But we can implement a solution where we pre-create the list partitions and the required hash sub-partitions on PostgreSQL. PostgreSQL in general can’t create list partitions automatically. Let’s implement similar behavior on Amazon RDS for PostgreSQL or Aurora PostgreSQL. SQL> select PARTITION_NAME,SUBPARTITION_NAME from dba_tab_subpartitions where TABLE_OWNER='TEST' and TABLE_NAME='ORDERS' SQL> insert into test.orders values (101,'OFFICE','Chair',current_date) SQL> insert into test.orders values (100,'HOME','Vase',current_date) Test.orders_p2022_09 FOR VALUES FROM (' 00:00:00') TO (' 00:00:00'),Īfter the main table is in place, we must create a partition configuration in the partman schema as this will let you define the retention period for created partitions: Quantity_sold | integer | | | | plain | |Īmount_sold | numeric(10,2) | | | | main | | Purchase_time | timestamp with time zone | | | | plain | | SELECT partman.create_parent( p_parent_table => 'test.orders',Ĭolumn | Type | Collation | Nullable | Default | Storage | Stats target | Description The following is the equivalent DDL that we used for the main table: SQL> select PARTITION_NAME,HIGH_VALUE from dba_tab_partitions where TABLE_OWNER='TEST' and TABLE_NAME='ORDERS' The DDL for this table on Oracle is as follows: We have a table called ORDERS in the TEST schema in our Oracle database, which is partitioned by range, and the partitioning is taken care of by Oracle automatically. Use case 1: Migrate a range-partitioned table with automatic partition creation We discuss four use cases and a few recent improvements in Amazon RDS for PostgreSQL and Aurora PostgreSQL table partitioning that can help you design a better partition strategy while migrating from Oracle. In this post, we focus on setting up PostgreSQL database schemas by converting a few key partition and sub-partition types. You can create indexes, triggers, and constraints on each individual partition and also on all partitions together. You can also use multilevel partitions, which can go to the n th – level partitions based on your needs. PostgreSQL declarative partitioning is a flexible way to manage your partition tables and their subsequent sub-partitions. One among them is converting Oracle schemas with partitioned (and sub-partitioned) tables to PostgreSQL-compatible partitioned tables. Most heterogeneous database migrations present unique challenges. Organizations are looking to migrate on-premises Oracle database workloads to Amazon Relational Database Service (Amazon RDS) for PostgreSQL or Amazon Aurora PostgreSQL-Compatible Edition.
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