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A GIS data administrator frequently changes the map based on definition queries. A noticeable lag occurs when changing the parameter value of the definition query. Which action should be taken?
Correct Answer: A
Scenario Overview: * The GIS data administrator is experiencinglagwhen changing the parameter value of adefinition query. * Definition queries dynamically filter data based on attribute values. Slow performance often indicates inefficient attribute searches. Solution: Add Attribute Index * Anattribute indexallows the database to quickly locate rows based on values in the indexed column, significantly improving query performance. * When definition queries rely on non-indexed fields, the database must scan the entire dataset to filter records, leading to noticeable delays. * By creating an attribute index on the fields used in the definition query, the database can optimize filtering, reducing lag.(ArcGIS Documentation: Attribute Indexes) Steps to Add Attribute Index: * In ArcGIS Pro, open theAttribute Indexestool. * Select thefeature class or tableused in the definition query. * Specify the field(s) that the definition query is based on. * ClickRunto create the index. Alternative Options: * Option B: Add Spatial Index * Spatial indexes optimize spatial queries (e.g., finding features within an area). This does not address attribute-based definition query lag. * Option C: Recalculate Extent * Recalculating the extent corrects boundary discrepancies in spatial datasets but has no impact on attribute query performance. Thus, adding anattribute indexis the correct action to resolve lag in definition queries.
