CREATE GLOBAL TEMPORARY TABLE t1( SYS_SESSION_ID INT, SYS_SESS_CREATE_TIME INT, c1 INT, c2 INT, PRIMARY KEY(SYS_SESSION_ID, c1) ) PARTITION BY HASH(SYS_SESSION_ID) PARTITIONS 16; 临时表 DML/查询语句 执行INSERT 时,会默认将当前会话的 Session ID 和 Session 创建时间插入 SYS_SESSION_ID...
If a row is inserted in the above table then oracle maps the value of city column and whichever partition list matches the city column the row is stored in that partition. COMPOSITE PARTITONING Composite partitioning partitions data using the range method, and within each partition, subpartitions...
obclient>CREATETABLEtbl4(col1INTPRIMARYKEY,col2INT)PARTITIONBYHASH(col1)PARTITIONS8;Query OK,0rowsaffected 创建一级分区为 Range 分区,二级分区为 Hash 分区的表。 obclient>CREATETABLEtbl5(col1INT,col2INT,col3INT)PARTITIONBYRANGE(col1)SUBPARTITIONBYHASH(col2)SUBPARTITIONS5(PARTITIONp0VALUESLESS TH...
In locally managed tablespaces, Oracle uses the value of INITIAL, in conjunction with the type of local management—AUTOALLOCATE or UNIFORM—and the values of MINEXTENTS, NEXT and PCTINCREASE, to determine the initial size of the segment. (1). With AUTOALLOCATE extent management, Oracle uses the...
支持PARTITIONS hash_partition_quantity子句定义 hash 分区数量。 不支持STORE IN (tablespace [, tablespace ]...)指定空间,忽略该 option。 不支持OVERFLOW STORE IN (tablespace [, tablespace ]...)指定空间,忽略该 option。 不支持table_compression、index_compression指定是否压缩数据段和索引压缩,忽略该 option...
Oracle很久前的版本就支持降序索引的功能,MySQL是从8.0才开始支持。 MySQL 5.7中,我们创建了一张测试表t1,包含两个字段c1和c2,插入一些数据,如下所示, mysql> create table t1(c1 varchar(1), c2 int); Query OK, 0 rows affected (0.32 sec)
> CREATE TABLE names(name STRING COLLATE UNICODE_CI); -- Create an external table connected to Oracle > CREATE TABLE IF NOT EXISTS ora_tab USING ORACLE OPTIONS ( url '<jdbc-url>', dbtable '', user '<username>', password '<password>' ); > SELECT * FROM ora_tab; 相關文章A...
To ensure performance and facilitate maintenance, we recommend that you specify a primary key or a unique key when you create a table. If no existing field can be used as the primary key, you can add a numeric column as the primary key, and use the Sequence object of the Oracle tenant...
CREATE FOREIGN TABLE creates an HDFS or OBS foreign table in the current database to access structured data stored on HDFS or OBS. You can also export data in ORC format to HDFS or OBS. Data stored in OBS: Data storage is decoupled from compute. The cluster storage cost is low, and st...
SELECT partition_name, high_value from ALL_TAB_PARTITIONS; partition_name | high_value ---+--- americas | 'US', 'CANADA' asia | 'INDIA', 'PAKISTAN' europe | 'FRANCE', 'ITALY' (3 rows) Country列中带有US或CANADA值的记录存储于americas分区中。 Country列中带有INDIA 或 PAKISTAN值的记录...