Using PostgreSQL extensions with Amazon RDS for PostgreSQL

You can extend the functionality of PostgreSQL by installing a variety of extensions and modules. For example, to work with spatial data you can install and use the PostGIS extension. For more information, see Managing spatial data with the PostGIS extension. As another example, if you want to improve data entry for very large tables, you can consider partitioning your data by using the pg_partman extension. To learn more, see Managing PostgreSQL partitions with the pg_partman extension.

Note

RDS for PostgreSQL supports Trusted Language Extensions for PostgreSQL through the pg_tle extension, which you can add to your DB instance. By using this extension, developers can create their own PostgreSQL extensions in a safe environment that simplifies the setup and configuration requirements. To learn about RDS for PostgreSQL versions supporting pg_tle extension and for more information, see Working with Trusted Language Extensions for PostgreSQL.

In some cases, rather than installing an extension, you might add a specific module to the list of shared_preload_libraries in your RDS for PostgreSQL DB instance's custom DB parameter group. Typically, the default DB cluster parameter group loads only the pg_stat_statements, but several other modules are available to add to the list. For example, you can add scheduling capability by adding the pg_cron module, as detailed in Scheduling maintenance with the PostgreSQL pg_cron extension. As another example, you can log query execution plans by loading the auto_explain module. To learn more, see Logging execution plans of queries in the AWS knowledge center.

Depending on your version of RDS for PostgreSQL, installing an extension might require rds_superuser permissions, as follows:

• For RDS for PostgreSQL versions 12 and earlier versions, installing extensions requires rds_superuser privileges.

• For RDS for PostgreSQL version 13 and higher versions, users (roles) with create permissions on a given database instance can install and use any trusted extensions. For a list of trusted extensions, see PostgreSQL trusted extensions.

You can also specify precisely which extensions can be installed on your RDS for PostgreSQL DB instance, by listing them in the rds.allowed_extensions parameter. For more information, see Restricting installation of PostgreSQL extensions.

To learn more about the rds_superuser role, see Understanding PostgreSQL roles and permissions.

Topics

• Using functions from the orafce extension

• Using Amazon RDS delegated extension support for PostgreSQL

• Managing PostgreSQL partitions with the pg_partman extension

• Using pgAudit to log database activity

• Scheduling maintenance with the PostgreSQL pg_cron extension

• Using pglogical to synchronize data across instances

• Using pgactive to support active-active replication

• Reducing bloat in tables and indexes with the pg_repack extension

• Upgrading and using the PLV8 extension

• Using PL/Rust to write PostgreSQL functions in the Rust language

• Managing spatial data with the PostGIS extension