Skinny Table
Salesforce can create skinny tables to contain frequently used fields and to avoid joins, and it keeps the skinny tables in sync with their source tables when the source tables are modified. If you want to use skinny tables, contact Salesforce Customer Support. Skinny tables can be created on custom objects, and on Account, Contact, Opportunity, Lead, and Case objects. In addition, they can enhance performance for reports, list views, and SOQL.
For each object table, Salesforce maintains other, separate tables at the database level for standard and custom fields. This separation ordinarily requires a join when a query contains both kinds of fields. A skinny table contains both kinds of fields and does not include soft-deleted records.
This table shows an Account view, a corresponding database table, and a skinny table that would speed up Account queries.
