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Target customers: ApsaraDB RDS for PostgreSQL users. Features released: The oss_fdw plug_in for ApsaraDB RDS for PostgreSQL 11 has been released to separate cold data from hot data. Cold data is stored in OSS to expand the storage capacity of PostgreSQL databases. 1. OSS provides unlimited storage space. Cold data is stored in OSS to save storage costs and expand the storage capacity of PostgreSQL databases. 2. An ApsaraDB RDS for PostgreSQL database can be used as the data center of an extract, transform, and load (ETL) process when you use OSS to import data from multiple data sources into the database.