1_maxvalue where c1 >= 200 and c1 < 300;

alter table t_p1 attach partition t_p1_maxvalue for values from (300) to (maxvalue);CREATE TABLE

```
Time: 235.099 ms
```

[local]:5432 pg12@testdb=#create table t_p1_default partition of t_p1 default;

```
CREATE TABLE
```
```
Time: 11.941 ms
```

[local]:5432 pg12@testdb=#create table t_p1_1 partition of t_p1 for values from (1) to (100);

```
CREATE TABLE
```
```
Time: 15.247 ms
```

[local]:5432 pg12@testdb=#create table t_p1_2 partition of t_p1 for values from (100) to (200);

```
CREATE TABLE
```
```
Time: 1.705 ms
```

[local]:5432 pg12@testdb=#create table t_p1_maxvalue partition of t_p1 for values from (200) to (maxvalue);

```
CREATE TABLE
```
```
Time: 1.842 ms
```
```
[local]:5432 pg12@testdb=#
```

[local]:5432 pg12@testdb=#truncate table t_p1;

```
TRUNCATE TABLE
```
```
Time: 3.413 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(1,1);

```
INSERT 0 1
```
```
Time: 1.152 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(2,100);

```
INSERT 0 1
```
```
Time: 0.871 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(3,125);

```
INSERT 0 1
```
```
Time: 0.487 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(4,200);

```
INSERT 0 1
```
```
Time: 0.949 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(5,250);

```
INSERT 0 1
```
```
Time: 0.494 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(6,300);

```
INSERT 0 1
```
```
Time: 0.463 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(7,350);

```
INSERT 0 1
```
```
Time: 0.481 ms
```

[local]:5432 pg12@testdb=#insert into t_p1(id,c1) values(8,4500);

```
INSERT 0 1
```
```
Time: 0.464 ms
```
```
[local]:5432 pg12@testdb=#
```

[local]:5432 pg12@testdb=#alter table t_p1 detach partition t_p1_maxvalue;

```
ALTER TABLE
```
```
Time: 0.864 ms
```

[local]:5432 pg12@testdb=#create table t_p1_3 partition of t_p1 for values from (200) to (300);

```
CREATE TABLE
```
```
Time: 1.752 ms
```

[local]:5432 pg12@testdb=#insert into t_p1_3 select * from t_p1_maxvalue where c1 >= 200 and c1 < 300;

```
INSERT 0 2
```
```
Time: 7.578 ms
```

[local]:5432 pg12@testdb=#delete from t_p1_maxvalue where c1 >= 200 and c1 < 300;

```
DELETE 2
```
```
Time: 21.992 ms
```

[local]:5432 pg12@testdb=#alter table t_p1 attach partition t_p1_maxvalue for values from (300) to (maxvalue);

```
ALTER TABLE
```
```
Time: 7.356 ms
```
```
[local]:5432 pg12@testdb=#
```

Oracle

郑州人流医院:http://yyk.39.net/zz3/zonghe/1d426.html/

TEST-orcl@DESKTOP-V430TU3>create table t_p1(id int,c1 int)

```
2 partition by range(c1)
```
```
3 (partition p1 values less than(100),
```
```
4 partition p2 values less than(200),
```

5 partition pmax values less than(maxvalue)

```
6 );
```
```
Table created.
```
```
TEST-orcl@DESKTOP-V430TU3>
```

TEST-orcl@DESKTOP-V430TU3>truncate table t_p1;

```
Table truncated.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(1,1);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(2,100);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(3,125);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(4,200);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(5,250);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(6,300);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(7,350);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>insert into t_p1(id,c1) values(8,4500);

```
1 row created.
```

TEST-orcl@DESKTOP-V430TU3>alter table t_p1 split partition pmax at(1000) into (partition p3,partition pmx);

```
Table altered.
```
```
TEST-orcl@DESKTOP-V430TU3>
```

可以参照EDB的做法,加入此兼容性.

参考资料
13.3 Partitioning Commands Compatible with Oracle Databases

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航