What is the method for creating table partitions in Oracle?

2 years ago
Sophia Anderson
2 minutes

There are two methods for creating table partitions in Oracle: manual partitioning and automatic partitioning.

  1. Manual partitioning: By utilizing the manual partitioning method, it is necessary to explicitly specify the number of partitions and partition keys when creating a table. The partition keys can be one or more columns in the table, used to distribute data into different partitions based on specific value ranges. For instance, partitioning can be done based on time ranges, geographic locations, or other business requirements.

Here is an example of manual partition syntax when creating a table:

CREATE TABLE table_name (
    column1 data_type,
    column2 data_type,
    ...
) 
PARTITION BY RANGE (partition_key)
(
    PARTITION partition_name1 VALUES LESS THAN (value1),
    PARTITION partition_name2 VALUES LESS THAN (value2),
    ...
);
  1. Automatic partitioning: With the automatic partitioning method, Oracle will automatically create partitions based on predefined rules. This requires creating a partition template first, defining the partition key, partition strategy, and partition naming conventions. When creating a table, the partition template is used to specify the partitions.

Here is an example syntax for automatic partitioning when creating a table:

CREATE TABLE table_name (
    column1 data_type,
    column2 data_type,
    ...
) 
PARTITION BY RANGE (partition_key)
SUBPARTITION BY HASH (subpartition_key)
SUBPARTITIONS 4
STORE IN (tablespace_name)
(
    PARTITION BY RANGE (partition_key) INTERVAL (interval_value)
    (
        SUBPARTITION partition_name1 VALUES LESS THAN (value1),
        SUBPARTITION partition_name2 VALUES LESS THAN (value2),
        ...
    )
);

Note: Automatic partitioning requires partitioning to be enabled in the database and support for partitioned tablespaces.

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