This topic describes the limits in ActionTrail.

Item Upper limit
Number of trails that can be created by an Alibaba Cloud account in each region 5
Number of Object Storage Service (OSS) buckets that can be configured for a trail 1
Waiting time to query an event by using the Alibaba Cloud Management Console after the event occurs 10 minutes
Waiting time to query an event in the OSS bucket after the event occurs 10 minutes
Number of days that events are retained for query by using the Alibaba Cloud Management Console or calling API operations
Note By default, ActionTrail allows you to query the events that were recorded within your Alibaba Cloud account in the last 90 days. If you do not create a trail, you cannot query the events that occurred 90 days ago.
90 days
Number of times that historical events delivered by a single-account trail can be queried per second by using the Alibaba Cloud Management Console or calling the LookupEvents operation 2
Size of a compressed log file that is used to store delivered events in an OSS bucket 2 KB