How can a regular table in DB2 be converted into a partitioned table?

2 years ago
Noah Thompson
2 minutes

To convert a regular table into a partitioned table, the following steps need to be performed:

  1. Create a new table structure for a partitioned table: use the CREATE TABLE statement to create a new partitioned table, including the partition column and partition definitions. For example:
CREATE TABLE partitioned_table (
    id INT,
    name VARCHAR(50),
    age INT,
    partition_column DATE
)
PARTITION BY RANGE (partition_column)(
    STARTING '2022-01-01' ENDING '2023-12-31' EVERY 1 MONTH
)
  1. Migrate data from the old table to the new table: Use the INSERT INTO SELECT statement to insert data from the old table into the new partitioned table. For example:
INSERT INTO partitioned_table (id, name, age, partition_column)
SELECT id, name, age, partition_column
FROM old_table
  1. Delete the old table and rename the new table: Use the DROP TABLE statement to delete the old table, then use the RENAME TABLE statement to rename the new table with the name of the old table. For example:
DROP TABLE old_table
RENAME TABLE partitioned_table TO old_table

Please note that converting a regular table to a partitioned table may require additional steps such as adjusting indexes, recreating triggers, etc., to fit the new table structure. Furthermore, the partitioning strategy and performance impact of the partitioned table should also be taken into consideration. It is recommended to backup data before performing this operation and validate it in a testing environment.

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