EARLY_MATERIALIZATION

Specifies early materialization of a table for the current query. A query can include this hint for any number of tables. Typically, the query optimizer delays materialization until late in the query execution process. This hint overrides any choices that the optimizer otherwise would make.

This hint can be useful in cases where late materialization of join inputs precludes other optimizations—for example, pushing aggregation down the joins, or using live aggregate projections. In these cases, qualifying a join input with EARLY_MATERIALIZATION can enable the optimizations.

Syntax

table-name [ [AS] alias ] /*+EARLY_MATERIALIZATION*/