Bulkification means processing collections of records rather than assuming a trigger receives one record. Queries and DML inside per-record loops can exhaust transaction limits.
Before you begin
Use an authorized development or training organization with fictional records. Record the object names, permissions and configuration used so that someone else can reproduce the exercise.
Work through the idea
First describe the business requirement and the records involved. Keep the exercise separate from a live organization's data and change process. Platform behavior can depend on permissions and configuration; verify those conditions rather than assuming an administrator's result applies to every user.
- Collect record IDs before querying
- Use maps to relate parents and children
- Perform collection DML after building the result
Practice task
Design an Account update that recalculates a field on related Contacts for several Accounts in one transaction.
Check your result
Show a one-record case, a mixed collection and an empty related-record set; inspect query and DML counts.
A mistake to avoid
Do not solve a bulk problem by increasing a loop limit or swallowing exceptions.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
Official reference for further study
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