PMC-OAI Service查詢限制

http://www.pubmedcentral.nih.gov/oai/oai.cgi.

High-Volume Retrievals

If you are using a script that makes more than 100 requests of any kind, please run it outside of the PMC system's peak hours. Do not make more than one request every 3 seconds, even at off-peak times. Peak hours are Monday to Friday, 5:00 AM to 9:00 PM, U.S. Eastern time.

大量查詢: 超過100次要求，應利用離峰時間
(週一到五5:00~21:00USE)
即使在離峰時間，3秒內也不可超過一次要求