Object Limits
You can access the Object Limits page when planning how to customize a particular object, or to monitor the current usage and limits, such as the number of custom fields or rules applied.
Object Limits for standard objects
To access the standard Object Limits page, navigate to Setup | Customize. Click on the name of the desired standard object, and then click on the limits, as shown in the following screenshot (for the Account
object):
Here, you can see usage details for the following: Custom Fields, Rollup Summary Fields, Custom Relationship Fields, Active Workflow Rules, Total Workflow Rules, Approval Processes, Active Lookup Filters, Active Validation Rules, VLOOKUP Functions, Sharing Rules (Both Owner-and Criteria-based), and Sharing Rules (Criteria-based Only).
Object Limits for custom objects
To view information about the usage of various fields and rules that have been created on a custom object, you can access the Object Limits window displayed on a custom object definitions...