You can opt to use the the "alternate database" identified in the Reports Database field of the Data-Admin-DB-Table instance that supports the Applies To class of a report as the source for the report. This reduces the load on the database that serves your application when you run the report.
BIX performance improvements for CSV output in the Pega Cloud
Valid from Pega Version 7.2.1
BIX performance has been enhanced to download up to 25 GB of data per hour for extracts from a BLOB-less class table for CSV output. This high-throughput option is available only for Pega Cloud instances that use a Postgres database. This option is used automatically for these types of extracts.
When this option is used, the –x and –c command-line options for BIX are not supported, and the checkSum field in the manifest summary is not populated. If you need these options, you can revert to the previous implementation by using a setting in the prconfig.xml file.