#Oracle database partitioning how to

Partition p4 values ('LONDON','CHICAGO')) Partition p2 values ('ASANSOL','JAMSHEDPUR'), (Partition p1 values ('NEWDELHI','LUCKNOW'), Let us prepare the query for the same.Д¬REATE table employee_database (employee_id number (5), employee_name varchar2(20),City varchar2(20)) In this example, we are going to create a partition table employee_database with three columns. In this section, we are going to discuss the concept of list partition to create a table. Example #3 вЂ“ Using List Partition to Create a Table In the above query, the partitioning column is product_id and p1, p2, p3, p4 are the tablespaces for the four partitions to store the respective values.ДЄs we can see in the screenshot above the table has been created successfully. Let us look at the query below.Д¬REATE TABLE product(product_id NUMBER(4), description VARCHAR2 (100)) In this example, we will create a table product with two columns.

Example #2 вЂ“ Using Partition by Hash to Create a Table Let execute the query in and check the result.ДЄs we can see in the screenshot above the query displays the details.

SELECT * FROM USER_TAB_PARTITIONS WHERE TABLE_NAME = 'SALE_PRODUCT' Let us now check the partition details along with the partition name, position, and other details. Now let us check the table data after insert.ДЄs we can see in the screenshot that four rows have been inserted. Let us execute the query in the developer and check the result.ДЄs we can see in the screenshot the data has been inserted. INSERT INTO sale_product (year, product_name, amount) VALUES ('2005', 'cycle', 4000) INSERT INTO sale_product (year, product_name, amount) VALUES ('2004', 'bike', 40000) INSERT INTO sale_product (year, product_name, amount) VALUES ('2003', 'truck', 1500000) INSERT INTO sale_product (year, product_name, amount) VALUES ('2002', 'car', 400000) So we will insert four rows of data into the table using the INSERT statement. Let us now insert data into the table and check. INSERTING DATA INTO THE PARTITIONED TABLE: Let us execute the query and check the result.ДЄs per the screenshot above, we can see that the table sale_product has been created. The partition p1 is used to store the rows of the year 2002, similarly, partition p2 will store rows of the year 2003, partition p3 will store the rows of the year 2004 and the rest of the rows are stored in partition p4. In the above query, we can see that there are four partitions. Partition p4 values less than(maxvalue)) Let us look at the query for the same.Д¬REATE table sale_product (year number(4),product_name varchar2(10), amount number(10)) In this section, we are going to create a table using the partition by range concept. Let us now look into a few examples so that we can get a better understanding of the concept.Д®xamples #1 вЂ“ Using Partition by Range to Create a Table Composite partition: As the name suggests it is a type of partition where we are using the range method for partition and then we are using the hash method for subpartition.In this way, it is different from range partition because in range partition a range of values is associated with partition whereas we can ourselves specify the list of values for the partition column.

We can use more than one column as a partition key. In list partition, the partition is defined by a discrete list of values.

List partition: This type of partition is completely different from the other two partitions.

Hash partition is also used as an alternative to range partition. The mapping of rows is based on the hash value of the partition key.

Hash Partition: it is used to evenly distribute data across all the partitions that are defined.

It is one of the most common ways of doing partition. It maps data based on the ranges of values of the partitioning key and the range is already established for each partition and based on that the values are stored in each partition.

Range Partition: This type of partition is used when data is distributed over a range of values.

Let us now discuss each one of them below. To do this there are four ways in which we can do partition in Oracle.

#Oracle database partitioning how to

In this section, we are going to discuss how to perform table partition in Oracle. In the previous section, we discussed the definition of table partition. How to Perform Table Partition in Oracle? Table_name: It refers to the name of the table we want to createД¬olumn_1 datatype, column_2 datatype, вЂ¦, column_n datatype: These refer to the name of the columns and their data typesД¬olumn: It refers to the column name based on which you will create the partition. вЂ¦partition pN values condition) Parameters Hadoop, Data Science, Statistics & othersД¬reate table table_name(column_1 datatype

2022.03

Oracle database partitioning