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Apex managed sharing limits?
I've implemented a User Managed Sharing Using Apex and need to know are there any limits for Apex User Managed Sharing for standard or for custom objects?
You need to keep Governor Limits in the mind while doing the sharing via apex.
Below is the reference for governor limits and sample example.
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_gov_limits.htm
https://blog.jeffdouglas.com/2009/11/25/programmatically-creating-sharing-rules-with-apex/
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_bulk_sharing.htm
Hope above information was helpful.
Please mark as Best Answer so that it can help others in the future.
Thanks,
Vinay Kumar