104 lines
1.9 KiB
Markdown
104 lines
1.9 KiB
Markdown
# edb 12 创建分区表
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edb12 兼容oracle 11g
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可以使用Oracle 的自动分区。
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```sql
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CREATE TABLE ckw_test (
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id bigserial NOT NULL,
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"name" varchar(255) NULL,
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afferent_date timestamp NOT null
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)PARTITION BY RANGE (afferent_date)
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INTERVAL (NUMTOYMINTERVAL(1,'MONTH'))
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(
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partition part_202209 values less than('20221001')
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) ;
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```
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普通分区转自动分区
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```sql
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ALTER TABLE <table_name> SET INTERVAL (<constant> | <expression>);
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ALTER TABLE ckw_test SET INTERVAL (NUMTOYMINTERVAL(1,'MONTH'))
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```
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自动分区单位
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```sql
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--年-月
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NUMTOYMINTERVAL(1,'year')
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NUMTOYMINTERVAL(1,'month')
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--日-时-分-秒
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numtodsinterval(1,'day')
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```
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查询分区表信息
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```sql
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select * from dba_tab_partitions where table_name='TCN_STAT';
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SELECT * FROM ALL_TAB_PARTITIONS;
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```
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分区表操作
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```sql
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-- 分离分区表
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ALTER TABLE tcn_stat DETACH PARTITION tcn_stat_part_default;
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-- 附加分区表（数据不能与分区规则冲突）
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--附加分区 需要指定 分区条件
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ALTER TABLE tcn_stat ATTACH PARTITION tcn_stat_part_default;
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-- 默认分区
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ALTER TABLE ckw_test ATTACH PARTITION ckw_test_part_default DEFAULT;
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-- 小于2022-10-01 的数据
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ALTER TABLE ckw_test ATTACH PARTITION ckw_test_part_default values less than('20221001')
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-- 区间数据
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ALTER TABLE ckw_test ATTACH PARTITION ckw_test_part_default VALUES from ('20190101') TO ('20190201');
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-- 合并操作
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select table_name,high_value,partition_name from dba_tab_partitions where table_name='t1';
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alter table t1 merge partitions p2,p1 into partition p1_2;
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-- 拆分分区
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-- at() 括号里为分割条件 如 '20190101'
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alter table t1 split partition p1_2 at(100) into (partition p1,partition p2);
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-- 删除分区
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alter table t1 drop partition p3;
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-- 交换分区
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-- 用表test_t1 替换 t1的分区p2
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create table test_t1 (id int,name varchar2(20));
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alter table t1 exchange partition p2 with table test_t1;
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```
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