Range Partitioning

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Materials

Let us understand how we can take care of range partitioning of tables.

  • It is primarily used to create partitions based up on a given range of values.

  • Here are the steps involved in creating table using range partitioning strategy.

    • Create table using PARTITION BY RANGE

    • Add default and range specific partitions

    • Validate by inserting data into the table

  • We can detach as well as drop the partitions from the table.

Create Partitioned Table

Let us create partitioned table with name users_range_part.

  • It contains same columns as users.

  • We will partition the table based up on created_dt field.

  • We will create one partition per year with naming convention users_range_part_yyyy (users_range_part_2016).

%load_ext sql

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The sql extension is already loaded. To reload it, use:
  %reload_ext sql

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%env DATABASE_URL=postgresql://itversity_sms_user:sms_password@localhost:5432/itversity_sms_db

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env: DATABASE_URL=postgresql://itversity_sms_user:sms_password@localhost:5432/itversity_sms_db

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%sql DROP TABLE IF EXISTS users_range_part

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 * postgresql://itversity_sms_user:***@localhost:5432/itversity_sms_db
Done.

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%%sql

CREATE TABLE users_range_part (
    user_id SERIAL,
    user_first_name VARCHAR(30) NOT NULL,
    user_last_name VARCHAR(30) NOT NULL,
    user_email_id VARCHAR(50) NOT NULL,
    user_email_validated BOOLEAN DEFAULT FALSE,
    user_password VARCHAR(200),
    user_role VARCHAR(1) NOT NULL DEFAULT 'U', --U and A
    is_active BOOLEAN DEFAULT FALSE,
    created_dt DATE DEFAULT CURRENT_DATE,
    last_updated_ts TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (created_dt, user_id)
) PARTITION BY RANGE(created_dt)

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 * postgresql://itversity_sms_user:***@localhost:5432/itversity_sms_db
Done.

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Note

We will not be able to insert the data until we add at least one partition.