What is the method for restricting BigQuery job through slots?

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To restrict BigQuery job through slots, you can use the following method:

1. Create a new BigQuery reservation that specifies the number of slots you want to allocate to your jobs.

2. Assign your BigQuery jobs to the reservation by specifying the reservation name in your job configuration.

3. Monitor your job usage and adjust your reservation size as needed to ensure that you have the resources you need.

Note that you can also use the BigQuery API to manage reservations and job slots programmatically.