From WooCommerce 8.2, released on October 2023, HPOS is enabled by default for new installations. Existing stores can switch to the "High-Performance Order Storage" from "WordPress Posts Storage" by following the below steps.
To activate High-Performance Order Storage, existing stores will firs t need to get both the posts and orders table in sync, which can be done by turning on the setting "**Enable compatibility mode (synchronizes orders to the posts table)**".
- The action `wc_schedule_pending_batch_process` checks whether there are orders that need to be backfilled.
- If there are, it schedules another action `wc_run_batch_process` that actually backfills the orders to post storage.
- You can either wait for these actions to run on their own, which should be quite soon, or you can go to **WooCommerce > Status > Scheduled Actions**, find the actions and click on the run button.
- The action will backfill 25 orders at a time, if there are more orders to be synced, then more actions will be scheduled as soon as the previous actions are completed.
- It is advisable to maintain compatibility mode for some time to ensure a seamless transition. In case of any issues, reverting to the post table can be done instantly.
