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"Updating" records to cause trigger to fire
Hi everyone - I have a set of about 13,000 records for which I want to update a field using a trigger that I've recently deployed. Are their any best practices that dictate the best way to "update" that many records?
If your trigger code is written in such a way to handle bulk operations ,you can update any number of records in one call .
Anyway default batch size is 200 for trigger.
Please look into below link to bulkify your code if it is not.
https://developer.salesforce.com/page/Best_Practice%3A_Bulkify_Your_Code
Let us know if it helps you.