Update strategy in Update Strategy transformation can be set at which different levels

The Update Strategy transformation in Informatica allows update strategy settings at both the Mapping level (default strategy for all rows) and the Session level (override or additional settings). At the Mapping level, you can set a default update strategy expression. At the Session level, you can configure properties like 'Treat source rows as' (Insert, Delete, Update, or Data Driven) and override mapping-level settings if needed.